TOHOKU UNIVERSITY Researchers - Toshiyuki Hashida

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Toshiyuki Hashida

Section

New Industry Creation Hatchery Center

Job title

Specially Appointed Professor(Research)

Degree

工学博士（東北大学）

researchmap

https://researchmap.jp/read0211533

J-GLOBAL ID

200901028029549966

Research History 8

2023/04 - Present

Tohoku University　New Industry Creation Hatchery Center　Specially Appointed Professor
1999/04 - 2023/03

東北大学教授（工学研究科）大学院重点化による配置換
1998/06 - 1999/03

東北大学教授（工学部）
1991/01 - 1998/05

東北大学助教授（工学部）
1991/04 - 1992/09

米国ミシガン大学客員研究員
1989/04 - 1990/12

東北大学講師（工学部）
1985/04 - 1989/03

東北大学助手（工学部）
1986/12 - 1987/03

航空宇宙技術研究所客員研究員

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Education 2

東北大学大学院　Graduate School, Division of Engineering　機械工学

- 1985/03/26
Tohoku University　Faculty of Engineering

- 1980/03

Committee Memberships 58

日本ファインセラミックス協会「固体酸化物形燃料電池セル用セラミックス材料の特性試験方法」委員会　委員

2011/04 - Present
日本ファインセラミックス協会「固体酸化物形燃料電池セル用セラミックス材料の特性試験方法」委員会　委員

2011/04 - Present
財団法人大阪科学技術センター付属ニューマテリアルセンター耐熱コーティングの特性評価試験法の標準化本委員会　委員

2006/04 - Present
財団法人大阪科学技術センター付属ニューマテリアルセンター耐熱コーティングの特性評価試験法の標準化本委員会　委員

2006/04 - Present
The ISRM Committee on Core-based Mode II Fracture Toughness Testing Methods　Working Group Organizer

2005/04 - Present
The ISRM Committee on Core-based Mode II Fracture Toughness Testing Methods　作業部会委員長

2005/04 - Present
The ASTM Subcommittee on Advanced Ceramics Applications　Scientific Committee Member

2004/12 - Present
The ASTM Subcommittee on Advanced Ceramics Applications　技術委員会委員

2004/12 - Present
日本機械学会（年次大会燃料電池・二次電池とナノ・マイクロ現象セッション）　セッションオーガナイザー

2021/09 - 2021/09
一般社団法人日本ファインセラミックス協会新エネルギー等国際標準開発平成２７年度「固体酸化物形燃料電池セル用セラミックス材料の界面強度に関する国際標準化」委員会　界面強度評価試験法委員会（WG1）委員

2017/04 - 2018/02
一般社団法人日本ファインセラミックス協会新エネルギー等国際標準開発平成２７年度「固体酸化物形燃料電池セル用セラミックス材料の界面強度に関する国際標準化」委員会　界面強度評価試験法委員会（WG1）委員

2017/04 - 2018/02
一般社団法人日本ファインセラミックス協会新エネルギー等国際標準開発平成２７年度「固体酸化物形燃料電池セル用セラミックス材料の界面強度に関する国際標準化」委員会　界面強度評価試験法委員会（WG1）委員

2016/04 - 2017/02
一般社団法人日本ファインセラミックス協会新エネルギー等国際標準開発平成２７年度「固体酸化物形燃料電池セル用セラミックス材料の界面強度に関する国際標準化」委員会　界面強度評価試験法委員会（WG1）委員

2016/04 - 2017/02
一般社団法人日本ファインセラミックス協会新エネルギー等国際標準開発平成２７年度「固体酸化物形燃料電池セル用セラミックス材料の界面強度に関する国際標準化」委員会　界面強度評価試験法委員会（WG1）委員

2015/05 - 2016/02
一般社団法人日本ファインセラミックス協会新エネルギー等国際標準開発平成２７年度「固体酸化物形燃料電池セル用セラミックス材料の界面強度に関する国際標準化」委員会　界面強度評価試験法委員会（WG1）委員

2015/05 - 2016/02
一般社団法人日本ファインセラミックス協会新エネルギー等共通基盤整備促進事業平成２５年度「新エネルギー等の基盤整備に係る技術開発／燃料電池のシステム及びセル用材料の品質評価手法・特性評価方法・基準の開発」委員会　強度試験方法WG委員

2013/09 - 2014/03
一般社団法人日本ファインセラミックス協会新エネルギー等共通基盤整備促進事業平成２５年度「新エネルギー等の基盤整備に係る技術開発／燃料電池のシステム及びセル用材料の品質評価手法・特性評価方法・基準の開発」委員会　強度試験方法WG委員

2013/09 - 2014/03
日本機械学会　校閲委員

2012/04 - 2013/03
日本機械学会　校閲委員

2012/04 - 2013/03
日本機械学会論文集編集委員会（第８９期）　校閲委員

2011/04 - 2012/03
日本機械学会論文集編集委員会（第８９期）　校閲委員

2011/04 - 2012/03
日本機械学会　日本機械学会第８７期評議員

2009/04 - 2010/03
日本機械学会　日本機械学会第８７期評議員

2009/04 - 2010/03
日本機械学会東北支部　日本機械学会東北支部第４５期商議員

2008/04 - 2009/03
The 10th International Symposium on Multiscale, Multifunctional and Functionally Graded Materials, Organized by Functionally Graded Materials Forum/Japan　organizing committe member

2008/04 - 2009/03
日本機械学会東北支部　日本機械学会東北支部第４５期商議員

2008/04 - 2009/03
The 10th International Symposium on Multiscale, Multifunctional and Functionally Graded Materials, Organized by Functionally Graded Materials Forum/Japan　organizing committe member

2008/04 - 2009/03
日本鉄鋼協会学会部門学術部会社会鉄鋼工学部会「水熱合成による製鉄プロセス副生物の利材化研究会」　委員

2004/04 - 2008/03
日本鉄鋼協会学会部門学術部会社会鉄鋼工学部会「水熱合成による製鉄プロセス副生物の利材化研究会」　委員

2004/04 - 2008/03
日本学術振興会特別研究員等審査会　専門委員

2004/08 - 2007/07
日本学術振興会特別研究員等審査会　専門委員

2004/08 - 2007/07
日本機械学会第84期論文集編集委員会　校閲委員

2006/04 - 2007/03
日本機械学会第84期論文集編集委員会　校閲委員

2006/04 - 2007/03
日本学術振興会特別研究員等審査会　専門委員

2004/08 - 2006/07
日本学術振興会特別研究員等審査会　専門委員

2004/08 - 2006/07
日本機械学会第83期論文集編集委員会　校閲委員

2005/04 - 2006/03
日本機械学会第83期論文集編集委員会　校閲委員

2005/04 - 2006/03
日本機械学会東北支部　第40期商議員

2004/03 - 2005/02
日本機械学会東北支部　第40期商議員

2004/03 - 2005/02
Fifth International Conference on Fracture Mechanics for Concrete Structures (Vail, Colorado April 12-16, 2004)　Advisory Board Committee Member

2003/03 - 2004/05
Fifth International Conference on Fracture Mechanics for Concrete Structures (Vail, Colorado April 12-16, 2004)　アドバイザリー委員会委員

2003/03 - 2004/05
日本機械学会材料力学部門　第81期運営委員

2003/04 - 2004/03
日本機械学会材料力学部門　第81期運営委員

2003/04 - 2004/03
新エネルギー・産業技術総合研究機構　技術委員

2002/09 - 2004/03
新エネルギー・産業技術総合研究機構　技術委員

2002/09 - 2004/03
The Japan Society of Mechanical Engineers　Techinical Committee (Publication) Chairman

2002/04 - 2004/03
日本機械学会第80および第81期材料力学部門　第9技術委員会（年鑑・出版）委員長

2002/04 - 2004/03
日本機械学会第80期論文集編集委員会　校閲委員

2002/04 - 2003/03
日本機械学会第80期論文集編集委員会　校閲委員

2002/04 - 2003/03
２０１３年度日本機械学会年次大会　セッションオーガナイザー

2013/09 -
２０１３年度日本機械学会年次大会　座長

2013/09 -
２０１３年度日本機械学会年次大会　セッションオーガナイザー

2013/09 -
２０１３年度日本機械学会年次大会　座長

2013/09 -
２０１２年度日本機械学会年次大会　セッションオーガナイザー

2012/09 -
２０１２年度日本機械学会年次大会　座長

2012/09 -
２０１２年度日本機械学会年次大会　セッションオーガナイザー

2012/09 -
２０１２年度日本機械学会年次大会　座長

2012/09 -
日本ファインセラミックス協会　「固体酸化物形燃料電池セル用セラミックス材料の弾性率試験方法と構造評価法に関する国際標準化」ワーキンググループ委員

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Professional Memberships 5

日本MRS
日本セラミックス協会
日本地熱学会
日本資源・素材学会
日本機械学会

Research Interests 5

複合材料
エネルギー変換機器
地熱エネルギー
破壊力学
材料強度学

Research Areas 1

Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Machine materials and mechanics /

Awards 13

High-Temperature Energy, Materials, & Processes Division Subhash Singhal Award

2023/05　The Electrochemical Society
2015 Journal of Materials Chemistry A Hot Paper

2015/03　Journal of Materials Chemistry A
日本粉末冶金工業会第７回PM研究促進展奨励賞

2009/10/27　日本粉末冶金工業会
Fellow of The Japan Society of Mechanical Engineers (JSME Fellow)

2007/03/22　日本機械学会
Best Paper Award

2006/11/10　Asian Symposium on Materials and Processing 2006 (ASMP 2006)　A New Method for Evaluating Degradation of Solid Oxide Fuel Cell Under Operating Conditions by Combining the Electrochemical Measurement with Non-destructive Test
Best Poster Award

2006/11/10　The Sixth Asian Bioceramics Symposium 2006 (ABC 2006)　Optimization of Reaction Time for Bonding Hydroxyapatite Ceramics and Titanium by Hydrothermal Hot-pressing
ポスター賞・ゴールド賞

2003/12/06　材料技術研究協会　SOFC用電解質の機械的特性および電気的特性評価に関する研究
傾斜機能材料に関する優秀研究提案

2003/03/15　航空宇宙技術振興財団　傾斜接合カーボンナノチューブバルク固化体の創成
GRC優秀論文賞

2001/09/26　Geothermal Resources Council　Fracture generation and water-rock interaction processes in supercritical Deep-Seated Geothermal Reservoirs
ASTM最優秀論文賞

2001/03/09　American Society for Testing and Materials　Development of Small Punch Tests for Creep Property Measurement of W Alloyed 9%Cr Ferritic Steels
Excellent treatise award on the Conference of Mechanics 2000

2000/08/24　The Chinese Society of Theoretical and Applied Mechanics　遮熱セラミックスコーティングの破壊プロセスに関する研究
Sigma Xi

1992/11/05　The Scientific Research Society, USA　短繊維複合による強靭化に関する研究
日本機械学会賞（奨励賞）

1991/04/01　日本機械学会　岩石破壊靭性評価に関する研究

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Papers 616

Mitigating fracture risks in solid oxide fuel cells: Study on temperature dependence of residual stress and optimal design strategy upon sintering process

Junya Tanaka, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Toshiyuki Hashida

Journal of Power Sources　641　2025/06/15

DOI： 10.1016/j.jpowsour.2025.236850 　

ISSN： 0378-7753
High-temperature in situ stress monitoring of a co-fired electrolyte for metal-supported solid oxide cells Peer-reviewed

Mina Yamaguchi, Takumi Komaya, Zaka Ruhma, Satoshi Watanabe, Keiji Yashiro, Keigo Kumada, Kazuhisa Sato, Toshiyuki Hashida, Itaru Oikawa, Hitoshi Takamura, Riyan Achmad Budiman, Tatsuya Kawada

Journal of Power Sources　630　236147-236147　2025/02
Publisher: Elsevier BV
DOI： 10.1016/j.jpowsour.2024.236147 　

ISSN： 0378-7753
Electronic role of biosemiconductors with C=O bonds Peer-reviewed

Mikio Fukuhara, Tomonori Yokotsuka, Tetsuo Samoto, Chika Saito, Nobuhisa Fujima, Toshiyuki Hashida

AIP Advances　15　(1)　2025/01/01
Publisher: AIP Publishing
DOI： 10.1063/5.0235319 　

eISSN： 2158-3226

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In this study, the electrical conducting properties of six types of biomaterials, comprising cellulose and chitosan derived from terrestrial plants and marine products, respectively, were investigated using electron spin resonance (ESR) and Schottky junction characteristics. Kenaf, chitosan, conifer, and RCH2OH (R = C11H17O9) exhibited ESR spectra showing unpaired electrons at 295 K, demonstrating rectifying effects at room temperature. In contrast, RCOONa (C12H17O11Na) and α-chitin, which did not exhibit observable ESR spectra, showed ohmic conduction behavior. The ESR g value was used to determine the organic radical species, suggesting that electrons originate from the glycosidic C1–O1•–C4 radical in cellulose and the aminyl N•–H radical in chitosan. RCOONa and α-chitin, which possess C=O bonds, suppress electron-induced effects and consequently inhibit the transport of free radicals, resulting in ohmic conduction.
High-energy density cellulose nanofibre supercapacitors enabled by pseudo-solid water molecules Peer-reviewed

Mikio Fukuhara, Tomonori Yokotsuka, Masahiro Morita, Tatsunori Ito, Minoru Yada, Takeshi Nakatani, Toshiyuki Hashida

Scientific Reports　14　(1)　2024/05/06
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-024-61128-w 　

eISSN： 2045-2322

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Abstract Compared with conventional electrochemical supercapacitors and lithium-ion batteries, the novel amorphous cellulose nanofibre (ACF) supercapacitor demonstrates superior electric storage capacity with a high-power density, owing to its fast-charging capability and high-voltage performance. This study unveils introduces an ACF supercapacitor characterised by a substantial energy density. This is achieved by integrating a singular layer of pseudo-solid water molecules (electrical resistivity of 1.11 × 10⁸ Ω cm) with cellulose nanofibers (CNFs), establishing forming an electric double layer at the electrode interface. The enhanced energy storage in these high-energy density capacitors (8.55 J/m²) is explicated through the polarisation of protons and lone pair electrons on oxygen atoms during water electrolysis, commencing at 1.23 V. Improvements in energy density are attainable through CNF density enhancements and charging-current optimisation. The proposed ACF supercapacitor offers substantial promise for integration into the power sources of flexible and renewable paper-based electronic devices.
Radical electron-induced cellulose-semiconductors

Mikio Fukuhara, Tomonori Yokotsuka, Tetsuo Samoto, Masahiko Kumadaki, Mitsuhiro Takeda, Toshiyuki Hashida

Scientific Reports　14　(1)　2024/04/15
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-024-59499-1 　

eISSN： 2045-2322

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Abstract Bio-semiconductors are expected to be similar to organic semiconductors; however, they have not been utilized in application yet. In this study, we show the origin of electron appearance, N- and S-type negative resistances, rectification, and switching effects of semiconductors with energy storage capacities of up to 418.5 mJ/m² using granulated amorphous kenaf cellulose particles (AKCPs). The radical electrons in AKCP at 295 K appear in cellulose via the glycosidic bond C₁–O₁^·–C₄. Hall effect measurements indicate an n–type semiconductor with a carrier concentration of 9.89 × 10¹⁵/cm³, which corresponds to a mobility of 10.66 cm²/Vs and an electric resistivity of 9.80 × 10² Ωcm at 298 K. The conduction mechanism in the kenaf tissue was modelled from AC impedance curves. The light and flexible cellulose-semiconductors may open up new avenues in soft electronics such as switching effect devices and bio-sensors, primarily because they are composed of renewable natural compounds.
Automated parameter estimation for geothermal reservoir modeling using machine learning Peer-reviewed

Anna Suzuki, Shuokun Shi, Taro Sakai, Ken-ichi Fukui, Shinya Onodera, Junichi Ishizaki, Toshiyuki Hashida

Renewable Energy　224　120243-120243　2024/04
Publisher: Elsevier BV
DOI： 10.1016/j.renene.2024.120243 　

ISSN： 0960-1481
n-type semiconductor with energy storage made from chitosan Peer-reviewed

Mikio Fukuhara, Tomonori Yokotsuka, Shunsuke Kayamori, Akira Isogai, Toshiyuki Hashida

AIP Advances　14　(3)　2024/03/01
Publisher: AIP Publishing
DOI： 10.1063/5.0188917 　

eISSN： 2158-3226

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Chitosan, obtained from crustaceans such as crabs and shrimp, has been mainly used in medicine; however, no studies on its use in electronic applications with semiconducting and large storage properties have been reported. Here, we report an n-type semiconducting biomaterial with energy storage properties of 694.4 mJ/m2 consisting of a chitosan nanofiber (ChNF) film with N-type negative resistance. The ChNF generates an alternative-current wave with a frequency of 7.8 MHz at a threshold voltage of 187 MV/m from a direct-current voltage source, with the switching effect of a third-order resistance change. This is due to the Gunn effect, caused by the repeated voltage-induced generation of a strong electric field domain (electric double layer) at the cathode and its disappearance at the anode of the ChNF device. Electron spin resonance spectral analysis showed that conducting electrons of the ChNF were identified as radicals on the aminyl radical, N·H. Paper electronics made from marine products are a great boon to a renewable society.
From Electrochemical to Mechanical Modeling of SOFCs and Their Experimental Validation Peer-reviewed

Tatsuya Kawada, Satoshi Watanabe, Riyan Achmad Budiman, Keiji Yashiro, Kazuhisa Sato, Toshiyuki Hashida, Yuta Kimura, Takashi Nakamura, Koji Amezawa, Masami Sato, Reika Nomura, Mayu Muramatsu, Kenjiro Terada, Masami Sato

ECS Transactions　111　(6)　35-46　2023/05/19
Publisher: The Electrochemical Society
DOI： 10.1149/11106.0035ecst 　

ISSN： 1938-5862

eISSN： 1938-6737

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Tohoku University has been conducting research on the mechanical reliability of SOFCs under the financial support by NEDO (New Energy and Industrial technology Development Organization, Japan). Both numerical and experimental approaches have been taken at various levels, from electrochemical to structural analyses. An in-house code, SIMUDEL, was developed to simulate oxygen potential distribution inside the constituent materials in order to account for the chemical strain in cell/stack analyses. Non-linear stress-strain behaviors and inelastic deformation of the materials were characterized to improve the accuracy of the simulation. Predicting actual cell behavior, however, is still difficult, as unexpected factors often remain for each specific case. It is thus important to have in-situ or operando tools to observe the behavior of cells, such as deformation and stress generation. For that purpose, laser profilometer and X-ray stress analyzer were employed with a specially designed cell holder. Methods for evaluating local current density was also proposed. Currently, we are developing a protocol for testing robustness of planar SOFCs. Severe condition tests will be performed, and the results will be analyzed with the above-mentioned simulation.
テラヘルツ波によるSOFC 内部微小欠陥評価技術 Peer-reviewed

佐藤一永, 橋田俊之

セラミックス　58　(2)　87-90　2023/05
Amorphous alumina supercapacitors with voltage-charging performance Peer-reviewed

Mikio Fukuhara, Tomonori Yokotsuka, Toshiyuki Hashida, Koji Yamaguchi, Nobuhisa Fujima

Europhysics Letters　141　(3)　36003-36003　2023/02/01
Publisher: IOP Publishing
DOI： 10.1209/0295-5075/acb2f5 　

ISSN： 0295-5075

eISSN： 1286-4854

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Abstract The electric storage effect of fast charging by voltage application for amorphous alumina (cAAO) supercapacitors fabricated using a crystalline aluminum alloy was investigated in terms of charging/discharging behaviors and AC impedance. The mechanism for the electrical storage of a cAAO supercapacitor was proposed based on the coupling of electrons on Al atoms and positively charged holes in Al vacancies, using an electric double-layer model containing an electrolyte with an electrical resistivity of 6.3 × 10⁵Ωcm. The supercapacitor demonstrated fast charging at a voltage application of up to 500 V.
A novel n-type semiconducting biomaterial

Mikio Fukuhara, Tomonori Yokotsuka, Toshiyuki Hashida, Fumio Ogawa, Tadashi Sakamoto, Mitsuhiro Takeda, Susumu Arai

Scientific Reports　12　(1)　2022/12/19
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-022-26582-4 　

eISSN： 2045-2322

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Abstract There has been no research conducted thus far on the semiconducting behaviour of biomaterials. In this study, we present an n-type semiconducting biomaterial composed of amorphous kenaf cellulose fibre (AKCF) paper with a voltage-controlled N-type negative resistance. The AKCF generates an alternating-current wave with a frequency of 40.6 MHz from a direct-current voltage source at its threshold voltage (electric field of 5.26 kV/m), which is accompanied by a switching effect with a four-order resistance change at 293 K. This effect is attributed to the voltage-induced occurrence of strong field domains (electric double layers) at the cathode and depletion at the anode of the AKCF device. The proposed AKCF material presents considerable potential for applications in flexible/paper electronic devices such as high frequency power sources and switching effect devices.
Deformation mechanism of Ni(O) –yttria-stabilized zirconia upon reduction and it s effect on cell stress evolution in solid oxide fuel cells Peer-reviewed

Junya Tanaka, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Toshiyuki Hashida

Journal of Power Sources　550　(1)　232116-232124　2022/12

DOI： 10.1016/j.jpowsour.2022.232116 　
Amorphous cellulose nanofiber supercapacitors with voltage-charging performance

Mikio Fukuhara, Tomonori Yokotsuka, Toshiyuki Hashida, Tamon Miwa, Nobuhisa Fujima, Masahiro Morita, Takeshi Nakatani, Fuminari Nonomura

Scientific Reports　12　(1)　2022/12
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-022-09649-0 　

eISSN： 2045-2322

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Abstract The electric charge storage properties of amorphous cellulose nanofiber (ACF) supercapacitors with different metal carboxylate radicals (COOM; M: Na(I), Ca(II), Al(III)) was investigated in terms of charging/discharging behaviours, alternating current impedance analysis, and plane-wave-based first-principles density functional calculations. Na-ACF exhibited a higher storage effect than Ca- and Al-ACFs. The charge storage mechanism for an Na-ACF supercapacitor was proposed using an electric double layer model in a C₁₂H₁₇O₁₁Na electrolyte with an electrical resistivity of 6.8 × 10³ Ω cm, based on the migration of protonic soliton. The supercapacitor, which demonstrated fast charging upon voltage application, could illuminate a white LED for 7 s after charging with 10 mA at 18.5 V.
Estimation of flow-channel structures with uncertainty quantification: Validation by 3D-printed fractures and field application

Anna Suzuki, Elvar K. Bjarkason, Aoi Yamaguchi, Adam J. Hawkins, Toshiyuki Hashida

Geothermics　105　102480-102480　2022/11
Publisher: Elsevier BV
DOI： 10.1016/j.geothermics.2022.102480 　

ISSN： 0375-6505
Effects of temperature and hydrogen concentration during reduction on deformation behavior of NiO- yttria stabilized zirconia used in solid oxide fuel cells

Junya Tanaka, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Toshiyuki Hashida

Journal of Power Sources　535　231384-231384　2022/07
Publisher: Elsevier BV
DOI： 10.1016/j.jpowsour.2022.231384 　

ISSN： 0378-7753
Data-Driven Geothermal Reservoir Modeling: Estimating Permeability Distributions by Machine Learning Peer-reviewed

Anna Suzuki, Ken-ichi Fukui, Shinya Onodera, Junichi Ishizaki, Toshiyuki Hashida

Geosciences　12　(3)　130-130　2022/03/11
Publisher: MDPI AG
DOI： 10.3390/geosciences12030130 　

eISSN： 2076-3263

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Numerical modeling for geothermal reservoir engineering is a crucial process to evaluate the performance of the reservoir and to develop strategies for the future development. The governing equations in the geothermal reservoir models consist of several constitutive parameters, and each parameter is given to a large number of simulation grids. Thus, the combinations of parameters we need to estimate are almost limitless. Although several inverse analysis algorithms have been developed, determining the constitutive parameters in the reservoir model is still a matter of trial-and-error estimation in actual practice, and is largely based on the experience of the analyst. There are several parameters which control the hydrothermal processes in the geothermal reservoir modeling. In this study, as an initial challenge, we focus on permeability, which is one of the most important parameters for the modeling. We propose a machine-learning-based method to estimate permeability distributions using measurable data. A large number of learning data were prepared by a geothermal reservoir simulator capable of calculating pressure and temperature distributions in the natural state with different permeability distributions. Several machine learning algorithms (i.e., linear regression, ridge regression, Lasso regression, support vector regression (SVR), multilayer perceptron (MLP), random forest, gradient boosting, and the k-nearest neighbor algorithm) were applied to learn the relationship between the permeability and the pressure and temperature distributions. By comparing the feature importance and the scores of estimations, random forest using pressure differences as feature variables provided the best estimation (the training score of 0.979 and the test score of 0.789). Since it was learned independently of the grids and locations, this model is expected to be generalized. It was also found that estimation is possible to some extent, even for different heat source conditions. This study is a successful demonstration of the first step in achieving the goal of new data-driven geothermal reservoir engineering, which will be developed and enhanced with the knowledge of information science.
Radial growth kinetics of epitaxial pyrolytic carbon layers deposited on carbon nanotube surfaces by non-catalytic pyrolysis Peer-reviewed

Fan Liu, Naoto Nishioka, Fumio Ogawa, Toshiyuki Hashida

Diamond & Related Materials　123　108857　2022/01
Epitaxial pyrolytic carbon coatings templated with defective carbon nanotube cores for structural annealing and tensile property improvement Peer-reviewed

Fan Liu, Keiichi Shirasu, Toshiyuki Hashida

Journal of Materials Science　2021/09/17
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s10853-021-06523-8 　

ISSN： 0022-2461

eISSN： 1573-4803
Effect of pinholes in electrolyte on re‐oxidation tolerance of anode‐supported solid oxide fuel cells Peer-reviewed

Keigo Kumada, Kazuhisa Sato, Tatsuya Kawada, Hirofumi Sumi, Hiroyuki Shimada, Toshiyuki Hashida

Fuel Cells　21　(4)　398-407　2021/08
Publisher: Wiley
DOI： 10.1002/fuce.202000062 　

ISSN： 1615-6846

eISSN： 1615-6854
Extension of Fracture Lifetime of Silicon Scanning Micromirror by Coating with Atomic Layer Deposited Alumina Thin Film Peer-reviewed

Yuuki Fujita, Takashi Sasaki, Kohichi Fukuda, Nguyen Thanh Tung, Fumio Ogawa, Toshiyuki Hashida, Kazuhiro Hane

Transducers 2021 Virtual Conference: Proc. of the 21st International Conference on Solid-State Sensors, Actuators and Microsystems　549-552　2021/06
Study on the mechanical and electrical properties of twisted CNT yarns fabricated from CNTs with various diameters Peer-reviewed

Yoku Inoue, Kohei Hayashi, Motoyuki Karita, Takayuki Nakano, Yoshinobu Shimamura, Keiichi Shirasu, Go Yamamoto, Toshiyuki Hashida

Carbon　176　400-410　2021/05
Publisher: Elsevier BV
DOI： 10.1016/j.carbon.2021.01.139 　

ISSN： 0008-6223
Ultrasonic properties of amorphous TEMPO-oxidized cellulose nanofibers Peer-reviewed

Mikio Fukuhara, Fumihiko Hasegawa, Toshiyuki Hashida

MRS Communications　2021/04/14
Publisher: Springer Science and Business Media LLC
DOI： 10.1557/s43579-021-00036-w 　

ISSN： 2159-6859

eISSN： 2159-6867
Molecular Dynamics Simulations and Theoretical Model for Engineering Tensile Properties of Single-and Multi-Walled Carbon Nanotubes Peer-reviewed

Keiichi Shirasu, Shunsuke Kitayama, Fan Liu, Go Yamamoto, Toshiyuki Hashida

Nanomaterials　11　(3)　795-795　2021/03/19
Publisher: MDPI AG
DOI： 10.3390/nano11030795 　

eISSN： 2079-4991

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To apply carbon nanotubes (CNTs) as reinforcing agents in next-generation composites, it is essential to improve their nominal strength. However, since it is difficult to completely remove the defects, the synthesis guideline for improving nominal strength is still unclear, i.e., the effective strength and the number of nanotube layers required to improve the nominal strength has been undermined. In this study, molecular dynamics simulations were used to elucidate the effects of vacancies on the mechanical properties of CNTs. Additionally, the relationships between the number of layers and effective and nominal strengths of CNTs were discussed theoretically. The presence of extensive vacancies provides a possible explanation for the low nominal strengths obtained in previous experimental measurements of CNTs. This study indicates that the nominal strength can be increased from the experimentally obtained values of 10 GPa to approximately 20 GPa by using six to nine nanotube layers, even if the increase in effective strength of each layer is small. This has advantages over double-walled CNTs, because the effective strength of such CNTs must be approximately 60 GPa to achieve a nominal strength of 20 GPa.
Amorphous cellulose nanofiber supercapacitors Peer-reviewed

Mikio Fukuhara, Tomoyuki Kuroda, Fumihiko Hasegawa, Toshiyuki Hashida, Mitsuhiro Takeda, Nobuhisa Fujima, Masahiro Morita, Takeshi Nakatani

Scientific Reports　11　(1)　2021/03/19
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-021-85901-3 　

eISSN： 2045-2322

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<title>Abstract</title>Despite the intense interest in cellulose nanofibers (CNFs) for biomedical and engineering applications, no research findings about the electrical energy storage of CNF have been reported yet. Here, we present the first electroadsorption effects of an amorphous cellulose nanofiber (ACF) supercapacitor, which can store a large amount of electricity (221 mJm⁻², 13.1 Wkg⁻¹). The electric storage can be attributed to the entirely enhanced electroadsorption owing to a quantum-size effect by convexity of 17.9 nm, an offset effect caused by positive polar C₆=O₆ radicles, and an electrostatic effect by appearance of the localised electrons near the Na ions. The supercapacitor also captures both positive and negative electricity from the atmosphere and in vacuum. The supercapacitor could illuminate a red LED for 1 s after charging it with 2 mA at 10 V. Further gains might be attained by integrating CNF specimens with a nano-electromechanical system (NEMS).
AlO6 clusters’ electric storage effect in amorphous alumina supercapacitors Peer-reviewed

Mikio Fukuhara, Tomoyuki Kuroda, Fumihiko Hasegawa, Toshiyuki Hashida, Mitsuhiro Takeda, Kazuya Konno, Nobuhisa Fujima

Scientific Reports　11　(1)　2021/01/18
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-021-81483-2 　

eISSN： 2045-2322

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<title>Abstract</title>In this study, the electric storage effect of AlO₆ clusters in amorphous alumina (AAO) supercapacitors was investigated in terms of cluster morphologies under electron-beam irradiation. Based on first-principles density functional calculation, the optimised structure of AlO₆ clusters around an O-vacancy is characterised by a large vacant space created by the absence of an O atom and its neighbouring Al atom. The localised electrons present near the two-atomic vacancies induce positive charges on the inside of the insulating oxide surface, ensuring the adsorption of many electrons on the surface. Electron-beam irradiation (adsorption) from 100 to 180 keV causes the lengths of the Al–O bonds of the cluster to shrink, but then return to the original length with decreasing voltage energy, indicating a rocking-chair-type charge-breathing effect accompanied by a volume expansion of approximately 4%. The <italic>I–V</italic> and <italic>I–R</italic> characteristics depicted Coulomb blockade for the switching effect of both the negative and positive potentials. The Ragone plot of the AAO supercapacitor is located at capability area of the second cell.
Development of dental inspection method: Nondestructive evaluation of an adhesive interface by ACTIVE acoustic emission Peer-reviewed

Ryoma Ezaki, Atsushi Mine, Kazuhisa Sato, Ken-ichi Fukui, Keigo Kumada, Masahiro Yumitate, Shintaro Ban, Azusa Yamanaka, Mariko Matsumoto, Bart Van Meerbeek, Hirokazu Moriya, Toshiyuki Hashida, Hirofumi Yatani

Journal of Prosthodontic Research　2021
Publisher: Japan Prosthodontic Society
DOI： 10.2186/jpr.jpr_d_20_00260 　

ISSN： 1883-1958

eISSN： 1883-9207

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PURPOSE: The state of adhesion between root dentin and a resin composite core material was inspected using acoustic emission (AE). METHODS: A total of 14 human incisors and premolars were used to prepare "no-adhesive group" and "adhesive group" specimens. For "adhesive group" specimens, a bonding agent was applied to root canal dentin. The entire post space was subsequently filled with a resin composite for both specimen groups. The prepared specimens were fixed onto a jig on which an AE sensor was installed. A zirconia ball was used for the impact test, and a vibration wave generated by the collision was measured by the system using an AE sensor. The obtained data were subjected to time-frequency analysis using analysis software (LabVIEW), and the relationship between the amplitude indicating the loudness and the frequency indicating the sound component was analyzed. RESULTS: Zirconia-ball collision tests using AE revealed differences between the groups with respect to the waveform of vibration waves transmitted to the root dentin through the root dentin-resin interface. The time-frequency analysis of the obtained data confirmed that multiple peaks were observed for each specimen in the no-adhesive group, whereas a single characteristic vibration peak was observed for all specimens in the adhesive group. CONCLUSIONS: The state of the adhesive interface was successfully evaluated by AE. This demonstration is expected to lead to the development of a device that can detect problems at the bonding interface between the prostheses and tooth substances.
Development of dental inspection method: nondestructive evaluation of a dentin–adhesive interface by acoustic emission Peer-reviewed

Ryoma Ezaki, Atsushi Mine, Kazuhisa Sato, Ken-ichi Fukui, Keigo Kumada, Masahiro Yumitate, Shintaro Ban, Azusa Yamanaka, Mariko Matsumoto, Bart Van Meerbeek, Toshiyuki Hashida, Hirofumi Yatani

Journal of Prosthodontic Research　2021
Publisher: Japan Prosthodontic Society
DOI： 10.2186/jpr.jpr_d_20_00135 　

ISSN： 1883-1958

eISSN： 1883-9207

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PURPOSE: The state of adhesion between root dentin and a resin composite core material was inspected using acoustic emission (AE). METHODS: A total of 14 human incisors and premolars were used to prepare "no-adhesive group" and "adhesive group" specimens. For "adhesive group" specimens, a bonding agent was applied to root canal dentin. The entire post space was subsequently filled with a resin composite for both specimen groups. The prepared specimens were fixed onto a jig on which an AE sensor was installed. A zirconia ball was used for the impact test, and a vibration wave generated by the collision was measured by the system using an AE sensor. The obtained data were subjected to time-frequency analysis using analysis software (LabVIEW), and the relationship between the amplitude indicating the loudness and the frequency indicating the sound component was analyzed. RESULTS: Zirconia-ball collision tests using AE revealed differences between the groups with respect to the waveform of vibration waves transmitted to the root dentin through the root dentin-resin interface. The time-frequency analysis of the obtained data confirmed that multiple peaks were observed for each specimen in the no-adhesive group, whereas a single characteristic vibration peak was observed for all specimens in the adhesive group. CONCLUSIONS: The state of the adhesive interface was successfully evaluated by AE. This demonstration is expected to lead to the development of a device that can detect problems at the bonding interface between the prostheses and tooth substances.
Liquid-Phase Assisted Engineering of Highly Strong SiC Composite Reinforced by Multiwalled Carbon Nanotubes

Yuchi Fan, Erhong Song, Tufail Mustafa, Ruicong Liu, Pengpeng Qiu, Weiwei Zhou, Zhenxing Zhou, Akira Kawasaki, Keiichi Shirasu, Toshiyuki Hashida, Jianjun Liu, Lianjun Wang, Wan Jiang, Wei Luo

Advanced Science　7　(21)　2020/11/01

DOI： 10.1002/advs.202002225 　

eISSN： 2198-3844
Evaluation of Initial Mechanical and Electrochemical Degradations in Amorphous Silicon Anode for Lithium-Ion Secondary Battery Using AE Method Peer-reviewed

Naoki YOSHIDA, Kazuhisa SATO, Naoaki KUWATA, Junichi KAWAMURA, Tadashi SAKAMOTO, Toshiyuki HASHIDA

Journal of the Society of Materials Science, Japan　69　(7)　547-554　2020/07/15
Publisher: Society of Materials Science, Japan
DOI： 10.2472/jsms.69.547 　

ISSN： 0514-5163

eISSN： 1880-7488
Influences of Ni content and porosity on mechanical properties of Ni–YSZ composites under solid oxide fuel cell operating conditions Peer-reviewed

Satoshi Watanabe, Shinji Sukino, Taihei Miyasaka, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Toshiyuki Hashida

Journal of Materials Science　55　(20)　8679-8693　2020/07/01

DOI： 10.1007/s10853-020-04624-4 　

ISSN： 0022-2461

eISSN： 1573-4803
Amorphous titanium-oxide supercapacitors with high capacitance Peer-reviewed

Mikio Fukuhara, Tomoyuki Kuroda, Fumihiko Hasegawa, Yasuyuki Shirai, Tomoyuki Suwa, Toshiyuki Hashida, Masahiko Nishijima

EPL (Europhysics Letters)　128　(5)　58001-p1-58001-p5　2020/02/04
Publisher: IOP Publishing
DOI： 10.1209/0295-5075/128/58001 　

eISSN： 1286-4854
Surface analyses of amorphous aluminum oxides with AlO6 clusters Peer-reviewed

Mikio Fukuhara, Tomoyuki Kuroda, Fumihiko Hasegawa, Toshiyuki Hashida, Hotaka Yagyu, Kazuya Konno, Masahiko Nishijima, Eunsang Kwon

MRS Communications　10　(4)　1-6　2020
Publisher: Springer Science and Business Media LLC
DOI： 10.1557/mrc.2020.82 　

ISSN： 2159-6859

eISSN： 2159-6867
Enhanced tribological performance of alumina composites reinforced with acid-treated carbon nanotubes under water lubrication Peer-reviewed

Keiichi Shirasu, Takuto Miyaura, Go Yamamoto, Takaharu Suzuki, Kimiyoshi Naito, Toshiyuki Hashida

Diamond and Related Materials　101　2020/01

DOI： 10.1016/j.diamond.2019.107657 　

ISSN： 0925-9635
Stack-coating of multishell carbon layers templated with carbon nanotubes Peer-reviewed

Keiichi Shirasu, Miho Asaoka, Takamichi Miyazaki, Go Yamamoto, Toshiyuki Hashida

Materials Today Communications　21　100608　2019/12
Estimations of heat transfer area using tracer and temperature data in geothermal fields Peer-reviewed

Suzuki Anna, Ikhwanda Fuad, Yamaguchi Aoi, Hashida Toshiyuki

Geosciences　9　(10)　2019/10

DOI： 10.3390/geosciences9100425 　
Effects of temperatures and carbon dioxide nanobubbles on superior electric storage for anodically oxidized films of AlY10 amorphous alloy Peer-reviewed

Mikio Fukuhara, Tomoyuki Kuroda, Fumihiko Hasegawa, Masayoshi Takahashi, Tomoyuki Suwa, Toshiyuki Hashida, Kazuhisa Sato, Masahiko Nishijima, K. Konno

AIP Advances　9　095202　2019/09

DOI： 10.1063/1.5102082 　
Evaluation Method of Current Distribution in SOFC in Operation Peer-reviewed

Takashi Tsuchikura, Tadashi Sakamoto, Tenyo Zukawa, Hirofumi Sumi, Kazuhisa Sato, Keiji Yashiro, Toshiyuki Hashida, Tatsuya Kawada

ECS Transactions　91　(1)　579-588　2019/09

DOI： 10.1149/09101.0579ecst 　
How do the mechanical properties of carbon nanotubes increase? An experimental evaluation and modeling of the engineering tensile strength of individual carbon nanotubes Peer-reviewed

Keiichi Shirasu, Go Yamamoto, Toshiyuki Hashida

Materials Research Express　6　(5)　055047　2019/05
Anodic oxidization of Al-Y amorphous alloy ribbons and their capacitive properties Peer-reviewed

Mikio Fukuhara, Tomoyuki Kuroda, Fumihiko Hasegawa, Yasuyuki Shirai, Toshiyuki Hashida, Kazuya Konno

Journal of Alloys and Compounds　776　757-762　2019/03

DOI： 10.1016/j.jallcom.2018.10.346 　

ISSN： 0925-8388

eISSN： 1873-4669
Effects of high-temperature thermal annealing on properties of aligned multi-walled carbon nanotube sheets and their composites Peer-reviewed

Tran Huu Nam, Ken Goto, Yoshinobu Shimamura, Yoku Inoue, Go Yamamoto, Keiichi Shirasu, Toshiyuki Hashida

Composite Interfaces　2019
Mechanical and thermal expansion properties of aligned carbon nanotube reinforced epoxy composites Peer-reviewed

Keiichi Shirasu, Itaru Tamaki, Go Yamamoto, Toshiyuki Hashida

Mechanical Engineering Journal　2019
Evaluation of Creep Properties in Anode Materials for Solid Oxide Fuel Cells by Using Small Punch Testing Method Peer-reviewed

Yihui Huang, Kazuhisa Sato, Keigo Kumada, Toshiyuki Hashida

ECS Transactions　Volume 91　(1)　761-769　2019

DOI： 10.1149/09101.0761ecst 　
Proposal of a Modified Four-Point Bending Method for Determining Interfacial Fracture Energy at Electrode/Electrolyte Interfaces in SOFCs Peer-reviewed

Keigo Kumada, Kazuhisa Sato, Yuki Asoh, Toshiyuki Hashida

2019 volume 91, issue 1, 825-835　volume 91　(1)　825-835　2019

DOI： 10.1149/09101.0825ecst 　
Effect of graphitization on mechanical properties of untwisted carbon nanotube yarn and its strength development mechanism Peer-reviewed

Taesung KIM, Anri HAYASHI, Hidefumi NIKAWA, Keiichi SHIRASU, Go YAMAMOTO, Toshiyuki HASHIDA, Atsushi HOSOI, Hiroyuki KAWADA

Transactions of the JSME　84　(860)　17-00585-00585-17-00585　2018/04
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/transjsme.17-00585 　

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Carbon nanotube yarn, which is an aggregation of Carbon nanotubes (CNTs), enables CNTs to be used on macro scale. However, tensile strength of the CNT yarn is much lower than CNT itself, and improvement of the mechanical properties is a challenge for practical application of the yarns. CNTs composing the yarns include some defect structures and impure materials, and their presence can cause a decrease in tensile strength of the yarn. In this study, untwisted CNT yarns were fabricated by dry spun method and graphitized at a temperature of 2800°C for the purpose of improving mechanical properties. Additionally, strength of a CNT composing the yarn and interactive force between the CNTs were evaluated to clarify strength development mechanism of the graphitized CNT yarn. Crystallinity of the CNT yarn was improved more than ten times, and defect structures and impure materials was removed by the graphitization treatment. As a result of single fiber tensile tests, strength of the yarn was increased by 20~35% after the graphitization. On the other hand, strength of the CNT composing the yarn was decreased. The breaking form of the CNT yarn was changed from pulling out of CNT bundles to rapture of the bundles by the graphitization, indicating an increase of interactive force between the bundles. In addition, as a result of pulling out simulations by molecular dynamics method, it was indicated that the pulling out of the CNT bundles were suppressed by increase in van der Waals force. Consequently, the improvement of mechanical properties of the untwisted CNT yarns was not due to the change in the strength of the CNT in the yarns but the main cause was the increase in the interactive force between the CNTs.
Mathematical modeling of non-Fickian diffusional mass exchange of radioactive contaminants in geological disposal formations Peer-reviewed

Anna Suzuki, Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida

Water (Switzerland)　10　(2)　123-133　2018/01/29
Publisher: MDPI AG
DOI： 10.3390/w10020123 　

ISSN： 2073-4441
Development of Numerical Methods for Estimating Fluid Flow Path in Fractured Geothermal Reservoir Peer-reviewed

Fuad Ikhwanda, Anna Suzuki, Toshiyuki Hashida

Proceedings of the 43rd Stanford Geothermal Workshop, Stanford University, Stanford, California, February 12-14, 2018, STG-TR-213　in CD ROM　2018
Dry-out phenomenon and flow behavior in rocks for CO2 geological storage, Peer-reviewed

Huong Nguyen, Thi Thanh, Anna Suzuki, Satoshi Uehara, Toshiyuki Hashida

Proceedings of the 15th International Conference on Flow Dynamics, November 7-9, 2018, Sendai International Center, Sendai, Japan　in CD ROM　2018
Amorphous aluminum-oxide supercapacitors Peer-reviewed

Mikio Fukuhara, Tomoyuki Kuroda, Fumihiko Hasegawa, Toshiyuki Hashida, Eunsang Kwon, Kazuya Konno

EuroPhysics Letters (EPL)　123　58004-p1-58004-p5　2018

DOI： 10.1209/0295-5075/123/58004 　
Development of large-movements and high-force electrothermal bimorph actuators based on aligned carbon nanotube reinforced epoxy composites Peer-reviewed

Keiichi Shirasu, Go Yamamoto, Yoku Inoue, Toshio Ogasawara, Yoshinobu Shimamura, Toshiyuki Hashida

SENSORS AND ACTUATORS A-PHYSICAL　267　455-463　2017/11

DOI： 10.1016/j.sna.2017.10.051 　

ISSN： 0924-4247
Parallel Large-Scale Molecular Dynamics Simulation Opens New Perspective to Clarify the Effect of a Porous Structure on the Sintering Process of Ni/YSZ Multiparticles Peer-reviewed

Jingxiang Xu, Yuji Higuchi, Nobuki Ozawa, Kazuhisa Sato, Toshiyuki Hashida, Momoji Kubo

ACS APPLIED MATERIALS & INTERFACES　9　(37)　31816-31824　2017/09

DOI： 10.1021/acsami.7b07737 　

ISSN： 1944-8244
Friction and wear properties of carbon nanotube/alumina composites under water lubricated conditions Peer-reviewed

Keiichi Shirasu, Takuto Miyaura, Go Yamamoto, Toshiyuki Hashida

Proceedings of the 21th International Conference on Composite Materials, (2017), in CD ROM　2017/08

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21st International Conference on Composite Materials, Xi’an, China, August 21-25, 2017
Key factors limiting carbon nanotube strength: Structural characterization and mechanical properties of multi-walled carbon nanotubes Peer-reviewed

Keiichi Shirasu, Itaru Tamaki, Takamichi Miyazaki, Go Yamamoto, Raman Bekarevich, Kaori Hirahara, Yoshinobu Shimamura, Yoku Inoue, Toshiyuki Hashida

Mechanical Engineering Journal, The Japan Society of Mechanical Engineers　4　(5)　2017/06/21

DOI： 10.1299/transjsme.17-00029 　

ISSN： 2187-9745
Evaluation of Mechanical Damages in SOFCs during Start/Stop Operation by Using Acoustic Emission Technique Peer-reviewed

Keigo Kumada, Kazuhisa Sato, Toshiyuki Hashida

ECS Transactions　78　(1)　2355-2363　2017/05/30
Publisher: The Electrochemical Society
DOI： 10.1149/07801.2355ecst 　

ISSN： 1938-6737

eISSN： 1938-5862

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Proceedings of 15th International Symposium on Solid Oxide Fuel Cells (SOFC-XV), July 23-28, 2017, Hollywood, Florida, USA, Diplomat Resort & Spa, pp. 2355-2363, 180 (Poster presentation)
Materials properties for the simulation of electro-chemo-mechanical coupling behavior of SOFC Peer-reviewed

K. Yashiro, T. Kawada, S. Watanabe, M. Muramatsu, T. Sakamoto, S. I. Hashimoto, K. Terada, M. Sato, T. Hashida, K. Sato, F. Iguchi, H. Yugami, K. Amezawa, T. Nakamura, Y. Kimura, A. Unemoto

ECS Transactions　78　(1)　2309-2316　2017/05/30
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07801.2309ecst 　

ISSN： 1938-6737 1938-5862

eISSN： 1938-6737
Evaluation of Mechanical Damages in SOFCs during Start/Stop Operation by Using Acoustic Emission Technique Peer-reviewed

Keigo Kumada, Kazuhisa Sato, Toshiyuki Hashida

ECS Transactions　78　(1)　2355-2363　2017/05/30
Publisher: The Electrochemical Society
DOI： 10.1149/07801.2355ecst 　

ISSN： 1938-6737

eISSN： 1938-5862
Potential use of CNTs for production of zero thermal expansion coefficient composite materials: An experimental evaluation of axial thermal expansion coefficient of CNTs using a combination of thermal expansion and uniaxial tensile tests Peer-reviewed

Keiichi Shirasu, Akihiro Nakamura, Go Yamamoto, Toshio Ogasawara, Yoshinobu Shimamura, Yoku Inoue, Toshiyuki Hashida

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING　95　152-160　2017/04

DOI： 10.1016/j.compositesa.2016.12.027 　

ISSN： 1359-835X

eISSN： 1878-5840
Is the tensile strength of carbon nanotubes enhanced by supported materials? : Effect of supported amorphous alumina nanoparticles on the tensile strength of carbon nanotubes Peer-reviewed

Tatsuhito Kimura, Hideaki Suzuki, Mei Zhang, Go Yamamoto, Toshiyuki Hashida, Kenichi Motomiya, Kazuyuki Tohji, Yoshinori Sato

Carbon　118　339-342　2017/03/27
Publisher: Elsevier BV
DOI： 10.1016/j.carbon.2017.03.057 　

ISSN： 0008-6223
多層カーボンナノチューブの強度・破壊特性評価と構造欠陥の影響に関する研究 Peer-reviewed

玉木格, 白須圭一, 宮崎孝道, 山本剛, Raman Bekarevich, 平原佳織, 島村佳伸, 井上翼, 橋田俊之

日本機械学会論文集　83　(847)　16-00283-16-00283　2017

DOI： 10.1299/transjsme.16-00283 　

ISSN： 2187-9761
Mechanical strength evaluation of YSZ, GDC and LSCF under SOFC operating condition Peer-reviewed

S.Watanabe, K.Sato, F.Iguchi, K.Yashiro, T.Hashida, T.Kawada

ECS Transactions　78　(1)　2181-2190　2017
Sensing Fluid Pressure With Co Rich Fe-Co System Magnetostrictive Alloy Tube Peer-reviewed

Takashi Mizoguchi, Tsutomu Takahashi, Toshiyuki Hashida, Yasubumi Furuya

Proc. of The 10th JFPS International Symposium on Fluid Power, October 24-27, 2017, Fukuoka, Japan,　in CD ROM　2017
Influence of supported PtPd nanoparticles on the tensile strength of individual multi-walled carbon nanotubes: strength decrease by the interaction of metal and nanotube Peer-reviewed

Hideaki Suzuki, Tatsuhito Kimura, Go Yamamoto, Toshiyuki Hashida, Kenichi Motomiya, Kazuyuki Tohji, Yoshinori Sato

RSC ADVANCES　7　(79)　49917-49922　2017

DOI： 10.1039/c7ra09340c 　

ISSN： 2046-2069
Temperature dependence of axial thermal expansion coefficient of multi-walled carbon nanotubes (A procedure based on measurements of coefficient of thermal expansion for aligned carbon nanotube/epoxy composites) Peer-reviewed

Keiichi Shirasu, Akihiro Nakamura, Go Yamamoto, Toshio Ogasawara, Yoshinobu Shimamura, Yoku Inoue, Toshiyuki Hashida

Transactions of the JSME (in Japanese)　82　(844)　1-13　2016/12/25

DOI： 10.1299/transjsme.16-00228 　
Estimation of micro-size defects in electrolyte thin-film by X-ray stress measurement for anode-supported solid oxide fuel cells Peer-reviewed

Hirofumi Sumi, Hiroyuki Shimada, Kazuhisa Sato, Toshiyuki Hashida

Mechanical Engineering Journal　3　(6)　Online　2016/12/15

DOI： 10.1299/mej.16-00177 　
Fractional diffusion modeling of heat transfer in porous and fractured media Peer-reviewed

Anna Suzuki, Sergei A. Fomin, Vladimir A. Chugunov, Yuichi Niibori, Toshiyuki Hashida

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER　103　611-618　2016/12

DOI： 10.1016/j.ijheatmasstransfer.2016.08.002 　

ISSN： 0017-9310

eISSN： 1879-2189
Experimental tests of truncated diffusion in fault damage zones Peer-reviewed

Anna Suzuki, Toshiyuki Hashida, Kewen Li, Roland N. Horne

WATER RESOURCES RESEARCH　52　(11)　8578-8589　2016/11

DOI： 10.1002/2016WR019017 　

ISSN： 0043-1397

eISSN： 1944-7973
In-situ characterization of interfacial shear strength in multi-walled carbon nanotube reinforced aluminum matrix composites Peer-reviewed

Weiwei Zhou, Go Yamamoto, Yuchi Fan, Hansang Kwon, Toshiyuki Hashida, Akira Kawasaki

CARBON　106　37-47　2016/09

DOI： 10.1016/j.carbon.2016.05.015 　

ISSN： 0008-6223

eISSN： 1873-3891
Preparation and performance evaluation of electrothermal actuators using aligned carbon nanotube reinforced epoxy composites Peer-reviewed

Keiichi Shirasu, Akihiro Nakamura, Go Yamamoto, Toshio Ogasawara, Yoshinobu Shimamura, Yoku Inoue, Toshiyuki Hashida

Mechanical Engineering Journal　3　(4)　15-00607-15-00607　2016/01/21
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/mej.15-00607 　

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ONLINE ISSN: 2187-9745
In situ Evaluation of Mechanical and Electrochemical Degradation in Silicon Negative Electrode for Lithium-Ion Secondary Batteries Peer-reviewed

Naoki Yoshida, Tadashi Sakamoto, Naoaki Kuwata, Junichi Kawamura, Kazuhisa Sato, Toshiyuki Hashida

2016 IEEE 16TH INTERNATIONAL CONFERENCE ON NANOTECHNOLOGY (IEEE-NANO)　974-977　2016

DOI： 10.1109/NANO.2016.7751563 　
Investigation of Mechanical Damage of SOFC caused by Electrochemical Oxidation Using In-Situ Acoustic Emission and Electrochemical Technique Peer-reviewed

Keigo Kumada, Kazuhisa Sato, Toshiyuki Hashida

2016 IEEE 16TH INTERNATIONAL CONFERENCE ON NANOTECHNOLOGY (IEEE-NANO)　970-973　2016

DOI： 10.1109/NANO.2016.7751562 　
Electrochemical degradation caused by mechanical damage in silicon negative electrodes Peer-reviewed

N. Yoshida, T. Sakamoto, N. Kuwata, J. Kawamura, K. Sato, T. Hashida

ECS Transactions　75　(20)　31-37　2016
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07520.0031ecst 　

ISSN： 1938-5862 1938-6737
Preparation and electrochemical evaluation of LiCoO2 film prepared with cold spraying for development of lithium-ion battery Peer-reviewed

Kohei Okuyama, Naoki Yoshida, Kazuhisa Sato, Toshiyuki Hashida

ECS Transactions　75　(20)　191-199　2016
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07520.0191ecst 　

ISSN： 1938-5862 1938-6737
Fractional Dynamics in Fault Structures Peer-reviewed

Anna Suzuki, Toshiyuki Hashida, Kewen Li, Ronald Horne

Proceedings of the 41st Stanford Geothermal Workshop, February 22-24, 2016, Stanford, California　705-715　2016
Mathematical Modeling of the Anomalous Transport of Radioactive Materials in a Porous Medium Peer-reviewed

Sergei Fomin, Vladimir Chugunov, Anna Suzuki, Toshiyuki Hashida

The 12th International Heat Transfer Conference (HEFAT2016) Transaction　1399-1403　2016
Characterization of 3D Printed Fracture Networks Peer-reviewed

Anna Suzuki, Stock Sawadee, Hiroshi Makita, Toshiyuki Hashida, Kewen Li, Ronald Horne

Proceedings of the 41st Stanford Geothermal Workshop, February 22-24, 2016, Stanford, California, SGP-TR-209　424-438　2016
Evaluation of Tensile Properties of Multi-Walled Carbon Nanotubes Synthesized by Chemical Vapor Deposition Peer-reviewed

Itaru Tamaki, Keiichi Shirasu, Takamichi Miyazaki, Go Yamamoto, Raman Bekarevich, Kaori Hirahara, Yoshinobu Shimamura, Yoku Inoue, Toshiyuki Hashida

Proc. of Asia-Pacific Conference on Fracture and Strength 2016 (APCFS2016)　2016
Negative axial thermal expansion coefficient of carbon nanotubes: Experimental determination based on measurements of coefficient of thermal expansion for aligned carbon nanotube reinforced epoxy composites Peer-reviewed

Keiichi Shirasu, Go Yamamoto, Itaru Tamaki, Toshio Ogasawara, Yoshinobu Shimamura, Yoku Inoue, Toshiyuki Hashida

CARBON　95　904-909　2015/12

DOI： 10.1016/j.carbon.2015.09.026 　

ISSN： 0008-6223

eISSN： 1873-3891
Effects of processing conditions on microstructure, electrical conductivity and mechanical properties of MWCNT/alumina composites prepared by flocculation Peer-reviewed

Weili Wang, Go Yamamoto, Keiichi Shirasu, Yo Nozaka, Toshiyuki Hashida

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY　35　(14)　3903-3908　2015/11

DOI： 10.1016/j.jeurceramsoc.2015.06.027 　

ISSN： 0955-2219

eISSN： 1873-619X
Relationship between microstructure and mechanical properties in acid-treated carbon nanotube-reinforced alumina composites Peer-reviewed

Keiichi Shirasu, Go Yamamoto, Yo Nozaka, Weili Wang, Toshiyuki Hashida

JOURNAL OF MATERIALS SCIENCE　50　(20)　6688-6699　2015/10

DOI： 10.1007/s10853-015-9223-6 　

ISSN： 0022-2461

eISSN： 1573-4803
Indentation strength of silicon nitride ceramics processed by spark plasma sintering technique Peer-reviewed

N. Azeggagh, L. Joly-Pottuz, J. Chevalier, M. Omori, T. Hashida, D. Nelias

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　644　159-170　2015/09

DOI： 10.1016/j.msea.2015.07.053 　

ISSN： 0921-5093

eISSN： 1873-4936
Prediction of reinjection effects in fault-related subsidiary structures by using fractional derivative-based mathematical models for sustainable design of geothermal reservoirs Peer-reviewed

Anna Suzuki, Yuichi Niibori, Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida

GEOTHERMICS　57　196-204　2015/09

DOI： 10.1016/j.geothermics.2015.04.001 　

ISSN： 0375-6505

eISSN： 1879-3576
Hertzian contact damage in silicon nitride ceramics with different porosity contents Peer-reviewed

N. Azeggagh, L. Joly-Pottuz, D. Nelias, J. Chevalier, M. Omori, T. Hashida

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY　35　(8)　2269-2276　2015/08

DOI： 10.1016/j.jeurceramsoc.2015.01.031 　

ISSN： 0955-2219

eISSN： 1873-619X
Microstructuring of carbon nanotubes-nickel nanocomposite Peer-reviewed

Zhonglie An, Liang He, Masaya Toda, Go Yamamoto, Toshiyuki Hashida, Takahito Ono

Nanotechnology　26　(19)　195601-195608　2015/05/15

DOI： 10.1088/0957-4484/26/19/195601 　

ISSN： 0957-4484

eISSN： 1361-6528
Synthesis of carbon nanotubes-Ni composite for micromechanical elements application Peer-reviewed

Zhonglie An, Masaya Toda, Go Yamamoto, Toshiyuki Hashida, Takahito Ono

Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS)　2015-February　(February)　401-404　2015/02/26

DOI： 10.1109/MEMSYS.2015.7050974 　

ISSN： 1084-6999
Small punch creep test in a 316 austenitic stainless steel Peer-reviewed

Maribel L. Saucedo-Muñoz, Shi-Ichi Komazaki, Toshiyuki Hashida, Víctor M. López-Hirata

Revista de Metalurgia　51　(1)　e034-e034　2015/02/25
Publisher: Editorial CSIC
DOI： 10.3989/revmetalm.034 　

ISSN： 0034-8570

eISSN： 1988-4222
Anomalous solute and heat diffusion in fault structures

Suzuki Anna, Hashida Toshiyuki, Li Kewen, Horne Ronald

Proceedings of the 40th Stanford Geothermal Workshop　2015/02
Analysis of Water Injection in Fractured Reservoirs Using a Fractional-Derivative-Based Mass and Heat Transfer Model Peer-reviewed

Anna Suzuki, Yuichi Niibori, Sergei A. Fomin, Vladimir A. Chugunov, Toshiyuki Hashida

MATHEMATICAL GEOSCIENCES　47　(1)　31-49　2015/01

DOI： 10.1007/s11004-014-9522-5 　

ISSN： 1874-8961

eISSN： 1874-8953
Fractional derivative-based tracer analysis method for the characterization of mass transport in fractured geothermal reservoirs Peer-reviewed

Anna Suzuki, Yuichi Niibori, Sergei A. Fomin, Vladimir A. Chugunov, Toshiyuki Hashida

GEOTHERMICS　53　125-132　2015/01

DOI： 10.1016/j.geothermics.2014.05.003 　

ISSN： 0375-6505

eISSN： 1879-3576
Multi-nanoparticle model simulations of the porosity effect on sintering processes in Ni/YSZ and Ni/ScSZ by the molecular dynamics method Peer-reviewed

Jingxiang Xu, Shandan Bai, Yuji Higuchi, Nobuki Ozawa, Kazuhisa Sato, Toshiyuki Hashida, Momoji Kubo

JOURNAL OF MATERIALS CHEMISTRY A　3　(43)　21518-21527　2015

DOI： 10.1039/c5ta05575j 　

ISSN： 2050-7488

eISSN： 2050-7496
High temperature strength and elastic properties of doped ceria under various oxygen partial pressures Peer-reviewed

T. Taguchi, S. Watanabe, K. Sato, T. Hashida

ECS Transactions　68　(1)　375-385　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06801.0375ecst 　

ISSN： 1938-6737 1938-5862
Characterization of mass/heat transfer in fractured geothermal reservoirs by means of mathematical model for complex systems Peer-reviewed

Anna Suzuki, Yuichi Niibori, Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida

Proceedings of World Geothermal Congress, April 16-24, 2015, Australia-New Zealand　in CD ROM　2015
Characterization of Tracer Responses in Fractured Geothermal Reservoirs Based on Fractional Derivative Mathematical Model for Estimation of Fracture Distribution in Geothermal Reservoirs Peer-reviewed

Hiroshi MAKITA, Anna SUZUKI, Takumi IWAGAKI, Yuichi NIIBORI, Toshiyuki HASHIDA

Journal of MMIJ, The Mining and Materials Processing Institute of Japan　131　(1)　1-8　2015
Inclined slit-based pullout method for determining interfacial strength of multi-walled carbon nanotube-alumina composites Peer-reviewed

Yo Nozaka, Weili Wang, Keiichi Shirasu, Go Yamamoto, Toshiyuki Hashida

CARBON　78　439-445　2014/11

DOI： 10.1016/j.carbon.2014.07.024 　

ISSN： 0008-6223

eISSN： 1873-3891
Microstructure-property relationships in pressureless-sintered carbon nanotube/alumina composites Peer-reviewed

Go Yamamoto, Keiichi Shirasu, Yo Nozaka, Weili Wang, Toshiyuki Hashida

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　617　(3)　179-186　2014/11

DOI： 10.1016/j.msea.2014.08.068 　

ISSN： 0921-5093

eISSN： 1873-4936
Development of mathematical heat transfer model toward design of reinjection for sustainable geothermal extraction Peer-reviewed

Suzuki Anna, Niibori Yuichi, Fomin Sergei A, Chugunov Vladimir A, Hashida Toshiyuki

Proceedings of Grand Renewable Energy 2014 International Conference and Exhibition　2014/08
Resonant Silicon Micromirror with Electrophated Carbon Nanotubes-Nickel Composite Beams for MEMS Application

Ahonglie An, Masaya Toda, Go Yamamoto, Toshiyuki Hashida, Takahito Ono

The IEEE International Nanoelectonics Conference　6　173　2014/07/28
Tensile mechanical properties of carbon nanotube/epoxy composite fabricated by pultrusion of carbon nanotube spun yarn preform Peer-reviewed

Yoshinobu Shimamura, Kahori Oshima, Keiichiro Tohgo, Tomoyuki Fujii, Keiichi Shirasu, Go Yamamoto, Toshiyuki Hashida, Ken Goto, Toshio Ogasawara, Kimiyoshi Naito, Takayuki Nakano, Yoku Inoue

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING　62　32-38　2014/07

DOI： 10.1016/j.compositesa.2014.03.011 　

ISSN： 1359-835X

eISSN： 1878-5840
Structural and Electrochemical Characterization of Ethylenediaminated Single-Walled Carbon Nanotubes Prepared from Fluorinated SWCNTs Peer-reviewed

Kohei Bushimata, Shin-ichi Ogino, Kazutaka Hirano, Tatsuhiro Yabune, Kenta Sato, Takashi Itoh, Kenichi Motomiya, Koji Yokoyama, Daiki Mabuchi, Hikaru Nishizaka, Go Yamamoto, Toshiyuki Hashida, Kazuyuki Tohji, Yoshinori Sato

JOURNAL OF PHYSICAL CHEMISTRY C　118　(27)　14948-14956　2014/07

DOI： 10.1021/jp503124n 　

ISSN： 1932-7447
Shytheisis and Characterization of Carbon Nanotube-Nickel Composite with High Content of Carbon Nanotubes

Zhonglie An, Masaya Toda, Go Yamamoto, Toshiyuki Hashida, Takahito Ono

The Asia-Pacific Conference on Transducers and Micro/Nano Technologies　7　14-5　2014/06/29
Communication: Different behavior of Young's modulus and fracture strength of CeO2: Density functional theory calculations Peer-reviewed

Ryota Sakanoi, Tomomi Shimazaki, Jingxiang Xu, Yuji Higuchi, Nobuki Ozawa, Kazuhisa Sato, Toshiyuki Hashida, Momoji Kubo

JOURNAL OF CHEMICAL PHYSICS　140　(12)　140-143　2014/03

DOI： 10.1063/1.4869515 　

ISSN： 0021-9606

eISSN： 1089-7690
Fabrication of CNT-carbon composite microstructures using Si micromolding and pyrolysis Peer-reviewed

Liang He, Masaya Toda, Yusuke Kawai, Hidetoshi Miyashita, Mamoru Omori, Toshiyuki Hashida, Rüdiger Berger, Takahito Ono

Microsystem Technologies　20　(2)　201-208　2014/02

DOI： 10.1007/s00542-013-1771-6 　

ISSN： 0946-7076
Structure-property relationships in thermally-annealed multi-walled carbon nanotubes Peer-reviewed

Go Yamamoto, Keiichi Shirasu, Yo Nozaka, Yoshinori Sato, Toshiyuki Takagi, Toshiyuki Hashida

CARBON　66　219-226　2014/01

DOI： 10.1016/j.carbon.2013.08.061 　

ISSN： 0008-6223

eISSN： 1873-3891
A simple 3-D thermoplastic model for assessment of the long-term performance of the Hijiori deep geothermal reservoir Peer-reviewed

Yani Jing, Zhenzi Jing, Jonathan Willis-Richards, Toshiyuki Hashida

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH　269　14-22　2014/01

DOI： 10.1016/j.jvolgeores.2013.10.012 　

ISSN： 0377-0273

eISSN： 1872-6097
Microstructure and Mechanical Properties of Multi-Walled Carbon Nanotube/Alumina Composites Prepared By A Novel Flocculation Method Peer-reviewed

W.L. Wang, G. Yamamoto, K. Shirasu, Y. Nozaka, T. Hashida

Proceedings of 16TH European Conference On Composite Materials (ECCM16), Seville, Spain, 22-26 June 2014　in CD ROM　2014
Fabrication And Mechanical Evaluatuion Of Aligned Multi-Walled Carbon Nanotube Sheet/Alumina Laminated Ceramic Composites Peer-reviewed

G. Yamamoto, K. Shirasu, Y. Nozaka, Y. Shimamura, Y. Inoue, T. Hashida

Proceedings of 16TH European Conference On Composite Materials (ECCM16), Seville, Spain, 22-26 June 2014　in CD ROM　2014
Characterization of Mass / Heat Transfer in Fractured Geothermal Reservoirs Using Mathematical Model of Complex Dynamical System Peer-reviewed

Anna Suzuki, Yuichi Niibori, Sergei A Fomin, Vladimir A Chugunov, Toshiyuki Hashida

Proceedings of 39th Stanford Geothermal Workshop, Stanford University, Stanford, California, February 24-26, 2014, SGP-TR-202　1-9　2014
Mechanical Analysis to Improve Reliability and Durability of Solid Oxide Fuel Cells Peer-reviewed

Kazuhisa Sato, Toshiyuki Hashida

Materials Science Forum　783-786　1704-1707　2014

DOI： 10.4028/www.scientific.net/MSF.783-786.170 　
Analysis of Confining Pressure Dependency of Apparent Fracture Toughness of Rock Based on Cohesive Crack Model Peer-reviewed

Kazushi Sato, Toshiyuki Hashida

Proceedings of the 6th International Symposium on In-situ Rock Stress (ISRM Specialized Conference 2013), August 20-22, 2013, Sendai, Japan, in CD ROM　2013/08/20
Development of Pressureless Sintering Method for Carbon Nanotube/Alumina Composites and Their Microstructure-Property Relationships Peer-reviewed

Go YAMAMOTO, Keiichi SHIRASU, Yo NOZAKA, Takahumi NAKAMURA, Toshiyuki HASHIDA

Journal of Solid Mechanics and Materials Engineering　7　(3)　394-402　2013/05
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jmmp.7.394 　

ISSN： 1880-9871

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Multi-walled carbon nanotube (MWCNT)/alumina composites with different amounts of MWCNTs were prepared by a simple mechanical mixing method followed by a pressureless sintering. The effects of microstructures including grain size, MWCNT location, fracture patterns of the matrix and dispersibility of MWCNTs on the mechanical properties of the resultant composites were investigated. It was demonstrated from microstructural observations and fracture tests of the composites that grain size, MWCNT location and fracture patterns had no significant impact on the mechanical properties of the composites prepared under the processing conditions used in this research. In contrast, the state of MWCNT dispersion within the composites was shown to be one of the important factors affecting the strength and toughness enhancement in our composites. The dispersibility of MWCNTs decreased monotonically as a function of MWCNT volume fraction. The degradation in the mechanical properties observed for the composites with a higher amount of MWCNTs was shown to be associated with the dispersibility of MWCNTs, and a MWCNT agglomerate was anticipated to act as imperfections and led to a reduction of mechanical properties.
Pull-out simulations of a capped carbon nanotube in carbon nanotube-reinforced nanocomposites Peer-reviewed

Y. Li, S. Liu, N. Hu, X. Han, L. Zhou, H. Ning, L. Wu, Alamusi, G. Yamamoto, C. Chang, T. Hashida, S. Atobe, H. Fukunaga

Journal of Applied Physics　113　(14)　144304-1-144304-7　2013/04/14

DOI： 10.1063/1.4800110 　

ISSN： 0021-8979
Water saturation dependence on CO2 sorption capacity of sandstones Peer-reviewed

Takashi Fujii, Kaori Endo, Satomi Nakagawa, Yoshiyuki Sato, Hiroshi Inomata, Shinsuke Nakao, Toshiyuki Hashida

GHGT-11　37　5360-5366　2013

DOI： 10.1016/j.egypro.2013.06.454 　

ISSN： 1876-6102
固体酸化物形燃料電池材料の機械的特性のin situ測定 Invited Peer-reviewed

雨澤浩史, 佐藤一永, 橋田俊之, 川田達也

Netsu Sokutei　40　1-7　2013
Molecular Dynamics Simulation of Ni Nanoparticles Sintering Process in Ni/YSZ Multi-Nanoparticle System Peer-reviewed

J. Xu, R. Sakanoi, Y. Higuchi, N. Ozawa, K. Sato, T. Hashida, M. Kubo

J. Phys. Chem. C　117　9663-9672　2013

DOI： 10.1021/jp310920d 　
Basic Study of Mechanical Properties of SOFC Components for Improvement of Reliability and Durability Peer-reviewed

Kazuhisa Sato, Satoshi Watanabe, Koji Amezawa, Tatsuya Kawada, Toshiyuki Hashida

Ceramics Japan (Bulletin of the Ceramic Society of Japan)　48　(3)　159-164　2013
完全固体電池開発のための人工知能技術の必要性 Peer-reviewed

佐藤一永, 福井健一, 高藤淳, 橋田俊之, 水崎純一郎

人工知能学会誌　28　(4)　529-534　2013
Change in Permeability of Kimachi Sandstone and iidate Granite with Supercritical CO2 Injection Peer-reviewed

Takashi Fujii, Yuichi Suga, Kyuro Sasaki, Toshiyuki Hashida, Toshiyuki Tosha, Shinsuke Nakao

Journal of The Mining and Materials Processing Institute of Japan (Journal of MMIJ)　129　(12)　701-706　2013
Publisher: The Mining and Materials Processing Institute of Japan
DOI： 10.2473/journalofmmij.129.701 　

ISSN： 1881-6118

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Understanding of interfacial interactions among supercritical CO₂ (scCO₂), water, and mineral phase is necessary for a precisely prediction of CO₂ migration into aquifers. The purpose of this study is to assess the impact of scCO₂ on flow property of Kimachi sandstone and Iidate granite in a CO₂ rich dense phase i.e., the condition of which scCO₂ is expected to displace formation water in the course of CO₂ injection. In this experiment, the permeability test for CO₂ gas was conducted before and after a CO₂ saturation procedure that is filled with scCO₂ in pores of rocks. To investigate a mechanical property of rock specimen in the presence of scCO₂, the axial strain was also measured using a laser displacement sensor during scCO₂ saturation processes. Our results showed that both Kimachi sandstone and Iidate granite samples tested have a more or less decreasing trend of gas permeability with increasing exposure time to scCO₂. It was further shown that the axial strain of Kimachi sandstone and Iidate granite increased as scCO₂-exposure time increased. Additionally, increases in masses and dimensions of test samples before and after scCO₂ saturation processes were clearly observed under atmospheric pressure conditions. It can, therefore be said that Kimachi sandstone and Iidate granite could be capable of swelling and permeability change accompanied by CO₂ sorption into their internal structures in the presence of scCO₂. Furthermore, the observed significant reduction in permeability cannot fully be explained by two model predictions based on Kozeney-Carman equation and Hagen-Poiseuille law, considering CO₂ sorption onto mineral phases. The present results pointed out that CO₂ sorption on rocks under geological CO₂ storage conditions could have a significantly impact on flow property of rocks during CO₂ injection and storage processes.
Multimodal Assessment of Durability and Reliability of Flattened Tubular SIS Stacks Peer-reviewed

Y. Matsuzaki, K. Nakamura, T. Somekawa, K. Fujita, T. Horita, K. Yamaji, H. Kishimoto, M. Yoshikawa, T. Yamamoto, Y. Mugikura, H. Yokokawa, N. Shikazono, K. Eguchi, T. Matsui, S. Watanabe, K. Sato, T. Hashida, T. Kawada, K. Sasaki, S. Taniguchi

SOLID OXIDE FUEL CELLS 13 (SOFC-XIII)　57　(1)　325-333　2013

DOI： 10.1149/05701.0325ecst 　

ISSN： 1938-5862
Intelligent Analysis for Evaluating Physical Degradation using Acoustic Emission Peer-reviewed

K. Fukui, K. Sato, T. Hashida, J. Mizusaki, M. Numao

SOLID OXIDE FUEL CELLS 13 (SOFC-XIII)　57　(1)　571-580　2013

DOI： 10.1149/05701.0571ecst 　

ISSN： 1938-5862
Evaluation of Elastic and Strength Properties of Ni-YSZ Cermets for Solid Oxide Fuel Cells under Redox Cycling Peer-reviewed

K. Sato, T. Miyasaka, S. Watanabe, T. Hashida

SOLID OXIDE FUEL CELLS 13 (SOFC-XIII)　57　(1)　753-762　2013

DOI： 10.1149/05701.0753ecst 　

ISSN： 1938-5862
Identification of Ni-YSZ Anode Creep Property Using PSO for Multiscale Simulation Peer-reviewed

S. Watanabe, F. Iguchi, K. Sato, K. Yamamoto, T. Hashida, K. Terada, T. Kawada

SOLID OXIDE FUEL CELLS 13 (SOFC-XIII)　57　(1)　1379-1386　2013

DOI： 10.1149/05701.1379ecst 　

ISSN： 1938-5862
Theoretical Study on the Effect of Three-Dimensional Porous Structure on the Sintering of Nickel Nanoparticles in the Ni/YSZ Anode Peer-reviewed

Jingxiang Xu, Yuji Higuchi, Nobuki Ozawa, Kazuhisa Sato, Toshiyuki Hashida, Momoji Kubo

SOLID OXIDE FUEL CELLS 13 (SOFC-XIII)　57　(1)　2459-2464　2013

DOI： 10.1149/05701.2459ecst 　

ISSN： 1938-5862
A Study of Prediction of Tracer Response at Diffrerent Inter-well Distances Using Fractional Advection-Dispersion Equation Peer-reviewed

Anna Suzuki, Hiroshi Makita, Yuichi Niibori, Toshiyuki Hashida

Journal of The Geothermal Research Society of Japan　35　(4)　149-161　2013
Publisher: THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN
DOI： 10.11367/grsj.35.149 　

ISSN： 0388-6735

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Use of fractional Advection-Dispersion Equation (fADE) has been proposed to describe mass transport in a fractured reservoir. In this study, a finite discrete method to solve the fADE is developed and its accuracy is tested against analytical solutions. Tracer simulation is carried out using a 3D simulation code for flow analysis (FRACSIM-3D). The fADE mathematical model is applied to fit the numerical tracer results, which show highly anomalous behaviors such as a long tail. The solution to the fADE including a spatial fractional derivative is shown to be in reasonable agreement with the tracer response produced by FRACSIM-3D. The fitting parameters of the fADE equation obtained for well interval of 50 m are used to make predictions of tracer responses for well intervals of 100 m - 500 m. It has been shown that the tracer responses predicted by the fADE model are reasonable close to those obtained by FRACSIM-3D irrespective of the different well intervals. This study demonstrates that the fADE offers a method for predicting tracer responses in a fractured reservoir.
Development of Fractional Derivative-Based Mass and Heat Transport Model Peer-reviewed

Anna Suzuki, Rol, N. Horne, Hiroshi Makita, Yuichi Niibori, Sergei A. Fomin, Vladimir A. Chugunov, Toshiyuki Hashida

Proceedings of Thirty-Eight Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, California, February 11-13, SGP-TR-198　in CD ROM　2013
In Situ Measurements of Mechanical Properties of Materials for Solid Oxide Fuel Cells Peer-reviewed

Koji Amezawa, Kazuhisa Sato, Toshiyuki Hashida, Tatsuya Kawada

Netsu Sokutei　40　(1)　23-29　2013/01
Effects of annealing treatment of carbon nanotube on the fracture properties of carbon Nanotube/Alumina composites Peer-reviewed

Keiichi Shirasu, Go Yamamoto, Yo Nozaka, Mamoru Omori, Toshiyuki Hashida

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A　79　(802)　706-710　2013

DOI： 10.1299/kikaia.79.706 　

ISSN： 0387-5008
Evaluation of mechanical properties and microstructures of multi-walled carbon Nanotube/Alumina composites prepared by pressureless sintering Peer-reviewed

Yo Nozaka, Go Yamamoto, Keiichi Shirasu, Mamoru Omori, Toshiyuki Takagi, Toshiyuki Hashida

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A　79　(802)　764-768　2013

DOI： 10.1299/kikaia.79.764 　

ISSN： 0387-5008
SOFC構成材料の物理化学的・機械的特性とセル・スタックの信頼性

川田達也, 渡辺智, 坂本正, 尾澤伸樹, 佐藤一永, 橋田俊之, 宇根本篤, 八代圭司, 雨澤浩史, 水崎純一郎, 井口史匡, 橋本真一, 湯上浩雄, 寺田賢二郎

第21回SOFC研究発表会予稿集　28-34　2012/12
Effects of Redox Cycling on the Mechanical Properties of Ni-YSZ Cermets for SOFC Anodes as a Function of Porosity Peer-reviewed

Taihei Miyasaka, Shinji Sukinou, Satoshi Watanabe, Kazuhisa Sato, Tatsuya Kawada, Toshiyuki Hashida

Proceedings of Ninth International Conference on Flow Dynamics, September 19-21, 2012, Sendai, Miyagi, Japan, (2012)　556-557　2012/09/19
Characterization of Fluid Flow in Fractured Geothermal Reservoirs based on Fractional Derivative Mathematical Model Peer-reviewed

Hiroshi Makita, Anna Suzuki, Yuichi Niibori, Toshiyuki Hashida

Proceedings of Ninth International Conference on Flow Dynamics, September 19-21, 2012, Sendai, Miyagi, Japan, (2012), 664-665　664-665　2012/09/19
Prediction of pull-out force of multi-walled carbon nanotube (MWCNT) in sword-in-sheath mode Peer-reviewed

Go Yamamoto, Sen Liu, Ning Hu, Toshiyuki Hashida, Yaolu Liu, Cheng Yan, Yuan Li, Hao Cui, Huiming Ning, Liangke Wu

COMPUTATIONAL MATERIALS SCIENCE　60　7-12　2012/07

DOI： 10.1016/j.commatsci.2012.03.016 　

ISSN： 0927-0256
Fabrication and Evaluation of Carbon Nanotube/Alumina Composites By Precursor Method Peer-reviewed

K. Shirasu, G. Yamamoto, Y. Nozaka, M. Omori, T. Hashida

15TH European Conference on Composite Materials (ECCM 15), Venice, Italy, 24-28, June 2012, (2012), in CDROM.　2012/06
Measurements of Carbon Nanotube Tensile Strength and Mechanical Properties of Carbon Nantube/Alumina Composites Prepared by Pressureless Sintering Peer-reviewed

G. Yamamoto, K. Shirasu, Y. Nozaka, T. Takagi, T. Hashida

15TH European Conference on Composite Materials (ECCM 15), Venice, Italy, 24-28, June 2012, (2012), in CDROM.　2012/06
Study on Durability of Flattened Tubular Segmented-in-Series Type SOFC Stacks Peer-reviewed

Kazuo Nakamura, Takaaki Somekawa, Kenjiro Fujita, Kenji Horiuchi, Yoshio Matsuzaki, Satoshi Yamashita, Harumi Yokokawa, Teruhisa Horita, Katsuhiko Yamaji, Haruo Kishimoto, Masahiro Yoshikawa, Tohru Yamamoto, Yoshihiro Mugikura, Satoshi Watanabe, Kazuhisa Sato, Toshiyuki Hashida, Tatsuya Kawada, Nobuhide Kasagi, Naoki Shikazono, Koichi Eguchi, Toshiaki Matsui, Kazunari Sasaki, Yusuke Shiratori

10th European SOFC Forum 2012, 26 – 29 June 2012, Lucerne Switzerland, A1206, (2012), in CDROM.　2012/06
Effects of Physicochemical and Mechanical Properties of the Materials on Reliability of SOFC Invited Peer-reviewed

Tatsuya Kawada, Satoshi Watanabe, Fumitada Iguchi, Kazuhisa Sato, Shin-ichi Hashimoto, Nobuki Ozawa, Tomomi Shimazaki, Kenjiro Terada, Keiji Yashiro, Koji Amezawa, Toshiyuki Hashida, Momoji Kubo, Hiroo Yugami, Junichiro Mizusaki

Journal of the Hydrogen Energy Systems Society of Japan　37　(2)　101-106　2012/02
CORRELATIONSHIP BETWEEN J(IC) AND EQUIVALENT FRACTURE STRAIN DETERMINED BY SMALL-PUNCH TEST IN JN1, JJ1 AN JK2 AUSTENITIC STAINLESS STEELS Peer-reviewed

Maribel L. Saucedo-Munoz, Toshiyuki Hashida, Victor M. Lopez-Hirata

CHARACTERIZATION OF MINERALS, METALS, AND MATERIALS　487-494　2012
Fractional derivative–based mass and heat transport model for evaluation of the effect of water injection in geothermal reservoirs

Suzuki Anna, Makita Hiroshi, Niibori Yuichi, Hashida Toshiyuki

Proceedings of the 13th Korea-Japan Students Symposium　2012
Fabrication of a Si-PZT hybrid XY-microstage with CNT-carbon hinges

Liang He, Masaya Toda, Yusuke Kawai, Mohd Faizul Sarbi, Mamoru Omori, Toshiyuki Hashida, Takahito Ono

IEEJ Transactions on Sensors and Micromachines　132　(11)　425-426　2012

DOI： 10.1541/ieejsmas.132.425 　

ISSN： 1341-8939

eISSN： 1347-5525
Young’s modulus of MWCNT-Carbon cantilevered microstructure

Liang He, Masaya Toda, Yusuke Kawai, Mamoru Omori, Toshiyuki Hashida, Takahito Ono

Proceeding of international Conference on Micro and Nano Engineering　173-173　2012/01
Influence of the structure of the nanotube on the mechanical properties of binder-free multi-walled carbon nanotube solids Peer-reviewed

Yoshinori Sato, Hikaru Nishizaka, Shunichi Sawano, Atsushi Yoshinaka, Kazutaka Hirano, Shinji Hashiguchi, Takayuki Arie, Seiji Akita, Go Yamamoto, Toshiyuki Hashida, Hisamichi Kimura, Kenichi Motomiya, Kazuyuki Tohji

CARBON　50　(1)　34-39　2012/01

DOI： 10.1016/j.carbon.2011.07.047 　

ISSN： 0008-6223
Water Saturation Dependence on CO2 Sorption Potential of Sandstones Peer-reviewed

Takashi Fujii, Kaori Endo, Satomi Nakagawa, Yoshiyuki Sato, Hiroshi Inomata, Shinsuke Nakao, Toshiyuki Hashida

Natural Resources　3　(2)　48-55　2012

DOI： 10.4236/nr.2012.32008 　
Characterization of Tracer Responses Using Fractional Derivative-Based Mathematical Model and Its Application to Prediction of Mass Transport in Fractured Reservoirs Peer-reviewed

Anna Suzuki, Hiroshi Makita, Yuichi Niibori, Sergei A. Fomin, Vladimir A. Chugunov, Toshiyuki Hashida

Geothermal Resources Council Transactions　36　1391-1396　2012
A comparative study of NiO-Ce0.9Gd0.1O1.95 nanocomposite powders synthesized by hydroxide and oxalate co-precipitation methods Peer-reviewed

Changsheng Ding, Kazuhisa Sato, Junichiro Mizusaki, Toshiyuki Hashida

CERAMICS INTERNATIONAL　38　(1)　85-92　2012/01

DOI： 10.1016/j.ceramint.2011.06.041 　

ISSN： 0272-8842
Mechanical properties of Ni-YSZ cermet anode under SOFC operating condition by using in-situ mechanical testing method Peer-reviewed

Satoshi Watanabe, Kazuhisa Sato, Shinji Sukinou, Fumitada Iguchi, Keiji Yashiro, Koji Amezawa, Hiroo Yugami, Toshiyuki Hashida, Junichiro Mizusaki, Tatsuya Kawada

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A　78　(787)　349-360　2012

DOI： 10.1299/kikaia.78.349 　

ISSN： 0387-5008
Effects of surface modification of carbon nanotube on the mechanical properties of multi-walled carbon nanotube/alumina composites Peer-reviewed

Go Yamamoto, Keiichi Shirasu, Yo Nozaka, Mamoru Omori, Toshiyuki Takagi, Toshiyuki Hashida

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A　78　(790)　843-854　2012

DOI： 10.1299/kikaia.78.843 　

ISSN： 0387-5008
THE DESIGN AND DEVELOPMENT OF AN EVALUATION SYSTEM FOR REDOX CHARACTERISTICS OF ANODE SUPPORTED SOFCS USING IN-SITU ACOUSTIC EMISSION AND ELECTROCHEMICAL TECHNIQUE Peer-reviewed

S. Hashimoto, H. Watanabe, T. Sakamoto, T. Kawada, K. Yashiro, J. Mizusaki, K. Kumada, D. Changsheng, K. Sato, T. Hashida

PROCEEDINGS OF THE ASME 10TH FUEL CELL SCIENCE, ENGINEERING, AND TECHNOLOGY CONFERENCE, 2012　519-523　2012
SOFCの機械的信頼性・耐久性向上に向けたその場観察手法開発

井口史匡, 佐藤一永, 島崎知実, 尾澤伸樹, 寺田賢二郎, 橋田俊之, 湯上浩雄, 八代圭司, 坂本正, 宇根本篤, 水崎純一郎, 橋本真一, 渡辺智, 雨澤浩史, 川田達也

第20回SOFC研究発表会予稿集　144-147　2011/12
Nanotube fracture during the failure of carbon nanotube/alumina composites Peer-reviewed

Go Yamamoto, Keiichi Shirasu, Toshiyuki Hashida, Toshiyuki Takagi, Ji Won Suk, Jinho An, Richard D. Piner, Rodney S. Ruoff

CARBON　49　(12)　3709-3716　2011/10

DOI： 10.1016/j.carbon.2011.04.022 　

ISSN： 0008-6223
Synthesis of La0.8Sr0.2Co0.8Fe0.2O3 Nanopowders and Their Application in Solid Oxide Fuel Cells Peer-reviewed

Changsheng Ding, Hongfei Lin, Kazuhisa Sato, Toshiyuki Hashida

JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY　8　(5)　132002-1-132002-14　2011/10

DOI： 10.1115/1.4004176 　

ISSN： 1550-624X
Synthesis of La0.8Sr0.2Co0.8Fe0.2O3 Nanopowders and Their Application in Solid Oxide Fuel Cells Peer-reviewed

Changsheng Ding, Hongfei Lin, Kazuhisa Sato, Toshiyuki Hashida

JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY　8　(5)　051016-1-051016-4　2011/10

DOI： 10.1115/1.4004176 　

ISSN： 1550-624X
High Aspect Ratio Carbon Nanotube-Carbon Composite Microstructures Fabricated by Silicon Molding Technique Peer-reviewed

Liang He, Masaya Toda, Yusuke Kawai, Mamoru Omori, Toshiyuki Hashida, Takahito Ono

「センサ・マイクロマシンと応用システム」シンポジウム論文集　28　371-374　2011/09/26
High Aspect Ratio Carbon Nanotube-Carbon Composite Microstructures

Liang He, Masaya Toda, Yusuke Kawai, Mamoru Omori, Toshiyuki Hashida, Takahito Ono

センサ・マイクロマシンと応用システムシンポジウム　28　134-137　2011/09
Investigation on CNT/alumina interface properties using molecular mechanics simulations Peer-reviewed

Sen Liu, Ning Hu, Go Yamamoto, Yindi Cai, Yajun Zhang, Yaolu Liu, Yuan Li, Toshiyuki Hashida, Hisao Fukunaga

CARBON　49　(11)　3701-3704　2011/09

DOI： 10.1016/j.carbon.2011.04.059 　

ISSN： 0008-6223
Measurements of the phase transition and the average length of the density fluctuation under supercritical fluid using micromechanical resonators Peer-reviewed

Masaya Toda, Takashi Fujii, Atsushi Yoshida, Toshiyuki Hashida, Takahito Ono

Applied Physics Letters　99　(7)　074101-1-074101-3　2011/08/15

DOI： 10.1063/1.3610942 　

ISSN： 0003-6951
Boron-Assisted Transformation to Rod-Like Graphitic Carbons from Multi-Walled Carbon Nanotubes in Boron-Mixed Multi-Walled Carbon Nanotube Solids Peer-reviewed

Yoshinori Sato, Hikaru Nishizaka, Kenichi Motomiya, Go Yamamoto, Akira Okubo, Hisamichi Kimura, Mikio Ishikuro, Kazuaki Wagatsuma, Toshiyuki Hashida, Kazuyuki Tohji

ACS APPLIED MATERIALS & INTERFACES　3　(7)　2431-2439　2011/07

DOI： 10.1021/am200335n 　

ISSN： 1944-8244
FABRICATION OF HIGH ASPECT RATIO CARBON NANOTUBE-CARBON COMPOSITE MICROSTRUCTURES BASED ON SILICON MOLDING TECHNIQUE

Liang He, Masaya Toda, Yusuke Kawai, Hidetoshi Miyashita, Chuanyu Shao, Mamoru Omori, Toshiyuki Hashida, Takahito Ono

The 16th International Conference on Solid-State Sensors, Actuators and Microsystems　16　2331-2334　2011/06

DOI： 10.1109/TRANSDUCERS.2011.5969549 　
Synthesis and evaluation of NiO-Ce0.8Sm0.2O1.9 nanocomposite powders for low-temperature solid oxide fuel cells Peer-reviewed

Changsheng Ding, Toshiyuki Hashida

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　36　(9)　5567-5573　2011/05

DOI： 10.1016/j.ijhydene.2011.02.073 　

ISSN： 0360-3199
Ionic Conductivity in Uniaxial Micro Strain/Stress Fields of Yttria-Stabilized Zirconia Peer-reviewed

Kazuhisa Sato, Ken Suzuki, Ryo Narumi, Keiji Yashiro, Toshiyuki Hashida, Junichiro Mizusaki

JAPANESE JOURNAL OF APPLIED PHYSICS　50　(5)　055803-1-055803-5　2011/05

DOI： 10.1143/JJAP.50.055803 　

ISSN： 0021-4922
Co-Precipitation Synthesis and Characterization of NiO-Ce0.8Sm0.2O1.9 Nanocomposite Powders: Effect of Precipitation Agents Peer-reviewed

Changsheng Ding, Hongfei Lin, Kazuhisa Sato, Toshiyuki Hashida

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY　11　(3)　2336-2343　2011/03

DOI： 10.1166/jnn.2011.3122 　

ISSN： 1533-4880
Non-Fickian mass transport in fractured porous media Peer-reviewed

Sergei A. Fomin, Vladimir A. Chugunov, Toshiyuki Hashida

ADVANCES IN WATER RESOURCES　34　(2)　205-214　2011/02

DOI： 10.1016/j.advwatres.2010.11.002 　

ISSN： 0309-1708

eISSN： 1872-9657
Synthesis of La0.8Sr0.2Co0.8Fe 0.2O3 nanopowders and their application in solid oxide fuel cells Peer-reviewed

Changsheng Ding, Hongfei Lin, Kazuhisa Sato, Toshiyuki Hashida

IOP Conference Series: Materials Science and Engineering　18　2011

DOI： 10.1088/1757-899X/18/13/132002 　

ISSN： 1757-8981 1757-899X
EVALUATION OF THERMAL AGING EMBRITTLEMENT OF AUSTENITIC STAINLESS STEELS JN1, JJ1 AND JK2 STEELS BY CRYOGENIC SMALL-PUNCH TESTING Peer-reviewed

Maribel L-Saucedo-Munoz, Shin-Ichi Komazaki, Toshiyuki Hashida, Victor M. Lopez-Hirata

EPD CONGRESS 2011　127-134　2011
Mechanical Properties of La0.6Sr0.4Co0.2Fe0.8O3-d under Various Temperatures and Oxygen Partial Pressures Peer-reviewed

Y. Kimura, T. Kushi, S. Hashimoto, S. Watanabe, K. Amezawa, T. Kawada, Y. Fukuda, A. Unemoto, K. Sato, K. Yashiro, J. Mizusaki, T. Hashida

Electrochemical Society Transactions,　35　(1)　2429-2934　2011
Preparation of carbon nanotube reinforced alumina composites and examination of their fracture mechanisms Peer-reviewed

Keiichi Shirasu, Go Yamamoto, Mamoru Omori, Toshiyuki Takagi, Toshiyuki Hashida

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A　77　(779)　1041-1045　2011

DOI： 10.1299/kikaia.77.1041 　

ISSN： 0387-5008
Evaluation of Crack Bridging Characteristics in Carbon Nanotube/Alumina Composites Using Single Fiber Pullout Testing Method Peer-reviewed

Go Yamamoto, Keiichi Shirasu, Toshiyuki Takagi, Toshiyuki Hashida

Transactions of the Japan Society of Mechanical Engineers A　77　(777)　779-783　2011
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.77.779 　

ISSN： 0387-5008

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The crack bridging behavior of multi-walled carbon nanotube-reinforced alumina matrix composites has been investigated using a single fiber pullout testing method. Contradictory to the conventional understanding (which have reported that pullout phenomena evidently occurred in the bulk nanotube-reinforced alumina composites), the pullout experiments using an in situ SEM method with a nanomanipulator system demonstrated that strong load transfer was revealed, and no pullout behavior was observed for all 15 MWCNTs. The MWCNTs, rather than pulling out from the alumina matrix, broke in the outer-shells and the inner section was pulled away, leaving the outer-shells of the fragment in the matrix. This implies that tougher ceramics with MWCNT can be obtained by creating the appropriate interaction between the matrix and MWCNT: not too week but also not too strong to permit an adequate load transfer between the two parts and thus a consequent pulling out without breakage of MWCNT. Our finding suggests important implications for the design of tougher ceramic composites with MWCNTs. The important factor for such tougher ceramic composites will thus be the use of 'strong' MWCNTs having higher mechanical performance (as well as a good dispersion in the matrix).
Effect of Surface Modification of Carbon Nanotube on the Strength Properties of Carbon Nanotube/Alumina Composites and Their Fracture Process Peer-reviewed

Keiichi Shirasu, Go Yamamoto, Mamoru Omori, Yoichi Aizawa, Toshiyuki Hashida

Transactions of the Japan Society of Mechanical Engineers A　77　(777)　774-778　2011
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.77.774 　

ISSN： 0387-5008

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We report the mechanical properties and microstructures of multi-walled carbon nanotube (MWCNT)/alumina composites made with MWCNTs that absorb negatively charged functional groups at the MWCNT ends and along their length from an acid treatment. We conducted the fracture surface observations of the composites, in order to evaluate the effects of the acid treatment conditions of MWCNTs on the mechanical properties of the composites and the microstructures such as dispersibility and protrusion length of MWCNTs. According to the SEM observations, it was found that the dispersibility of MWCNTs affected the mechanical properties of the composites, and the protrusion length of MWCNTs decreased with increasing of the acid treatment time of MWCNTs. These observations revealed that the high structural homogeneity rather than pullout behavior of MWCNTs leads to an increase in the mechanical properties of the MWCNT/alumina composite. There is an optimal acid treatment time for improving the mechanical properties of the composites. The dispersibility of the MWCNTs and mechanical properties of the composites was increased by the acid treatment with treated for 2 hours compared to the pristine MWCNTs and acid treatment MWCNTs with treated for 0, 0.5, 1, 3 and 4 hours.
Simple and rapid preparation of Ce0.9Gd0.1O1.95 electrolyte films for anode-supported solid oxide fuel cells Peer-reviewed

Changsheng Ding, Hongfei Lin, Kazuhisa Sato, Toshiyuki Hashida

SURFACE & COATINGS TECHNOLOGY　205　(8-9)　2813-2817　2011/01

DOI： 10.1016/j.surfcoat.2010.10.051 　

ISSN： 0257-8972
y Mechanical Properties of La0.6Sr0.4Co1-yFeyO3-delta under Various Temperatures and Oxygen Partial Pressures Peer-reviewed

Y. Kimura, T. Kushi, S. Hashimoto, S. Watanabe, K. Amezawa, T. Kawada, Y. Fukuda, A. Unemoto, K. Sato, K. Yashiro, J. Mizusaki, T. Hashida

SOLID OXIDE FUEL CELLS 12 (SOFC XII)　35　(1)　2429-2434　2011

DOI： 10.1149/1.3570240 　

ISSN： 1938-5862
Multiscale Simulation of Electro-Chemo-Mechanical Coupling Behavior of PEN Structure under SOFC Operation Peer-reviewed

K. Terada, T. Kawada, K. Sato, F. Iguchi, K. Yashiro, K. Amezawa, M. Kubo, H. Yugami, T. Hashida, J. Mizusaki, H. Watanabe, T. Sasagawa, H. Aoyagi

SOLID OXIDE FUEL CELLS 12 (SOFC XII)　35　(1)　923-933　2011

DOI： 10.1149/1.3570073 　

ISSN： 1938-5862
Effect of Redox Cycling on Mechanical Properties of Ni-YSZ Cermets for SOFC Anodes Peer-reviewed

S. Sukino, S. Watanabe, K. Sato, F. Iguchi, H. Yugami, T. Kawada, J. Mizusaki, T. Hashida

SOLID OXIDE FUEL CELLS 12 (SOFC XII)　35　(1)　1473-1482　2011

DOI： 10.1149/1.3570133 　

ISSN： 1938-5862
In situ Observation of the Deformation and Mechanical Damage of SOFC Cell/Stack Peer-reviewed

K. Sato, T. Sakamoto, A. Kaimai, K. Yashiro, K. Amezawa, T. Hashida, J. Mizusaki, T. Kawada

SOLID OXIDE FUEL CELLS 12 (SOFC XII)　35　(1)　225-229　2011

DOI： 10.1149/1.3569997 　

ISSN： 1938-5862
Cooperative Investigations on Degradation of Cathode Materials in Segment-in-Series Cells by MHI Peer-reviewed

Harumi Yokokawa, Haruo Kishimoto, Katsuhiko Yamaji, Teruhisa Horita, Takao Watanabe, Tohru Yamamoto, Koichi Eguchi, Toshiaki Matsui, Kazunari Sasaki, Yusuke Shiratori, Tatsuya Kawada, Kazuhisa Sato, Toshiyuki Hashida, Atsushi Unemoto, Tatsuo Kabata, Kazuo Tomida

SOLID OXIDE FUEL CELLS 12 (SOFC XII)　35　(1)　2191-2200　2011

DOI： 10.1149/1.3570212 　

ISSN： 1938-5862
Mechanical properties evaluation method for non-stoichiometric materials under high temperature and oxidizing/reducing conditions Peer-reviewed

Satoshi Watanabe, Kazuhisa Sato, Yohei Takeyama, Fumitada Iguchi, Keiji Yashiro, Koji Amezawa, Hiroo Yugami, Toshiyuki Hashida, Junichiro Mizusaki, Tatsuya Kawada

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A　77　(780)　1357-1366　2011

DOI： 10.1299/kikaia.77.1357 　

ISSN： 0387-5008
Mathematical Modeling of Anomalous Diffusion in Porous Media Peer-reviewed

Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida

Fractional Differential Calculus　1　(1)　1-28　2011
Effect of thickness of Gd0.1Ce0.9O1.95 electrolyte films on electrical performance of anode-supported solid oxide fuel cells Peer-reviewed

Changsheng Ding, Hongfei Lin, Kazuhisa Sato, Koji Amezawa, Tatsuya Kawada, Junichiro Mizusaki, Toshiyuki Hashida

JOURNAL OF POWER SOURCES　195　(17)　5487-5492　2010/09

DOI： 10.1016/j.jpowsour.2010.03.075 　

ISSN： 0378-7753

eISSN： 1873-2755
Fracture process of nonstoichiometric oxide based solid oxide fuel cell under oxidizing/reducing gradient conditions Peer-reviewed

Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Hiroo Yugami, Toshiyuki Hashida, Junichiro Mizusaki

JOURNAL OF POWER SOURCES　195　(17)　5481-5486　2010/09

DOI： 10.1016/j.jpowsour.2010.03.077 　

ISSN： 0378-7753
Improvement of electrochemical performance of anode-supported SOFCs by NiO-Ce0.9Gd0.1O1.95 nanocomposite powders Peer-reviewed

Changsheng Ding, Hongfei Lin, Kazuhisa Sato, Tatsuya Kawada, Junichiro Mizusaki, Toshiyuki Hashida

SOLID STATE IONICS　181　(25-26)　1238-1243　2010/08

DOI： 10.1016/j.ssi.2010.06.037 　

ISSN： 0167-2738
Molecular mechanics simulation of the sliding behavior between nested walls in a multi-walled carbon nanotube Peer-reviewed

Yuan Li, Ning Hu, Go Yamamoto, Zhongchang Wang, Toshiyuki Hashida, Hiroshi Asanuma, Chensong Dong, Tomonaga Okabe, Masahiro Arai, Hisao Fukunaga

CARBON　48　(10)　2934-2940　2010/08

DOI： 10.1016/j.carbon.2010.04.031 　

ISSN： 0008-6223
The influence of nanoscale defects on the fracture of multi-walled carbon nanotubes under tensile loading Peer-reviewed

Go Yamamoto, Ji Won Suk, Jinho An, Richard D. Piner, Toshiyuki Hashida, Toshiyuki Takagi, Rodney S. Ruoff

DIAMOND AND RELATED MATERIALS　19　(7-9)　748-751　2010/07

DOI： 10.1016/j.diamond.2010.01.045 　

ISSN： 0925-9635
Effects of titanium surface treatment on adhesive properties of hydroxyapatite ceramics coating to titanium substrates by double layered capsule hydrothermal hot-pressing Peer-reviewed

Takamasa Onoki, Tomoaki Kuno, Atsushi Nakahira, Toshiyuki Hashida

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN　118　(1378)　530-534　2010/06

DOI： 10.2109/jcersj2.118.530 　

ISSN： 1882-0743

eISSN： 1348-6535
A simple, rapid spray method for preparing anode-supported solid oxide fuel cells with GDC electrolyte thin films Peer-reviewed

Changsheng Ding, Hongfei Lin, Kazuhisa Sato, Toshiyuki Hashida

JOURNAL OF MEMBRANE SCIENCE　350　(1-2)　1-4　2010/03

DOI： 10.1016/j.memsci.2009.12.013 　

ISSN： 0376-7388
J0802-4-4 Development of a gas environment controlled materials testing system for SOFCs

WATANABE Satoshi, SATO Kazuhisa, TAKEYAMA Yohei, SUKINOU Shinji, AMEZAWA Koji, HASHIDA Toshiyuki, KAWADA Tatsuya

The proceedings of the JSME annual meeting　2010　235-236　2010
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2010.7.0_235 　

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The objective of this work is to study relationship between oxygen potential and mechanical properties of an oxygen nonstoichiometric compound with Ce_<0.9>Gd_<0.1>O_<2-δ> Under high temperatures and reducing conditions, oxygen content in Ce_<0.9>Gd_<0.1>O_<2-δ> changes and oxygen defects are generated. Therefore Mechanical properties of Ce_<0.9>Gd_<0.1>0_<2-δ> can change under such conditions. In this study, we developed a new testing apparatus for small punch test, which is able to measure mechanical properties under high temperatures and controlled atmospheric conditions. The fracture stress Ce_<0.9>Gd_<0.1>O_<2-δ> was almost constant regardless of oxygen partial pressure, while elastic modulus decreased with decreasing oxygen partial pressure in reducing atmospheres. Elastic modulus relates oxygen vacancy concentration.
J0802-4-3 Investigation of Mechanical Properties of La_<0.6>Sr_<0.4>Co_<0.2>Fe_<0.8>O_<3-δ> at High Temperatures in Controlled Atmospheres Using Resonance Method

KIMURA Yuta, KUSHI Takuto, WATANABE Satoshi, SATO Kazuhisa, UNEMOTO Atsushi, AMEZAWA Koji, HASHIDA Toshiyuki, KAWADA tatuya

The proceedings of the JSME annual meeting　2010　233-234　2010
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2010.7.0_233 　

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This paper examined mechanical properties, Young's modulus, shear modulus, Poisson's ratio and internal friction, of La_<0.6>Sr_<0.4>Co_<0.2>Fe_<0.8>O_<3-δ> in the temperature range between 298 and 1173 K, and the oxygen partial pressure (P(O_2)) range between 0.1 and 10^<-4> bar by using resonance method. The Young's modulus of La_<0.6>Sr_<0.4>Co_<0.2>Fe_<0.8>O_<3-δ> gradually decreased in the temperature range between 298 and 823 K and then drastically increased above 873 K. P(0_2) dependencies of Young's modulus showed different trends depending on temperature. At 1173K, Young's modulus decreased with decreasing P(O_2), while increased down to 5.0×10^<-3> bar and then decreased with decreasing P(O_2) at 1073K. At 973K, it monotonically increased with decreasing P(O_2), and at 873K, slightly increased with decreasing P(O_2).
J0802-4-5 Effect of Redox cycling on mechanical properties of Ni-YSZ for SOFC anodes

SUKINO Shinji, Ding Changsheng, WATANABE Satoshi, SATO Kazuhisa, KAWADA Tatsuya, HASHIDA Toshiyuki

The proceedings of the JSME annual meeting　2010　237-238　2010
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2010.7.0_237 　

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Effects of redox cycling on the mechanical properties of Ni-YSZ composites were investigated by using a Small Punch(SP) testing method. The compositions of the Ni-YSZ composites tested in this study were 0:100 vol. %, 15:85 vol. %, 30:70vol. %, and 50:50 vol. %. Electrical conductivity measurements suggested that the Ni particles formed a network-like structure at the Ni content greater than 30 vol. %. Experimental results obtained from the SP tests demonstrated that ductile-like deformation was induced under a reducing environment (at oxygen partial pressure 1 × 10^<-18>atm) for the Ni contents of 30 and 50 vol. %. The ductile-like behavior could be attributed to the formation of Ni network. The first complete re-oxidation of Ni-YSZ composites then caused critical damage and resulted in a drastic strength reduction, probably due to Ni agglomeration. This study revealed the first evidence for the presence of potential plastic deformation capacity in Ni-YSZ composites under reducing environment.
Reinforcement of Alumina with Surface Modified Carbon Nanotubes Peer-reviewed

Go Yamamoto, Toshiyuki Hashida, Mamoru Omori, Hisamichi Kimura

MULTISCALE, MULTIFUNCTIONAL AND FUNCTIONALLY GRADED MATERIALS　631-632　231-+　2010

DOI： 10.4028/www.scientific.net/MSF.631-632.231 　

ISSN： 0255-5476
Application of Fractional Differential Equations for Modeling the Anomalous Diffusion of Contaminant from Fracture into Porous Rock Matrix with Bordering Alteration Zone Peer-reviewed

Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida

TRANSPORT IN POROUS MEDIA　81　(2)　187-205　2010/01

DOI： 10.1007/s11242-009-9393-2 　

ISSN： 0169-3913

eISSN： 1573-1634
A novel structure for carbon nanotube reinforced alumina composites effects of sintering additives on the mechanical properties Peer-reviewed

Go Yamamoto, Mamoru Omori, Yoichi Aizawa, Toshiyuki Hashida, Toshiyuki Takagi

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A　76　(764)　416-418　2010
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.76.416 　

ISSN： 0387-5008
Low-Temperature Anode-Supported SOFC with Ultra-Thin Ceria-Based Electrolytes Prepared by Modified Sol-Gel Route Peer-reviewed

Hongfei Lin, Changsheng Ding, Kazuhisa Sato, Yoshifumi Tsutai, Toshiyuki Hashida

Journal of Solid Mechanics and Materials Engineering　4　(2)　335-343　2010
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jmmp.4.335 　

ISSN： 1880-9871

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The utilization of anode-supported electrolytes is a very promising strategy to improve the electrical performance in solid oxide fuel cells (SOFCs) application, because it is possible to decrease considerably the electrolytes thickness. In this paper, ultra-thin ceria-based electrolyte films were successfully prepared on porous NiO/GDC anode support. The electrolyte films with thickness of 0.5-1 µm were deposited by a novel citrate sol-gel route combined with a suspension spray coating technique. The characterization and microstructure of the ultra-thin films were investigated by DTA/TGA, XRD and FE-SEM. The results showed that ceria-based films prepared were pure fluorite type nanocrystalline, homogenous and almost fully dense. Electrochemical performance of single cells based on the ultra-thin electrolyte films was also tested. The single cell with electrolyte thickness of 1 µm provided an OCV of 0.832 V at 500 °C which was close to that of the reported single cell with thicker ceria-based electrolyte film of 10 µm, and maximum power densities of 59.6, 121.9 and 133.8 mW/cm² at 500, 600, and 700 °C, respectively. These ultra-thin electrolyte films showed good combination with the porous NiO/GDC anode supports, and good insulating ability for inactive electron migration at temperatures less than 600 °C.
Preparation and Characterization of Ce_0.9Gd_0.1O_1.95 Electrolyte Films by Spray Coating Process Peer-reviewed

Changsheng Ding, Hongfei Lin, Kazuhisa Sato, Yoshifumi Tsutai, Mabito Iguchi, Toshiyuki Hashida

Journal of Solid Mechanics and Materials Engineering　4　(2)　325-333　2010
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jmmp.4.325 　

ISSN： 1880-9871

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Anode-supported solid oxide fuel cells (SOFCs) have attracted extensive attention due to low operating temperatures and high electrical performance. In the anodesupported SOFCs, the key is to prepare dense electrolyte films on porous anode substrates. In this study, a simple and cost-effective technique, spray coating process, is introduced to prepare dense electrolyte films. In the spray coating process, the preparation of powder suspension is very important, which affects the quality of resulting electrolyte films. A well-dispersed Ce_0.9Gd_0.1O_1.95 (GDC) suspension were prepared in isopropyl alcohol by adding 2 mass% surfactant. Using the well-dispersed GDC suspension, dense and crack-free GDC electrolyte films with thickness of 2-10 µm were successfully prepared on porous NiO-GDC anode substrates by the spray coating process. In order to evaluate the GDC electrolyte film as electrolyte for SOFC, anode-supported SOFC was fabricated and its electrical performance was measured. Results show that the GDC electrolyte film prepared by the spray coating process can be used as electrolyte of SOFC. The GDC electrolyte film is well adhered to the anode substrate, and there is no crack and delamination observed after electrical performance test.
Effects of Sintering Additive on Mechanical Properties of Alumina Matrix Composites Reinforced with Carbon Nanotubes Peer-reviewed

G. Yamamoto, M. Omori, T. Hashida, H. Kimura, T. Takagi

Journal of Solid Mechanics and Materials Engineering　4　(3)　460-469　2010
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jmmp.4.460 　

ISSN： 1880-9871

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Carbon nanotube is nature's smallest fiber and predicted to have a range of unusual mechanical and electrical properties. One possible route to harnessing these properties for applications would be to incorporate nanotubes in a composite material. Here, we report the mechanical properties of multi-walled carbon nanotube (MWCNT) reinforced alumina composites made with a pristine MWCNT and an acid-treated version that have nanoscale defects on their surfaces from an acid treatment. It was demonstrated that surface modification of the MWCNT is effective in improvement of bending strength and fracture toughness of the MWCNT-reinforced alumina composites. On the basis of the results, we also prepared three sets of the acid-treated MWCNT-reinforced alumina composites having different sintering additives, in order to investigate the effects of sintering additives on their microstructures and mechanical properties. Mechanical properties of the composites were dependent mostly on the type of sintering additives and amount of MWCNT. The 0.9 vol.% acid-treated MWCNT-reinforced alumina composites with MgO sintering additive gave the highest bending strength (689.6 ± 29.1 MPa) and fracture toughness (5.90 ± 0.27 MPa·m^1/2), respectively.
Investigation of CO₂ sorption behavior in rocks for CO₂ geological storage Peer-reviewed

T. Fujii, H. Lin, Y. Sato, Y. Sugai, K. Sasaki, H. Inomata, T. Hashida

Journal of MMIJ　126　(3)　84-94　2010
Publisher: The Mining and Materials Processing Institute of Japan
DOI： 10.2473/journalofmmij.126.84 　

ISSN： 1881-6118

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Sorption isotherms, which describe CO₂ storage capacity of rocks, are important for estimating CO₂ sequestration potential of geological reservoirs. This study examined CO₂ sorption capacity of Kimachi sandstone and Iidate granite in the CO₂ rich dense phase, the condition of which is expected to occur mostly in the course of CO₂ injection into geological reservoirs because of the displacement of formation water by CO₂ pressurization in geological reservoirs as storing CO₂ into aquifers, at geological temperature and pressure. CO₂ sorption measurements were conducted using both volumetric and gravimetric methods at temperatures of 33∼200°C and pressures up to 20MPa. It was found that Kimachi sandstone and Iidate granite were capable of sorbing CO₂ into their internal structures. At 50°C, the amount of CO₂ sorption reached the maximum value of 1.4 mmol/g (= 31.4 scc/g) for Kimachi sandstone and 0.7 mmol/g (=15.7 scc/g) for Iidate granite, respectively. Comparison among model predictions (monolayer adsorption, solubility and pore-filling) suggests that the sorption of CO₂ onto rock minerals may contribute to a significant portion of the CO₂ storage capacity in the course of CO₂ injection. This investigation points out the significance of CO₂ sorption onto rock minerals for the possible mechanism in CO₂ geological storage.
Sorption behavior of CO₂ on rocks and minerals in CO₂ rich dense phase Peer-reviewed

T. Fujii, S. Nakagawa, Y. Sato, H. Inomata, T. Hashida

Journal of MMIJ　126　(10)　554-559　2010
Publisher: The Mining and Materials Processing Institute of Japan
DOI： 10.2473/journalofmmij.126.554 　

ISSN： 1881-6118

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Evaluation of CO₂ storage capacity in water saturated reservoir rocks is very complex because various trapping mechanisms that act at different rates are involved and, at times, all mechanisms may be operating simultaneously. Thus, in terms of the water saturated reservoir rocks, a reliable estimate of CO₂ storage capacity requires a thorough understanding of the mechanisms of CO₂ trapping in this system. The objective of this study is to provide a fundamental knowledge about interactions among CO₂, water and rock, and contributes to development of standards for CO₂ storage capacity estimation in the water saturated reservoir rocks. In this experiment, CO₂ sorption was measured for rock samples (quartzose arenite, greywacke, shale, granite and serpentine) , and mineral samples (quartz and albite) in a CO₂ rich dense phase at 50ºC and 100ºC, and pressures up to 20MPa, the condition of which is expected to occur mostly during CO₂ injection into pores of the water saturated reservoir rocks. The result obtained from the experiment exhibited a significant sorption capacity of CO₂ on all of the samples. At 50ºC and 100ºC, quartzose arenite indicated largest sorption capacity among the other samples in higher pressures (>10 MPa) . Furthermore, comparison with model prediction based on the pore filling model, which assumed that pores of the rocks and minerals will be filled with CO₂, suggested the importance of the sorption mechanism in the CO₂ geological storage in addition to the pore-filling mechanism. The present results indicate that the sorption process may have significant and meaningful effect on the assessment of CO₂ storage capacity in geological media.
CO₂ sorption characteristics of rocks and minerals in storing CO₂ processes Peer-reviewed

T. Fujii, S. Nakagawa, Y. Sato, H. Inomata, T. Hashida

Natural Resources　1　1-10　2010
High performance anode-supported solid oxide fuel cell based on thin-film electrolyte and nanostructured cathode Peer-reviewed

Changsheng Ding, Toshiyuki Hashida

ENERGY & ENVIRONMENTAL SCIENCE　3　(11)　1729-1731　2010

DOI： 10.1039/c0ee00255k 　

ISSN： 1754-5692
Anode-supported SOFCs with Electrolyte Thin Films Prepared by Spray Coating Peer-reviewed

Changsheng Ding, Hongfei Lin, Kazuhisa Sato, Yoshifumi Tsutai, Mabito Iguchi, Toshiyuki Hashida

MULTISCALE, MULTIFUNCTIONAL AND FUNCTIONALLY GRADED MATERIALS　631-632　319-+　2010

DOI： 10.4028/www.scientific.net/MSF.631-632.319 　

ISSN： 0255-5476
Characterizing Non-Fickian Transport in Fractured Rock Masses Using Fractional Derivative-Based Mathematical Model Peer-reviewed

Anna Suzuki, Ryuichi Chiba, Takashi Okaze, Yuichi Niibori, Sergei Fomin, Vladimir Chugnov, Toshiyuki Hashida

GRC Transactions　34　1179-1184　2010
DEVELOPMENT OF IN-SITU MECHANICAL TESTING METHOD FOR SOFC COMPONENTS Peer-reviewed

Satoshi Watanabe, Kazuhisa Sato, Yohei Takeyama, Fumitada Iguchi, Keiji Yashiro, Toshiyuki Hashida, Junichiro Mizusaki, Tatsuya Kawada

PROCEEDINGS OF THE ASME 8TH INTERNATIONAL CONFERENCE ON FUEL CELL SCIENCE, ENGINEERING, AND TECHNOLOGY 2010, VOL 2　417-420　2010

DOI： 10.1115/FuelCell2010-33294 　
Development of fractional derivative–based mass transport model for evaluation of complex crustal fluid flow Peer-reviewed

Anna Suzuki, Ryoichi Chiba, Takashi Okaze, Toshiyuki Hashida

Proceedings of International Symposium on Renewable Energy 2010　in CD ROM　2010
Effect of Y2O3 addition on the conductivity and elastic modulus of (CeO2)(1-x)(YO1.5)(x) Peer-reviewed

Kazuhisa Sato, Ken Suzuki, Keiji Yashiro, Tatsuya Kawada, Hiroo Yugami, Toshiyuki Hashida, Alan Atkinson, Junichiro Mizusaki

SOLID STATE IONICS　180　(20-22)　1220-1225　2009/08

DOI： 10.1016/j.ssi.2009.06.003 　

ISSN： 0167-2738

eISSN： 1872-7689
Synthesis of Dense and Pinhole-free Y-zeolite for Separation Membrane Using a Modified Hydrothermal Method Peer-reviewed

Atsushi Nakahira, Hidezumi Nagata, Takamasa Onoki, Yuki Yamasaki, Toshiyuki Hashida

CHEMISTRY LETTERS　38　(6)　608-609　2009/06

DOI： 10.1246/cl.2009.608 　

ISSN： 0366-7022

eISSN： 1348-0715
Preparation and characterization of lanthanum carbide encapsulated carbon nanocapsule/lanthanum hexaboride nanocomposites Peer-reviewed

Masaru Namura, Ippei Waki, Yoshinori Sato, Go Yamamoto, Akira Okubo, Hisamichi Kimura, Naohisa Osaka, Kenichi Motomiya, Toshiyuki Hashida, Balachandran Jeyadevan, Kazuyuki Tohji

MATERIALS LETTERS　63　(15)　1307-1310　2009/06

DOI： 10.1016/j.matlet.2009.03.006 　

ISSN： 0167-577X
Synthesis of NiO-Ce0.9Gd0.1O1.95 nanocomposite powders for low-temperature solid oxide fuel cell anodes by co-precipitation Peer-reviewed

Changsheng Ding, Hongfei Lin, Kazuhisa Sato, Toshiyuki Hashida

SCRIPTA MATERIALIA　60　(4)　254-256　2009/02

DOI： 10.1016/j.scriptamat.2008.10.020 　

ISSN： 1359-6462
Chemically-induced stress of fuel cell laminate under oxidizing/reducing gradient condition

Kazuhisa Sato, Keiji Yashiro, Toshiyuki Hashida, Junichiro Mizusaki

ICCM International Conferences on Composite Materials　2009
Publisher: International Committee on Composite Materials
S0305-2-5 Investigation of Degradation Process of SOFC Using AE and EC Method

SATO Kazuhisa, KUMADA Keigo, HASHIDA Toshiyuki, MIZUSAKI Junichiro

The proceedings of the JSME annual meeting　2009　231-232　2009
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2009.1.0_231 　

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SOFCs are a next-generation power generating technology employing hydrogen, and improving their reliability is the most important issue for achieving practical use. In this research, we are conducting studies to ensure overall long-term reliability by examining the interaction of mechanical, electrochemical factors in SOFC in a simulated operating environment. Especially the establishment of a suitable in-situ mechanical damage testing method is a pre-requisite for the development of reliable SOFCs. This paper presents the experimental results of the investigation of mechanical damage under redox cycle conditions.
S0305-3-4 Effects of oxygen potential on mechanical properties of SOFC constituent ceramics

TAKEYAMA Yohei, SATO Kazuhisa, KAWADA Tatsuya, HASHIDA Toshiyuki, MIZUSAKI Junichiro

The proceedings of the JSME annual meeting　2009　239-240　2009
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2009.1.0_239 　

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The objective of this work is to study relationship between oxygen potential and mechanical properties of oxygen nonstoichiometric compound with Ce_<0.9>Gd_<0.1>O_<2-x>. Under high temperature and reducing conditions, oxygen content in Ce_<0.9>Gd_<0.1>O_<2-x> changes and oxygen defect is generated. Therefore Mechanical properties of Ce_<0.9>Gd_<0.1>O_<2-x> can change under such conditions. In our study, we developed new test apparatus for small punch test, which is able to measure mechanical properties under high temperature and reducing conditions. And several tests ran already with this new test apparatus. Advanced investigation would explain how mechanical properties behave in these conditions.
S0305-3-3 Relationship between Nonstoichiometry and Physical Properties of Components for Solid Oxide Fuel Cells

Nakamura Takashi, Takeyama Yohei, Fukuda Yasuhiro, Nakayama Shota, Yashiro Keiji, Hashida Toshiyuki, Mizusaki Junichiro

The proceedings of the JSME annual meeting　2009　237-238　2009
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2009.1.0_237 　

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In this study, Crystal structure and mechanical properties of K_2NiF_4 type oxides were measured by high temperature X-ray diffractometry and in-situ small punch test as a function of oxygen partial pressure, P(O_2) and temperature. Chemically induced volume change was evaluated by nonstoichiometric data and the variation of the lattice constants with P(O_2). The elastic modulus and the fracture strength become larger at higher P(O_2) condition. This may be caused by the structural change due to the variation of oxygen content.
Mathematical modeling of non-Fickian mass transport in fractured porous media Peer-reviewed

Sergei A. Fomin, Vladimir A. Chugunov, Toshiyuki Hashida

Proceedings of SPIE - The International Society for Optical Engineering　7377　2009

DOI： 10.1117/12.837011 　

ISSN： 0277-786X
DERIVATION OF FRACTIONAL DIFFERENTIAL EQUATIONS FOR MODELING DIFFUSION IN POROUS MEDIA OF FRACTAL GEOMETRY Peer-reviewed

Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida

IMECE 2008: HEAT TRANSFER, FLUID FLOWS, AND THERMAL SYSTEMS, VOL 10, PTS A-C　1041-1046　2009
Derivation of fractional differential equations for modeling diffusion in porous media of fractal geometry Peer-reviewed

Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida

ASME International Mechanical Engineering Congress and Exposition, Proceedings　10　1041-1046　2009

DOI： 10.1115/IMECE2008-68499 　
Preparation of Doped Ceria Electrolyte Films for SOFCs by Spray Coating Method Peer-reviewed

Changsheng Ding, Hongfei Lin, Kazuhisa Sato, Yoshifumi Tsutai, Hiromichi Ohtaki, Mabito Iguchi, Chiharu Wada, Toshiyuki Hashida

JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY　30　(2)　241-245　2009

DOI： 10.1080/01932690802501709 　

ISSN： 0193-2691
Preparation and microstructure of carbon nanotube-toughened alumina composites Peer-reviewed

Go Yamamoto, Toshiyuki Hashida, Mamoru Omori, Hisamichi Kimura

Journal of Solid Mechanics and Materials Engineering　3　(2)　85-95　2009
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jmmp.3.85 　

ISSN： 1880-9871

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Engineering ceramics have high stiffness, excellent thermostability and relatively low density, but their brittleness impedes their use as structural materials. Incorporating carbon nanotubes (CNTs) into a brittle ceramic might be expected to produce CNT/ceramic composites with both high toughness and high temperature stability. Until now, however, materials fabrication difficulties have limited research on CNT/ceramic composites. The mechanical failure of CNT/ceramic composites reported previously is primarily attributed to poor CNTs-matrix connectivity and severe phase segregation. The connectivity with, and uniform distribution within the matrix are essential structural requirements for the stronger and tougher CNT/ceramic composites. Here we show that a novel processing approach based on the precursor method for synthesis of Al₂O₃ and acid-treated multi-walled carbon nanotubes (MWCNTs) can diminish the phase segregation, and render MWCNT/Al₂O₃ composites highly homogeneous. Combined with mechanical interlock induced by the chemically modified MWCNTs, this approach leads to improved mechanical properties. Direct toughness measurements, using the single edge notched beam method, reveal that only 0.9 vol.% acid-treated MWCNT addition results in 25% increases in fracture toughness (5.90±0.27 MPa·m^1/2).
Deformation and Fracture Characteristics of Zirconia and Ceria-Based Electrolytes for SOFCs under Reducing Atmospheres Peer-reviewed

T. Hashida, K. Sato, Y. Takeyama, T. Kawada, J. Mizusaki

SOLID OXIDE FUEL CELLS 11 (SOFC-XI)　25　(2)　1565-1572　2009

DOI： 10.1149/1.3205692 　

ISSN： 1938-5862
Oxygen nonstoichiometry, crystal structure and mechanical properties of La2NiO4+δ Peer-reviewed

T. Nakamura, Y. Takeyama, S. Watanabe, K. Yashiro, K. Sato, T. Hashida, J. Mizusaki

ECS Transactions　25　(2)　2573-2580　2009

DOI： 10.1149/1.3205814 　

ISSN： 1938-5862 1938-6737
Classification of Mechanical Failures of SOFC and Strategy for Evaluation of the Operational Margins Peer-reviewed

T. Kawada, S. Watanabe, S. Hashimoto, T. Sakamoto, A. Unemoto, M. Kurumatani, K. Sato, F. Iguchi, K. Yashiro, K. Amezawa, K. Terada, M. Kubo, H. Yugami, T. Hashida, J. Mizusaki

SOLID OXIDE FUEL CELLS 11 (SOFC-XI)　25　(2)　467-472　2009

DOI： 10.1149/1.3205556 　

ISSN： 1938-5862
Preparation and Microstructure of Carbon Nanotube-Toughened Alumina Composites Peer-reviewed

G. Yamamoto, T. Hashida, M. Omori, H. Kimura

Journal of Solid Mechanics and Materials Engineering　3　(2)　85-95　2009
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jmmp.3.85 　

ISSN： 1880-9871

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Engineering ceramics have high stiffness, excellent thermostability and relatively low density, but their brittleness impedes their use as structural materials. Incorporating carbon nanotubes (CNTs) into a brittle ceramic might be expected to produce CNT/ceramic composites with both high toughness and high temperature stability. Until now, however, materials fabrication difficulties have limited research on CNT/ceramic composites. The mechanical failure of CNT/ceramic composites reported previously is primarily attributed to poor CNTs-matrix connectivity and severe phase segregation. The connectivity with, and uniform distribution within the matrix are essential structural requirements for the stronger and tougher CNT/ceramic composites. Here we show that a novel processing approach based on the precursor method for synthesis of Al₂O₃ and acid-treated multi-walled carbon nanotubes (MWCNTs) can diminish the phase segregation, and render MWCNT/Al₂O₃ composites highly homogeneous. Combined with mechanical interlock induced by the chemically modified MWCNTs, this approach leads to improved mechanical properties. Direct toughness measurements, using the single edge notched beam method, reveal that only 0.9 vol.% acid-treated MWCNT addition results in 25% increases in fracture toughness (5.90±0.27 MPa·m^1/2).
Evaluation of CO2 sorption capacity of rocks using a gravimetric method for CO2 geological sequestration Peer-reviewed

Takashi Fujii, Yoshiyuki Sato, Hongfei Lin, Hiroshi Inomata, Toshiyuki Hashida

GREENHOUSE GAS CONTROL TECHNOLOGIES 9　1　(1)　3723-3730　2009

DOI： 10.1016/j.egypro.2009.02.171 　

ISSN： 1876-6102
Measurements of CO2 sorption on rocks using a volumetric technique for CO2 geological storage Peer-reviewed

Takashi Fujii, Yuichi Sugai, Kyuro Sasaki, Toshiyuki Hashida

GREENHOUSE GAS CONTROL TECHNOLOGIES 9　1　(1)　3715-3722　2009

DOI： 10.1016/j.egypro.2009.02.170 　

ISSN： 1876-6102
THE EFFECTS OF OXYGEN VACANCY CONCENTRATION ON THE MECHANICAL PROPERTIES OF ZIRCONIA AND CERIA-BASED ELECTROLYTES FOR SOFCS Peer-reviewed

Toshiyuki Hashida, Yohei Takeyama, Kazuhisa Sato

PROCEEDINGS OF THE 7TH INTERNATIONAL CONFERENCE ON FUEL CELL SCIENCE, ENGINEERING, AND TECHNOLOGY　773-777　2009

DOI： 10.1115/FuelCell2009-85241 　
Development of fractional derivative–based mass transport model for evaluation of complex crustal fluid flow Peer-reviewed

Anna Suzuki, Ryoichi Chiba, Takashi Okaze, Toshiyuki Hashida

Proceedings of the 6th International Conference on Flow Dynamics, November 4-6, 2009, Sendai, Japan　in CD ROM　2009
Classification of Mechanical Failure in SOFC and Strategy for Evaluation of Operational Margin Peer-reviewed

T. Kawada, S. Watanabe, S. Hashimoto, T. Sakamoto, A. Unemoto, M. Kurumatani, K. Sato, F. Iguchi, K. Yashiro, K. Amezawa, K. Terada, M. Kubo, H. Yugami, T. Hashida, J. Mizusak

Electrochemical Society Transactions　25　(2)　467-472　2009
A novel structure for carbon nanotube reinforced alumina composites with improved mechanical properties Peer-reviewed

G. Yamamoto, M. Omori, T. Hashida, H. Kimura

NANOTECHNOLOGY　19　(31)　315708-315714　2008/08

DOI： 10.1088/0957-4484/19/31/315708 　

ISSN： 0957-4484
Influence of additions of coal fly ash and quartz on hydrothermal solidification of blast furnace slag Peer-reviewed

Z. Jing, F. Jin, T. Hashida, N. Yamasaki, Emile H. Ishida

CEMENT AND CONCRETE RESEARCH　38　(7)　976-982　2008/07

DOI： 10.1016/j.cemconres.2008.01.017 　

ISSN： 0008-8846
Mechanical properties and structural characterization of carbon nanotube/alumina composites prepared by precursor method Peer-reviewed

Go Yamamoto, Mamoru Omori, Kenji Yokomizo, Toshiyuki Hashida

DIAMOND AND RELATED MATERIALS　17　(7-10)　1554-1557　2008/07

DOI： 10.1016/j.diamond.2008.01.059 　

ISSN： 0925-9635
Tribological properties of single-walled carbon nanotube solids Peer-reviewed

Go Yamamoto, Toshiyuki Hashida, Koshi Adachi, Toshiyuki Takagj

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY　8　(5)　2665-2670　2008/05

DOI： 10.1166/jnn.2008.295 　

ISSN： 1533-4880
The electrical properties of polymer nanocomposites with carbon nanotube fillers Peer-reviewed

Ning Hu, Zen Masuda, Cheng Yan, Go Yamamoto, Hisao Fukunaga, Toshiyuki Hashida

NANOTECHNOLOGY　19　(21)　215701-215710　2008/05

DOI： 10.1088/0957-4484/19/21/215701 　

ISSN： 0957-4484

eISSN： 1361-6528
The Electrical Properties of Polymer Nanocomposites with Carbon Nanotube Fillers Peer-reviewed

N. Hu, Z. Masuda, C. Yan, G. Yamamoto, H. Fukunaga, T. Hashida

Nanotechnology　19　(215701)　1-10　2008/04
Experimental evaluation of interactions in supercritical CO(2)/water/rock minerals system under geologic CO(2) sequestration conditions Peer-reviewed

Hongfei Lin, Takashi Fujii, Reisuke Takisawa, Toru Takahashi, Toshiyuki Hashida

JOURNAL OF MATERIALS SCIENCE　43　(7)　2307-2315　2008/04

DOI： 10.1007/s10853-007-2029-4 　

ISSN： 0022-2461
Influence of tobermorite formation on mechanical properties of hydrothermally solidified blast furnace slag Peer-reviewed

Zhenzi Jing, F. Jin, T. Hashida, N. Yamasaki, Emile H. Ishida

JOURNAL OF MATERIALS SCIENCE　43　(7)　2356-2361　2008/04

DOI： 10.1007/s10853-007-2025-8 　

ISSN： 0022-2461
Effects of titanium surface modifications on bonding behavior of hydroxyapatite ceramics and titanium by hydrothermal hot-pressing Peer-reviewed

Takamasa Onoki, Kazuyuki Hosoi, Toshiyuki Hashida, Yasuhiro Tanabe, Tornoaki Watanabe, Eiichi Yasuda, Masahiro Yoshimura

MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS　28　(2)　207-212　2008/03

DOI： 10.1016/j.msec.2006.12.002 　

ISSN： 0928-4931
Novel selective dyeing method for chrysotile asbestos detection in concrete materials Peer-reviewed

Yoshihiko Oke, Nakamichi Yamasaki, Go Yamamoto, Kazuhiro Sasaki, Naomi Maeta, Hirokazu Fujimaki, Toshiyuki Hashida

ENVIRONMENTAL SCIENCE & TECHNOLOGY　42　(5)　1638-1642　2008/03

DOI： 10.1021/es071805a 　

ISSN： 0013-936X
Super-robust, lightweight, conducting carbon nanotube blocks cross-linked by de-fluorination Peer-reviewed

Yoshinori Sato, Makoto Ootsubo, Go Yamamoto, Gregory Van Lier, Mauricio Terrones, Shinji Hashiguchi, Hisamichi Kimura, Akira Okubo, Kenichi Motomiya, Balachandran Jeyadevan, Toshiyuki Hashida, Kazuyuki Tohji

ACS NANO　2　(2)　348-356　2008/02

DOI： 10.1021/nn700324z 　

ISSN： 1936-0851
Preparation of SDC electrolyte thin films on dense and porous substrates by modified sol-grel route Peer-reviewed

Hongfei Lin, Changsheng Ding, Kazuhisa Sato, Yoshifumi Tsutai, Hiromichi Ohtaki, Mabito Iguchi, Chiharu Wada, Toshiyuki Hashida

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS　148　(1-3)　73-76　2008/02

DOI： 10.1016/j.mseb.2007.09.039 　

ISSN： 0921-5107
Structural characterization and frictional properties of carbon nanotube/alumina composites prepared by precursor method Peer-reviewed

Go Yamamoto, Mamoru Omori, Kenji Yokomizo, Toshiyuki Hashida, Koshi Adachi

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS　148　(1-3)　265-269　2008/02

DOI： 10.1016/j.mseb.2007.09.013 　

ISSN： 0921-5107
2608 Evaluation of CO_2 sorption behavior of rocks using volumetric method for CO_2 geological sequestration

FUJII Takashi, SUGAI Yuichi, SASAKI Kyuro, HASHIDA Toshiyuki

The proceedings of the JSME annual meeting　2008　175-176　2008
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2008.3.0_175 　

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It is an important step to understand the capacity of host reservoir rocks for CO_2 storage in order to assess the potential of CO_2 geological sequestration. In this study, CO_2 sorption capacity of rocks (granite and sandstone) under air dry and water saturated conditions was evaluated experimentally at temperatures of 33, 40 and 50℃, and pressures up to 20 MPa using a volumetric method. As a result, sorption isotherms for CO_2 showed that the CO_2 sorption capacity of both the rocks increased with the increasing CO_2 pressure, and decreased with the increasing temperature under both the air dry and water saturated conditions. The amount of CO_2 sorption are significantly larger than theoretical value based on a solubility model, which assumes that CO_2 injected within water-filled reservoir will dissolve into pore water. These CO_2 sorption capacities could not fully be explained by CO_2 dissolution in water alone. Furthermore, it has been shown very interestingly that the amount of CO_2 sorption measured for the air dry condition was close to that obtained for water saturated condition. The amount of CO_2 sorption for the sandstone is approximately two times larger than that of the granite. This investigation may point out the significance of CO_2 sorption onto rock minerals for the possible mechanism in CO_2 geological sequestration.
1242 Fabrication and Evaluation of Functional Oxide Thin Film by using Powder Jet Deposition Method

SATO Kazuhisa, SONE Tatsuya, YASHIRO Keiji, OGAWA Kazuhiro, KAWADA Tatsuya, KURIYAGAWA Tsunemoto, HASHIDA Toshiyuki, MIZUSAKI Junichiro

The proceedings of the JSME annual meeting　2008　329-330　2008
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2008.6.0_329 　

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Powder Jet Deposition (PJD) method is one of the film forming technique& Ceramics films can be fabricated by this method Ytariastabilized zirconia (YSZ) thin films were deposited on various substrates by PJD method YSZ thin film was fabricated in systemically changed substrates, particle sizes and carrier gas pressures. The microstructures of YSZ films were observed by scanning electron microscope (SEM). From this study results, the amount of deposition rate by PJD method varies according to substrate hardness and powder size. Similarly, the film structures are affected by substrate and powder size. Additionally, the electrical conductivity of YSZ film on Al_2O_3 substrate was measured as a function of temperature using impedance and two-probe A.C. method From this measurement, the amount of this film's electrical conductivity is good agreement from other studies of YSZ bulks. This result shows probability of application to high temperature ceramics devices such as Solid Oxide Fuel Cells (SOFCs), gas sensors.
Preparation of carbon nanotube - Toughened alumina composites Peer-reviewed

G. Yamamoto, M. Omori, T. Hashida

WATER DYNAMICS　987　83-+　2008

ISSN： 0094-243X
Effect of Chemically-induced Expansion on Damage of Solid Oxide Fuel Cell Peer-reviewed

Kazuhisa Sato, Kenji Yashiro, Toshiyuki Hashida, Tatsuya Kawada, Hiroo Yugami, Junichiro Mizusaki

Transactions of the Japan Society of Mechanical Engineers　74　(737)　68-74　2008
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.74.68 　

ISSN： 0387-5008

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The influence of chemically-induced expansion on the fracture damage of a ceria based solid oxide fuel cell (SOFC) was investigated by using numerical stress analyses. The single cell examined in this study was composed of electrolyte [(CeO₂) _0.8 (SmO_1.5) _0.2], anode (Cermets of NiO-20 SDC), and cathode (La_0.6Sr_0.4Co_0.2Fe_0.8O₃), respectively. The finite element method was employed to calculate the residual stress, thermal stresses, and chemically-induced expansion stresses for the single cell. The residual and thermal stresses were calculated much smaller than the fracture strength of the individual components of the single cell. On the other hand, the chemically-induced expansion stresses were shown to remarkably increase for the temperature range greater than 973 K and accounted their magnitude for the primary part of the induced stress. It was shown from the stress analysis that the maximum stress induced in the single cell exceeded the fracture strength of the individual components at the onset of the fracture damage detect by acoustic emission method. The above-mentioned calculation results suggest that the chemically-induced expansion should be taken into account for the use of ceria based ceramics materials in SOFCs.
Numerical simulation of supercritical CO2 injection into subsurface rock masses Peer-reviewed

Kenta Sasaki, Takashi Fujii, Yuichi Nilbori, Takatoshi Ito, Toshiyuki Hashida

ENERGY CONVERSION AND MANAGEMENT　49　(1)　54-61　2008/01

DOI： 10.1016/j.enconman.2007.05.015 　

ISSN： 0196-8904
Synthesis of NiO-Ce0.8Sm0.2O1.9 composite nanopowders for solid oxide fuel cells Peer-reviewed

C. Ding, H. Lin, K. Sato, T. Hashida

WATER DYNAMICS　987　30-+　2008

DOI： 10.1063/1.2896972 　

ISSN： 0094-243X
Synthesis and characterization of La0.8Sr0.2Co0.8Fe0.2O3 nanoparticles for intermediate-low temperature solid oxide fuel cell cathodes Peer-reviewed

C. Ding, H. Lin, K. Sato, T. Hashida

WATER DYNAMICS　987　35-+　2008

DOI： 10.1063/1.2896973 　

ISSN： 0094-243X
Ni-GDC anode-supported ceria electrolyte film and its application in solid oxide fuel cells Peer-reviewed

H. Lin, C. Ding, K. Kumada, K. Sato, Y. Tsutai, C. Wada, T. Hashida

WATER DYNAMICS　987　54-+　2008

DOI： 10.1063/1.2896978 　

ISSN： 0094-243X
Further development of selective dyeing method for detecting chrysotile asbestos in building materials Peer-reviewed

Y. Oke, N. Yamasaki, N. Maeta, H. Fujimaki, T. Hashida

WATER DYNAMICS　987　58-+　2008

DOI： 10.1063/1.2896979 　

ISSN： 0094-243X
Possibility of shear type fracture in viscoplastic material under confining pressures Peer-reviewed

H. Yamaguchi, K. Sakaguchi, K. Sato, K. Matsuki, T. Hashida

WATER DYNAMICS　987　79-+　2008

DOI： 10.1063/1.2896985 　

ISSN： 0094-243X
Preparation of carbon nanotube - Toughened alumina composites Peer-reviewed

G. Yamamoto, M. Omori, T. Hashida

AIP Conference Proceedings　987　83-85　2008

DOI： 10.1063/1.2896986 　

ISSN： 0094-243X 1551-7616
Application of AE technique on properties evaluation of anode-supported ceria electrolyte thin film-based SOFCs Peer-reviewed

H. Lin, C. Ding, K. Kumada, K. Sato, Y. Tsutai, C. Wada, T. Hashida

WATER DYNAMICS　987　163-+　2008

DOI： 10.1063/1.2896966 　

ISSN： 0094-243X
Numerical Simulations of the Anomalous Solute Transport in a Fractured Porous Aquifer Peer-reviewed

Ryuichi Chiba, Takashi Okaze, Sergei Fomin, Vladimir Chugunov, Yuichi Niibori, Hisao Fukunaga, Toshiyuki Hashida

Geothermal Resources Council Transactions　32　441-443　2008
Mathematical Modeling of Non-Fickian Diffusion in Complex Media: From Microscale to Mesoscale and Macroscale Invited Peer-reviewed

S. Fomin, V. Chugnov, Toshiyuki Hashida

Proc. of I2th International Workshop on New Approaches to HIGH.TECH., Nano-Design, Technology, Computer Simulations (NDTCS ’08), (June 23-27, 2008, Minsk, Belarus)　199-203　2008
Synthesis of perovskite LSCF powders by citrate gel-combusion for SOFCs applications Peer-reviewed

Hongfei Lin, Changsheng Ding, Kazuhisa Sato, Yoshifumi Tsutai, Mabito Iguchi, Toshiyuki Hashida

World Journal of Engineering　5　344-345　2008
Fabrication of Yttria-Stabilized Zirconia Thin Films Under Room Temperature and Atmospheric Pressure Conditions Peer-reviewed

Tatsuya Sone, Kazuhisa Sato, Keiji Yashiro, Kazuhiro Ogawa, Tatuya Kawada, Tsunemoto Kuriyagawa, Toshiyuki Hashida, Junichiro Mizusaki

Proceedings of the 3rd JSME/ASME International Conference on Material and Processing, ICM&P 2008, in CD ROM　2008
Effect of fabrication process on electrical properties of polymer/multi-wall carbon nanotube nanocomposites Peer-reviewed

Ning Hu, Zen Masuda, Go Yamamoto, Hisao Fukunaga, Toshiyuki Hashida, Jinghao Qiu

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING　39　(5)　893-903　2008

DOI： 10.1016/j.compositesa.2008.01.002 　

ISSN： 1359-835X
MECHANICAL PROPERTIES OF CERIA BASED OXYGEN IONIC CONDUCTORS FOR SOFC Peer-reviewed

Hiroo Yugami, Fumitada Iguchi, Kazuhisa Sato, Toshiyuki Hashida

PROCEEDINGS OF THE 6TH INTERNATIONAL CONFERENCE ON FUEL CELL SCIENCE, ENGINEERING, AND TECHNOLOGY - 2008　85-91　2008

DOI： 10.1115/FuelCell2008-65206 　
Conductivity variation of yttria-stabilized zirconia under stress Peer-reviewed

T. Izumi, R. Narumi, K. Sato, K. Suzuki, K. Yashiro, T. Hashida, J. Mizusaki

ECS Transactions　16　(51)　125-132　2008

DOI： 10.1149/1.3242227 　

ISSN： 1938-5862 1938-6737
Hydrothermal solidification of blast furnace slag by formation of tobermorite Peer-reviewed

Zhenzi Jing, F. Jin, T. Hashida, N. Yamasaki, H. Ishida

JOURNAL OF MATERIALS SCIENCE　42　(19)　8236-8241　2007/10

DOI： 10.1007/s10853-007-1726-3 　

ISSN： 0022-2461
Simulation of contaminant transport in a fractured porous aquifer Peer-reviewed

Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME　129　(9)　1157-1163　2007/09

DOI： 10.1115/1.2754327 　

ISSN： 0098-2202
Preparation of hydroxyapatite ceramics by hydrothermal hot-pressing method at 300 degrees C Peer-reviewed

Junguo Li, Toshiyuki Hashida

JOURNAL OF MATERIALS SCIENCE　42　(13)　5013-5019　2007/07

DOI： 10.1007/s10853-006-061-3-7 　

ISSN： 0022-2461
Polycarbosilane-derived SiC/single-walled carbon nanotube nanocomposites Peer-reviewed

Go Yamamoto, Kenji Yokomizo, Mamoru Omori, Yoshinori Sato, Balachandran Jeyadevan, Kenichi Motomiya, Toshiyuki Hashida, Toru Takahashi, Akira Okubo, Kazuyuki Tohji

NANOTECHNOLOGY　18　(14)　2007/04

DOI： 10.1088/0957-4484/18/14/145614 　

ISSN： 0957-4484
0542 Evaluation of CO_2 sorption capacity of rocks for CO_2 geological sequestration

FUJII Takashi, SATO Yoshiyuki, LIN Hongfei, SASAKI Kenta, TAKAHASHI Toru, INOMATA Hiroshi, HASHIDA Toshiyuki

The proceedings of the JSME annual meeting　2007　113-114　2007
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2007.3.0_113 　

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Anthropogenic effects on the climate can be mitigated through various artificial measures. Amongst others CO_2 sequestration on geological reservoirs including deep saline aquifers, depleted oil/gas reservoirs, and coal seams is expected to provide a powerful means for drastically reducing emissions of CO_2 to the atmospheric. It may be an important step to understand the capacity of the host reservoir rock for CO_2 storage in order to assess the potential of CO_2 geological sequestration. In this study, CO_2 sorption capacity of rocks (granite, sandstone and natural quartz) under air dry condition was evaluated experimentally at temperatures of 50 and 100℃, and pressures up to 20MPa using a magnetic suspension balance (MSB), which allows us to measure the rock weight under the presence of supercritical CO_2. The CO_2 sorption isotherms of the rocks obtained showed that the CO_2 sorption capacity increased with the increasing pressure and decreased with the increasing temperature. Especially, the CO_2 sorption isotherms of the natural quartz were nearly the same as that of the granite. The present experimental results obtained from the weight measurements suggest that the sorption of CO_2 onto silica minerals may be the important mechanism for the CO_2 storage in reservoir rocks.
Initial behavior of granite in response to injection of CO2-saturated fluid Peer-reviewed

Yuko Suto, Lihui Liu, Nakamichi Yamasaki, Toshiyuki Hashida

APPLIED GEOCHEMISTRY　22　(1)　202-218　2007/01

DOI： 10.1016/j.apgeochem.2006.09.005 　

ISSN： 0883-2927
Effect of precipitation on cryogenic toughness in N-containing austenitic stainless steels Peer-reviewed

M. L. Saucedo-Munoz, T. Hashida, Y. Watanabe, T. Shoji, V. M. Lopez-Hirata

THERMEC 2006, PTS 1-5　539-543　4914-+　2007

ISSN： 0255-5476
Tribological Properties of Single-Walled Carbon Nanotube Solids Peer-reviewed

Go Yamamoto, Toshiyuki Hashida, Koshi Adachi, Toshiyuki Takagi

Journal of Nanoscience and Nanotechnology　8　1-6　2007

DOI： 10.1166/jnn.2008.295 　
Mechanical Properties of Single-Walled Carbon Nanotube Solids Prepared by Spark Plasma Sintering Peer-reviewed

Go Yamamoto, Yoshinori Sato, Toru Takahashi, Mamoru Omori, Kazuyuki Tohji, Toshiyuki Hashida

Journal of Solid Mechanics and Materials Engineering　1　(7)　854-863　2007
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jmmp.1.854 　

ISSN： 1880-9871

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In this paper, a spark plasma sintering (SPS) method was employed to solidify single-walled carbon nanotubes (SWCNTs) only, and the effect of processing conditions on the mechanical properties of the SWCNT solids were examined using a small punch (SP) testing method. The sintering temperatures used was in the range of 600∼1400°C, and the sintering pressures used was 40 MPa and 120 MPa. It was demonstrated that the SPS method allowed SWCNTs to be solidified, without any additives. The experimental results showed that the purification of raw soot was critically importance. The SWCNT solids prepared from purified raw soot showed significant non-linear deformation response, producing quasi-ductile fracture behavior. In contrast, raw soot produced brittle solids. The Young's modulus, fracture strength and work of fracture increased with the increasing sintering temperature and pressure. The Raman and SEM analyses showed that the amount of the graphite-like materials were observed to increase with the increasing temperature and pressure, which indicate that the structure of the SWCNTs was changed partially into the graphite-like materials. The formation of graphite-like materials increased tendency of brittle fracture in the SWCNT solids. TEM observations revealed that the fracture surfaces of the SWCNT solids were characterized by pull out of SWCNT bundles. This observation suggests that it may be possible to improve the mechanical properties of SWCNT solids by increasing the cohesion between SWCNTs.
Evaluation of tribological properties of binder-free single-walled carbon nanotube solids for solid lubrication applications Peer-reviewed

G. Yamamoto, T. Hashida, K. Adachi, Y. Sato, K. Tohji

WATER DYNAMICS　898　130-+　2007

DOI： 10.1063/1.2721263 　

ISSN： 0094-243X
Tribological and strength properties of alumina/multi-walled carbon nanotube composites Peer-reviewed

G. Yamamoto, K. Yokomizo, M. Omori, Y. Aizawa, T. Hashida

WATER DYNAMICS　898　154-+　2007

DOI： 10.1063/1.2721269 　

ISSN： 0094-243X
Estimation of the number of cross-links of multi-walled carbon nanotube films formed by a dehydration condensation reaction Peer-reviewed

S. Ogino, Y. Sato, G. Yamamoto, K. Sasamori, H. Kimura, T. Hashida, K. Motomiiya, B. Jeyadevan, K. Tohji

WATER DYNAMICS　898　175-+　2007

DOI： 10.1063/1.2721274 　

ISSN： 0094-243X
Investigation of interactions in a simulated geologic CO2/rock minerals system for CO2 underground sequestration Peer-reviewed

H. Lin, T. Fujii, R. Takisawa, T. Hashida

WATER DYNAMICS　898　17-+　2007

DOI： 10.1063/1.2721242 　

ISSN： 0094-243X
Numerical simulation of injection for CO2 geological sequestration with a treatment of CO2 dissolution into water Peer-reviewed

K. Sasaki, T. Fujii, Y. Niibori, T. Ito, T. Hashida

WATER DYNAMICS　898　45-+　2007

DOI： 10.1063/1.2721247 　

ISSN： 0094-243X
Numerical model of fluid flow through heterogeneous rock for high level radioactive waste disposal Peer-reviewed

M. Shirai, R. Chiba, S. Fomin, V. Chugunov, T. Takahashi, Y. Niibori, T. Hashida

WATER DYNAMICS　898　57-+　2007

DOI： 10.1063/1.2721249 　

ISSN： 0094-243X
Numerical simulation of non-fickian diffusion and advection in a fractured porous aquifer Peer-reviewed

R. Chiba, S. Fomin, V. Chugunov, Y. Niibori, T. Hashida

WATER DYNAMICS　898　75-+　2007

DOI： 10.1063/1.2721253 　

ISSN： 0094-243X
Evaluation of CO2 sorption capacity of granite for CO2 geological sequestration Peer-reviewed

T. Fujii, Y. Sato, H. Lin, K. Sasaki, T. Takahashi, H. Inoniatat, T. Hashida

WATER DYNAMICS　898　79-+　2007

DOI： 10.1063/1.2721254 　

ISSN： 0094-243X
Tribological Properties of Single-Walled Carbon Nanotube Solids Peer-reviewed

Go Yamamoto, Toshiyuki Hashida, Koshi Adachi, Toshiyuki Takagi

Proceedings of The Seventh International Symposium on Advanced Fluid Information and The Fourth International Symposium on Transdisciplinary Fluid Integration, (Tohoku University, Sendai, Japan, December 14-15, 2007)　122-125　2007
Modeling of Fluid Flow in Complex Fracture Systems for Sustainable Subsurface Utilization Peer-reviewed

Toshiyuki Hashida, Ryuichi Chiba, Sergei Fomin

Proc. of 1st Int. Sympo. on Aqua Science, Water Resource and Innovation Development of Countryside, (Sakawa, Kochi, Japan, November 26-30, 2007)　97-102　2007
The development of a novel immersion dyeing method for chrysotile asbestos in building materials Peer-reviewed

Yoshihiko Oke, Nakamichi Yamasaki, Go Yamamoto, Naomi Maeta, Hirokazu Fujimaki, Toshiyuki Hashida

Proc. of 1st Int. Sympo. on Aqua Science, Water Resource and Innovation Development of Countryside, (Sakawa, Kochi, Japan, November 26-30, 2007)　115-118　2007
Alteration of asbestos under acidic hydrothermal conditions Peer-reviewed

J.Nakanishi, T.Wada, K.Yokosawa, T.Kori, N.Yamasaki, T.Hashida

Proc. of 1st Int. Sympo. on Aqua Science, Water Resource and Innovation Development of Countryside, (Sakawa, Kochi, Japan, November 26-30, 2007)　255-258　2007
Synthesis of kaolinite from chrysotile Peer-reviewed

J.Nakanishi, T.Wada, K.Yokosawa, T.Kori, N.Yamasaki, T.Hashida

Proc. of 1st Int. Sympo. on Aqua Science, Water Resource and Innovation Development of Countryside, (Sakawa, Kochi, Japan, November 26-30, 2007)　259-261　2007
Autocombustion synthesis of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ(LSCF) perovskite nanosized powder via modified sol-gel route Peer-reviewed

Hongfei Lin, Changsheng Ding, Kazuhisa Sato, Yoshifumi Tsutai, Chiharu Wada, Toshiyuki Hashida

Proc. of 1st Int. Sympo. on Aqua Science, Water Resource and Innovation Development of Countryside, (Sakawa, Kochi, Japan, November 26-30, 2007)　297-302　2007
Laboratory Study of CO₂ Trapping Behavior in Supercritical CO₂ / vapor / granite System for Geological Storage of CO₂ Peer-reviewed

Hongfei LIN, Takashi FUJII, Reisuke TAKISAWA, Toshiyuki HASHIDA

Proc. of 1st Int. Sympo. on Aqua Science, Water Resource and Innovation Development of Countryside, (Sakawa, Kochi, Japan, November 26-30, 2007)　303-308　2007
Numerical Solutions of the Anomalous Contaminant Transport in a Heterogeneous Aquifer Peer-reviewed

Ryuichi Chiba, Sergei Fomin, Vladimir Chugunov, Yuichi Niibori, Toshiyuki Hashida

Proc. of 1st Int. Sympo. on Aqua Science, Water Resource and Innovation Development of Countryside, (Sakawa, Kochi, Japan, November 26-30, 2007)　349-352　2007
Hydrothermal Treatment on Titanium Metal for Improving Adhesive Properties of Hydroxyapatite Ceramics Coating Peer-reviewed

Takamasa Onoki, Atsushi Nakahira, Toshiyuki Hashida

Proc. of 1st Int. Sympo. on Aqua Science, Water Resource and Innovation Development of Countryside, (Sakawa, Kochi, Japan, November 26-30, 2007)　353-356　2007
Synthesis of Magnesite under Hydrothermal Conditions Peer-reviewed

Yasuhiro Matsumoto, Yoshihiko Oke, Nakamichi Yamasaki, Toshiyuki Hashida

Proc. of 1st Int. Sympo. on Aqua Science, Water Resource and Innovation Development of Countryside, (Sakawa, Kochi, Japan, November 26-30, 2007)　383-388　2007
Reliability Evaluation of SOFC under Simulated Operating Condition Peer-reviewed

K. Sato, N. Imanaka, K. Fukui, M. Numao, S. Kyotani, K. Yashiro, T. Kawada, T. Hashida, J. Mizusaki

SOLID OXIDE FUEL CELLS 10 (SOFC-X), PTS 1 AND 2　7　(1)　455-+　2007

DOI： 10.1149/1.2729123 　

ISSN： 1938-5862
Municipal incineration bottom ash treatment using hydrothermal solidification Peer-reviewed

Zhenzi Jing, Norihisa Matsuoka, Fangming Jin, Toshiyuki Hashida, Nakamichi Yamasaki

WASTE MANAGEMENT　27　(2)　287-293　2007

DOI： 10.1016/j.wasman.2006.01.015 　

ISSN： 0956-053X
EFFECTS OF PROCESSING TEMPERATURE ON BONDING BEHAVIOR OF HYDROXYAPATITE CERAMICS AND TITANIUM BY HYDROTHERMAL HOT-PRESSING METHOD Peer-reviewed

Takamasa Onoki, Tomoaki Watanabe, Eiichi Yasuda, Masahiro Yoshimura, Toshiyuki Hashida, Yasuhiro Tanabe

CHARACTERIZATION AND CONTROL OF INTERFACES FOR HIGH QUALITY ADVANCED MATERIALS II　198　97-+　2007

ISSN： 1042-1122
Dissolution and deposition behavior of granite and calc-silicate rock in CO2-saturated hydrothermal system Peer-reviewed

Y. Suto, N. Tsuchiya, T. Hashida

WATER-ROCK INTERACTION, VOLS 1 AND 2, PROCEEDINGS　647-651　2007
Confining pressure dependency of LEFM parameter in rock based on cohesive crack analysis Peer-reviewed

Kazushi Sato, Toshiyuki Hashida

Zairyo/Journal of the Society of Materials Science, Japan　55　(12)　1067-1072　2006/12

DOI： 10.2472/jsms.55.1067 　

ISSN： 0514-5163
Relation of the number of cross-links and mechanical properties of multi-walled carbon nanotube films formed by a dehydration condensation reaction Peer-reviewed

Shin-ichi Ogino, Yoshinori Sato, Go Yamamoto, Kenichiro Sasamori, Hisamichi Kimura, Toshiyuki Hashida, Kenichi Motomiya, Balachandran Jeyadevan, Kazuyuki Tohji

JOURNAL OF PHYSICAL CHEMISTRY B　110　(46)　23159-23163　2006/11

DOI： 10.1021/jp0642387 　

ISSN： 1520-6106
In situ formation of hydroxyapatite-whisker ceramics by hydrothermal hot-pressing method Peer-reviewed

Jun-Guo Li, Toshiyuki Hashida

JOURNAL OF THE AMERICAN CERAMIC SOCIETY　89　(11)　3544-3546　2006/11

DOI： 10.1111/j.1552-2916.2006.01149.x 　

ISSN： 0002-7820
Relation of the Number of Cross-links and Mechanical Properties of Multi-Walled Carbon Nanotube Films Formed by a Dehydration Condensation Reaction Peer-reviewed

S. Ogino, Y. Sato, G. Yamamoto, K. Sasamori, H. Kimura, T. Hashida, K. Motomiya, B. Jeyadevan, K. Tohji

Journal of Physical Chemistry B　10　(46)　23159-23163　2006/11

DOI： 10.1021/jp0642387 　
Effects of Thermal Stresses on Rock Permeability with Application to the Thermal Extraction from Supercritical Rock Masses

Chiba, R, Takashima Y, Takahashi, T, Ito, T, Hayashi, K, Hashida, T

Proc. Renewable Energy 2006 – Advanced Technology Paths to Global Sustainability –　1575-1577　2006/10/09
Influence of quartz particle size on hydrothermal solidification of blast furnace slag Peer-reviewed

Zhenzi Jing, Emile Hideki Ishida, Fangming Jin, Toshiyuki Hashida, Nakamichi Yamasaki

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH　45　(22)　7470-7474　2006/10

DOI： 10.1021/ie060461e 　

ISSN： 0888-5885
New method for hydroxyapatite coating of titanium by the hydrothermal hot isostatic pressing technique Peer-reviewed

Takamasa Onoki, Toshiyuki Hashida

SURFACE & COATINGS TECHNOLOGY　200　(24)　6801-6807　2006/08

DOI： 10.1016/j.surfcoat.2005.10.016 　

ISSN： 0257-8972
Single-walled carbon nanotube-derived novel structural material Peer-reviewed

G Yamamoto, Y Sato, T Takahashi, M Omori, T Hashida, A Okubo, K Tohji

JOURNAL OF MATERIALS RESEARCH　21　(6)　1537-1542　2006/06

DOI： 10.1557/JMR.2006.0186 　

ISSN： 0884-2914
Cohesive crack analysis of toughness increase due to confining pressure Peer-reviewed

K Sato, T Hashida

PURE AND APPLIED GEOPHYSICS　163　(5-6)　1059-1072　2006/06

DOI： 10.1007/s00024-006-0060-2 　

ISSN： 0033-4553
Fracture toughness evaluation based on tension-softening model and its application to hydraulic fracturing Peer-reviewed

K Sato, T Hashida

PURE AND APPLIED GEOPHYSICS　163　(5-6)　1073-1089　2006/06

DOI： 10.1007/s00024-006-0066-6 　

ISSN： 0033-4553
Tracking the onset of damage mechanism in ceria-based solid oxide fuel cells under simulated operating conditions Peer-reviewed

K Sato, H Omura, T Hashida, K Yashiro, H Yugami, T Kawada, J Mizusaki

JOURNAL OF TESTING AND EVALUATION　34　(3)　246-250　2006/05

ISSN： 0090-3973
Numerical Simulation of Crack Propagation with Shear Slip Induced by Hydraulic Fracturing

UCHIGATA Mitsuru, ITAOKA Mikiyo, SATO Kazushi, HASHIDA Toshiyuki

Transactions of the Japan Society of Mechanical Engineers Series B　72　(716)　419-424　2006/04/25
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.72.419 　

ISSN： 0387-5008

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Geothermal energy is one of the most enviroment-conscious resources among the natural resources. In developing an enhanced geothermal energy extraction system, a hydraulic fracturing is the key technology to emerge an efficient geothermal reservoir. The formation of the geothermal reservoir induced by the hydraulic fracturing has to be predicted to design the geothermal energy extraction system. In this study, crack propagation induced by the hydraulic fracturing of an inclined crack is numerically analyzed. In the numerical model, shear slip deformation is taken into account. When the fluid pressure acts on the inclined crak, shear slip deformation is takes place prior to crack opening due to the pressure that overcomes the normal stress acting on the crack plane. Furthermore, the numerical results suggest that the crack can be propagated by a critical fluid pressure less than the minimum tectonic stress under typical tectonic stress condition, since the stress state at the crack tip is intensified by shear slip deformation. Therefore, the critical fluid pressure for the inclined crack is characterized by the effective shear stress that indicates shear slip condition of the crack.
X-ray absorption fine structure (XAFS) analyses of Ni species trapped in graphene sheet of carbon nanofibers Peer-reviewed

Y. Sato, M. Ohtsubo, B. Jeyadevan, K. Tohji, K. Motomiya, R. Hatakeyama, G. Yamamoto, M. Omori, T. Hashida, K. Tamura, T. Akasaka, M. Uo, A. Yokoyama, F. Watari

Physical Review　B　(73)　144103-1-144103-11　2006/04

DOI： 10.1103/PhysRevB.73.144103 　
Assessment of stimulated area growth during high-pressure hydraulic stimulation of fractured subsurface reservoir Peer-reviewed

S Fomin, Chugunov, V, T Hashida

TRANSPORT IN POROUS MEDIA　63　(1)　99-125　2006/04

DOI： 10.1007/s11242-005-3326-5 　

ISSN： 0169-3913
Solidification of coal fly ash using hydrothermal processing method Peer-reviewed

Z Jing, N Matsuoka, F Jin, N Yamasaki, K Suzuki, T Hashida

JOURNAL OF MATERIALS SCIENCE　41　(5)　1579-1584　2006/03

DOI： 10.1007/s10853-006-4648-6 　

ISSN： 0022-2461
Hydrothermal dynamics on environmental problems using the aspect of earth science Peer-reviewed

N Yamasaki, Y Yamasaki, K Tohji, N Tsuchiya, T Hashida, K Ioku

JOURNAL OF MATERIALS SCIENCE　41　(5)　1599-1604　2006/03

DOI： 10.1007/s10853-006-4654-8 　

ISSN： 0022-2461
Evaluation of creep properties of reduced activation ferritic steels by small punch creep test Peer-reviewed

T Nakata, SI Komazaki, Y Kohno, K Shiba, A Kohyama, T Hashida

JOURNAL OF THE JAPAN INSTITUTE OF METALS　70　(2)　130-133　2006/02

DOI： 10.2320/jinstmet.70.130 　

ISSN： 0021-4876

eISSN： 1880-6880
Application of fractional derivatives for simulating diffusion into porous matrix in mathematical modeling of the contaminant transport in a confined fractured porous aquifer Peer-reviewed

Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida

American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED　2006
Publisher: American Society of Mechanical Engineers (ASME)
DOI： 10.1115/IMECE2006-16138 　

ISSN： 0888-8116
Mechanical properties of binder-free single-walled carbon nanotube solids Peer-reviewed

G Yamamoto, Y Sato, T Takahashi, M Omori, A Okubo, K Tohji, T Hashida

SCRIPTA MATERIALIA　54　(2)　299-303　2006/01

DOI： 10.1016/j.scriptamat.2005.03.053 　

ISSN： 1359-6462
Low temperature synthesis of hydroxyapatite from CaHPO4 center dot 2H(2)O and Ca(OH)(2) based on effect of the spark plasma system (SPS) Peer-reviewed

Mamoru Omori, Takamasa Onoki, Toshiyuki Hashida, Akira Okubo, Yoshihiro Murakami

CERAMICS INTERNATIONAL　32　(6)　617-621　2006

DOI： 10.1016/j.ceramint.2005.04.021 　

ISSN： 0272-8842
Route to the synthesis of binder-free SWCNT solids with enhanced mechanical properties Peer-reviewed

G. Yamamoto, Y. Sato, M. Omori, K. Yokomizo, T. Hashida, T. Takahashi, A. Okubo, S. Watanabe, K. Tohji

FLOW DYNAMICS　832　425-+　2006

DOI： 10.1063/1.2204535 　

ISSN： 0094-243X
Mechanical properties of carbon nanotubes/hydroxyapatite composites prepared by spark plasma sintering Peer-reviewed

Masa-aki Tanaka, Takamasa Onoki, Mamoru Omori, Akira Okubo, Toshiyuki Hashida

FLOW DYNAMICS　832　430-+　2006

DOI： 10.1063/1.2204536 　

ISSN： 0094-243X
Numerical simulation of flow dynamics for CO2 injection into rock masses Peer-reviewed

Kenta Sasaki, Takashi Fujii, Toshiyuki Hashida

FLOW DYNAMICS　832　433-+　2006

DOI： 10.1063/1.2204537 　

ISSN： 0094-243X
Effects of NaOH concentration on CO2 reduction via hydrothermal water Peer-reviewed

Takamasa Onoki, Hiro Takahashi, Toshinari Kori, Nakamichi Yamasaki, Toshiyuki Hashida

WATER DYNAMICS　833　61-+　2006

DOI： 10.1063/1.2207074 　

ISSN： 0094-243X
Effects of pressure and reaction time on bonding of hydroxyapatite ceramics and titanium by hydrothermal hot-pressing Peer-reviewed

Masa-aki Tanaka, Takamasa Onoki, Kazuyuki Hosoi, Toshiyuki Hashida

WATER DYNAMICS　833　82-+　2006

DOI： 10.1063/1.2207080 　

ISSN： 0094-243X
Synthesis and characterization of single-walled carbon nanotube/silicon carbide composites Peer-reviewed

G. Yamamoto, K. Yokomizo, M. Omori, Y. Sato, T. Takahashi, T. Hashida, K. Motomiya, A. Okubo, S. Watanabe, K. Tohji

WATER DYNAMICS　833　94-+　2006

DOI： 10.1063/1.2207083 　

ISSN： 0094-243X
Effects of water location in starting materials on bonding behavior of hydroxyapatite and titanium via hydrothermal hot-pressing Peer-reviewed

Takamasa Onoki, Kazuyuki Hosoi, Toshiyuki Hashida

WATER DYNAMICS　833　112-+　2006

DOI： 10.1063/1.2207087 　

ISSN： 0094-243X
Numerical simulation for non-Fickian diffusion into fractured porous rock Peer-reviewed

Ryuichi Chiba, Sergei Fomin, Vladimir Chugunov, Toru Takahashi, Yuichi Niibori, Toshiyuki Hashida

WATER DYNAMICS　833　133-+　2006

DOI： 10.1063/1.2207091 　

ISSN： 0094-243X
Novel method for hydroxyapatite coating by hydrothermal hot-pressing via double layered capsule Peer-reviewed

T Onoki, T Hashida

BIOCERAMICS 18, PTS 1 AND 2　309-311　647-650　2006

ISSN： 1013-9826
Characterization of Damage and Fracture Process of Solid oxide Fuel Cells Under Simulated Operating Conditions by Using AE Method Peer-reviewed

Kazuhisa Sato, Toshiyuki Hashida, Hiroo Yugami, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki

Progress in Acoustic Emission XIII, The Japanese Society for NDI　269-276　2006
Characteristics of Damage and Fracture Process of Solid Oxide Fuel Cells Under Simulated Operating Conditions By Using AE Method Peer-reviewed

Kazuhisa Sato, Toshiyuki Hashida, Hiroo Yugami, Kenji Yashiro, Tatsuya Kawada, Junichiro Mizusaki

Journal of Acoustic Emission　24　215-221　2006
Effect of Mechanical Load on the Electrical Property of Yttria-Stabilized Zirconia, Electrochemistry and Thermodynamics on Materials Processing for Sustainable Production Peer-reviewed

K. Sato, R.Narumi, K.Yashiro, T.Kawada, H.Yugami, T.Hashida, J.Mizusaki

Masko Symposium　823-827　2006
A New Method for Evaluating Degradation of Solid Oxide Fuel Cell under Operating Conditions by Combining the Electrochemical Measurement with Non-Destructive Test Peer-reviewed

Kazuhisa Sato, Shintaro Kyotani, Toshiyuki Hashida, Hirokazu Moriya, Tatsuya Kawada, Keiji Yashiro, Takashi Nakamura, Hiroo Yugami, Junichiro Mizusaki

Proceedings of Asian Symposium on Materials and Processing 2006　2006　132-136　2006
Publisher: The Japan Society of Mechanical Engineers

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The purpose of present research is to estimate the degradation mechanism of solid oxide fuel cell (SOFC) by using combining non-destructive test and electrochemical measurement during loading test Mechanical degradation and chemically degradation were investigated by acoustic emission (AE) measurement system and electrochemical measurement,respectively. In the investigation of fracture process with AE amplitude distributions, high amplitude signal, middle amplitude signal and low amplitude signal correspond to vertical craking, delamination in the cathode, and vertical cracking in the elctrolyte respectively. It was demonstrated that the AE method enabled us to detect the above-mentioned mechanical damage and to determine the condition for the onset of the damage in the single cell.
Influences of microstructure on the mechanical behaviour in proton conductor based on BaZrO3/BaCeO3 Peer-reviewed

N. Yu, H. Yugami, K. Sato, T. Hashida

13th Solid State Proton Conductors Conference (SSPC-13)　2006
Evaluation of fracture behavior of (CeO 2) 1-x(SmO 1.5) x based solid oxide fuel cell laminates Peer-reviewed

Kazuhisa Sato, Toshiyuki Hashida, Keiji Yashiro, Hiroo Yugami, Tatsuya Kawada, Junichiro Mizusaki

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy　52　(11)　836-839　2005/11

DOI： 10.2497/jjspm.52.836 　

ISSN： 0532-8799
Evaluation of elastic property of (CeO 2) 1-x(YO 1.5)x ceramics Peer-reviewed

Kazuhisa Sato, Toshiyuki Hashida, Ken Suzuki, Hiroo Yugami, Tatsuya Kawada, Junichiro Mizusaki

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy　52　(11)　840-844　2005/11

DOI： 10.2497/jjspm.52.840 　

ISSN： 0532-8799
New processing method for hydroxyapatite coating by hydrothermal techniques Peer-reviewed

Takamasa Onoki, Masa-Aki Tanaka, Toshiyuki Hashida

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy　52　(11)　861-864　2005/11

DOI： 10.2497/jjspm.52.861 　

ISSN： 0532-8799
Preparation of single- And multi-walled carbon nanotube solids and their mechanical properties Peer-reviewed

Go Yamamoto, Yoshinori Sato, Makoto Ohtsubo, Toru Takahashi, Mamoru Omori, Akira Okubo, Kazuyuki Tohji, Toshiyuki Hashida

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy　52　(11)　831-835　2005/11

DOI： 10.2497/jjspm.52.831 　

ISSN： 0532-8799
Evaluation of mechanical properties of single-walled carbon nanotube solids prepared by spark plasma sintering Peer-reviewed

Go Yamamoto, Yoshinori Sato, Toru Takahashi, Mamoru Omori, Akira Okubo, Kazuyu Tohji, Toshiyuki Hashida

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy　52　(11)　826-830　2005/11

DOI： 10.2497/jjspm.52.826 　

ISSN： 0532-8799
Effects of polycarbosilane addition on the mechanical properties of single-walled carbon nanotube solids Peer-reviewed

G Yamamoto, M Omori, Y Sato, T Takahashi, K Tohji, T Hashida

JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING　48　(4)　189-193　2005/10

ISSN： 1344-7912
Effects of polycarbosilane addition on the mechanical properties of single-walled carbon nanotube solids Peer-reviewed

G Yamamoto, M Omori, Y Sato, T Takahashi, K Tohji, T Hashida

JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING　48　(4)　189-193　2005/10

DOI： 10.1299/jsmea.48.189 　

ISSN： 1344-7912
Preparation of single-walled carbon nanotube solids and their mechanical properties Peer-reviewed

G Yamamoto, Y Sato, T Takahashi, M Omori, T Hashida, A Okubo, S Watanabe, K Tohji

JOURNAL OF MATERIALS RESEARCH　20　(10)　2609-2612　2005/10

DOI： 10.1557/JMR.2005.0345 　

ISSN： 0884-2914
Fracture properties of (CeO2)(1-x)(RO1.5)(x) (R=Y, Gd, and Sm; x=0.02-0.20) ceramics Peer-reviewed

T Ishida, F Iguchi, K Sato, T Hashida, H Yugami

SOLID STATE IONICS　176　(31-34)　2417-2421　2005/10

DOI： 10.1016/j.ssi.2005.06.031 　

ISSN： 0167-2738

eISSN： 1872-7689
The effect of non-Fickian diffusion into surrounding rocks on contaminant transport in a fractured porous aquifer Peer-reviewed

S Fomin, Chugunov, V, T Hashida

PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES　461　(2061)　2923-2939　2005/09

DOI： 10.1098/rspa.2005.1487 　

ISSN： 1364-5021
Mechanical damage evaluation of solid oxide fuel cells under simulated operating conditions Peer-reviewed

K Sato, T Hashida, K Yashiro, H Yugami, T Kawada, J Mizusaki

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN　113　(1320)　562-564　2005/08

DOI： 10.2109/jcersj.113.562 　

ISSN： 1882-0743

eISSN： 1348-6535
Development of high-sensitivity ultrasonic transducer in air with nanofoam material Peer-reviewed

H Nagahara, T Hashida, M Suzuki, M Hashimoto

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　44　(6B)　4485-4489　2005/06

DOI： 10.1143/JJAP.44.44851 　

ISSN： 0021-4922
Fabrication of porous hydroxyapatite using hydrothermal hot pressing and post-sintering Peer-reviewed

A Nakahira, T Murakami, T Onoki, T Hashida, K Hosoi

JOURNAL OF THE AMERICAN CERAMIC SOCIETY　88　(5)　1334-1336　2005/05

DOI： 10.1111/j.1551-2916.2005.00238.x 　

ISSN： 0002-7820
New technique for bonding hydroxyapatite ceramics and titanium by the hydrothermal hot-pressing method Peer-reviewed

T Onoki, K Hosoi, T Hashida

SCRIPTA MATERIALIA　52　(8)　767-770　2005/04

DOI： 10.1016/j.scriptamat.2004.12.011 　

ISSN： 1359-6462
Preparation and Biocompatibility of Sintered Carbon Nanotube Disk Invited

M. Ohtsubo, Y. Sato, B. Jeyadevan, K. Tohji, R. Hatakeyama, G. Yamamoto, M. Ohmori, T. Hashida, K. Tamura, T. Akasaka, M. Uo, A. Yokoyama, F. Watari

Fullerenes and Nanotubes –Materials for the New Chemical Frontier-Fullerenes (The Electrochemical Society, Inc.)　PV2004-12　243-248　2005/03/01
Fracture Behavior of Ceria-based Solid Oxide Fuel Cells under Simulated Reducing Atmosphere Peer-reviewed

Kazuhisa Sato, Keiji Yashiro, Hajime Omura, Toshiyuki Hashida, Junichiro Mizusaki

Proceedings of the 16th Symposium on Functionally Graded Materials (FGM2004)　144-149　2005/03
Fracture Properties of Ceria-based Ceramics at High Temperature Peer-reviewed

Kazuhisa Sato, Ken Suzuki, Toshiyuki Hashida, Junichiro Mizusaki

Proceedings of the 16th Symposium on Functionally Graded Materials (FGM2004)　139-143　2005/03
Preparation of Hydroxyapatite Ceramics Coatind on Titanium Rod by Hydrothermal Hot-pressing Peer-reviewed

Takamasa Onoki, Masa-aki Tanaka, Kazuyuki Hosoi, Toshiyuki Hashida

Proceedings of the 16th Symposium on Functionally Graded Materials (FGM2004)　97-102　2005/03
Preparation and Mechanical Evaluation of Carbon Nanotube Solids Peer-reviewed

Go Yamamoto, Makoto Otsubo, Yoshinori Sato, Toru Takahashi, Mamoru Omori, Kazuyuki Tohji, Toshiyuki Hashida

Proceedings of the 16th Symposium on Functionally Graded Materials (FGM2004)　25-30　2005/03
Mechanical Evaluation of Single-Walled Carbon Nanotube Solids by Three Point Bending Tests Peer-reviewed

Go Yamamoto, Yoshinori Sato, Toru Takahashi, Mamoru Omori, Kazuyuki Tohji, Toshiyuki Hashida

Proceedings of the 16th Symposium on Functionally Graded Materials (FGM2004)　31-36　2005/03
Advances in mathematical modeling of hydraulic stimulation of a subterranean fractured reservoir Peer-reviewed

S Fomin, T Hashida

EIGHTH INTERNATIONAL WORKSHOP ON NONDESTRUCTIVE TESTING AND COMPUTER SIMULATIONS IN SCIENCE AND ENGINEERING　5831　148-154　2005

DOI： 10.1117/12.619674 　

ISSN： 0277-786X
A borehole temperature during drilling in a fractured rock formation Peer-reviewed

S Fomin, T Hashida, Chugunov, V, AV Kuznestov

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER　48　(2)　385-394　2005/01

DOI： 10.1016/j.ijheatmasstransfer.2004.07.042 　

ISSN： 0017-9310
Mechanical Properties of Single-Walled Carbon Nanotube Solids Prepared by Spark Plasma Sintering Peer-reviewed

Go Yamamoto, Yoshinori Sato, Toru Takahashi, Mamoru Omori, Kazuyuki Tohji, Toshiyuki Hashida

Transactions of the Japan Society of Mechanical Engineers　71　(702)　330-337　2005
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.71.330 　

ISSN： 0387-5008

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In this paper, a spark plasma sintering (SPS) method was employed to solidify single-walled carbon nanotubes (SWCNTs) only, and the effect of sintering conditions on the mechenical properties of the SWCNT solids were examined using a small punch (SP) testing method. The sintering temperature used in the range of 600-1 400°C, and the sintering pressure used 40 MPa and 120 MPa. It was demonstrated that the SPS method allowed SWCNTs to be solidified, without any additives. The experimental results showed that the purification of raw soot was critically importance. The SWCNT solid prepared from purified raw soot showed significant non-linear deformation response, producing quasi-ductile fracture behavior. In contrast, unpurified raw soot produced brittle SWCNT solids. The Young's modulus, fracture strength and work of fracture increased with increasing sintering temperature and pressure. The Raman scattering and SEM observations showed that the amount of the graphite-like materials were observed to increase with the increasing temperature and pressure, which indicate that the structure of the SWCNTs was changed partially into the graphite-like materials. The formation of graphite-like materials increased tendency of brittle fracture in the SWCNT solids. TEM observations revealed that the fracture surfaces of SWCNT solids were characterized by pull out of SWCNT bundles. This observation suggests that it may be possible to improve the mechanical properties of SWCNT solids by increasing the cohesion between SWCNTs.
Preparation of Single-Walled Carbon Nanotube Solids and Their Mechanical Properties Peer-reviewed

G. Yamamoto, Y. Sato, T. Takahashi, M. Omori, T. Hashida, A. Okubo, S. Watanabe, K. Tohji

Extended Abstracts of International Symposium on ScoTopia Science 2005 (ISETS05), (Nagoya University, Japan, August 8-9, 2005)　265-268　2005
Toughening of Hydroxyapatite by Multi-Walled Carbon Nantube Peer-reviewed

M. Omori, T. Watanabe, M. Tanaka, A. Okubo, H. Kimura, T. Hashida

Extended Abstracts of International Symposium on ScoTopia Science 2005 (ISETS05), (Nagoya University, Japan, August 8-9, 2005)　269-270　2005
Preparation of multi-walled carbon nanotube compact by the Spark Plasma System (SPS) Peer-reviewed

Mamoru Omori, Akira Okubo, Toshiyuki Hashida, Kazuyuki Tohji

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy　52　(2)　115-119　2005
Publisher: Journal of the Japan Society of Powder and Powder Metallurgy
DOI： 10.2497/jjspm.52.115 　

ISSN： 0532-8799
Preparation of Hydroxyapatite at Low Temperatures by Spark Plasma Sintering (SPS) Peer-reviewed

Mamoru Omori, Akira Okubo, Yoshihiro Murakami, Takamasa Onoki, Toshiyuki Hashida

Archives of BioCeramics Research　5　134-137　2005
Evaluation on small punch creep test by finite element method Peer-reviewed

PC Zhai, G Chen, T Hashida, QJ Zhang

ADVANCES IN FRACTURE AND STRENGTH, PTS 1- 4　297-300　377-383　2005

ISSN： 1013-9826
ＭＥＣＨＡＮＩＣＡＬ PROPERTIES AND MICROSTRUCTURAL INVASTIGATION OF SINGLE-WALLED CARBON NANOTUBE SOLIDS Peer-reviewed

G. Yamamoto, Y. Sato, T. Takahashi, M. Omori, K. Tohji, T. Hashida

2nd Int. Workshop on Water Dynamics　261-265　2004/11
Effect of rare-earth oxides on fracture properties of ceria ceramics Peer-reviewed

K Sato, H Yugami, T Hashida

JOURNAL OF MATERIALS SCIENCE　39　(18)　5765-5770　2004/09

DOI： 10.1023/B:JMSC.0000040087.37727.cd 　

ISSN： 0022-2461
Numerical analysis for small punch creep tests by finite-element method Peer-reviewed

PC Zhai, T Hashida, S Komazaki, QJ Zhang

JOURNAL OF TESTING AND EVALUATION　32　(4)　298-303　2004/07

ISSN： 0090-3973
Effects of Pressure and Reaction Time on the Bonding of Hydroxyapatite Ceramics and Tatanium by Hydrothermal Hot-pressing Method Peer-reviewed

Takamasa Onoki, Masa-aki Tanaka, Kazuyuki Hosoi, Toshiyuki Hashida

Proceedings of the 15th Symposium on Functionally Graded Materials　1-7　2004/07
Consolidation of Multi-Wallled Carbon Nanotube and Hydroxyapatite Coating Peer-reviewed

Mamoru Omori, Akira Okubo, Makoto Otsubo, Kazuyuki Tohji, Toshiyuki Hashida

Proceedings of the 15th Symposium on Functionally Graded Materials　10-15　2004/07
Effect of Impurities on Mechanical Properties of SWNTs Compact Prepared by Spark Plasma Sintering Method Peer-reviewed

Go Yamamoto, Makoto Otsubo, Yoshinori Sato, Toru Takahashi, Mamoru Omori, Kazuyuki Tohji, Toshiyuki Hashida

Proceedings of the 15th Symposium on Functionally Graded Materials　157-162　2004/07
Effect of Perlite Addition on Fracture Properties of Discontinuous Fiber-reinforced Cementitious Composites Manufactured by Extrusion Molding Peer-reviewed

Hiroyuki Takashima, Hideaki Nishimatsu, Kiyotaka Miyagai, Toshiyuki Hashida

Proceedings of the Fifth International Conference on Fracture Mechanics of Concrete and Concrete Structures, Edited by V.C. Li et al.　1029-1036　2004/04
Mechanical Properties of Single-Walled Ccarbon Nanotube Solid Prepared by Spark Plasma Sintering Method

G. Yamamoto, Y. Sato, T. Takahashi, M. Omori, K. Tohji, T. Hashida

1st International Workshop on WATER DYNAMICS　1　33-36　2004/03/17
Rimming flow of non-Newtonian fluids Peer-reviewed

Sergei Fomin, Toshiyuki Hashida

American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED　260　871-874　2004

DOI： 10.1115/IMECE2004-61443 　

ISSN： 0888-8116
Consolidation of multi-walled carbon nanotube and hydroxyapatite coating by the spark plasma system (SPS) Peer-reviewed

M Omori, A Okubo, M Otsubo, T Hashida, K Tohji

BIOCERAMICS 16　254-2　395-398　2004

ISSN： 1013-9826
Evaluation of the Effect of Rare-earth Oxides on Fracture Properties of Ceria Ceramics by Small Specimen Method Peer-reviewed

Kazuhisa Sato, Hiroo Yugami, Toshiyuki Hashida

Transactions of the Japan Society of Mechanical Engineers　70　(690)　321-326　2004
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.70.321 　

ISSN： 0387-5008

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The influences of the sintering additive content of rare-earth oxide (Y₂O₃, Gd₂O₃, Sm₂O₃) on microstructure and mechanical properties of ceria ceramics were investigated by scanning electron microscopy and small specimen technique. A small punch testing method was employed to detemine the elastic modulus and biaxial fracture stress of the ceria-based ceramics, and the fracture toughness was estimated by vickers indentation method. Rare-earth oxides doped ceria powders with a composition of (CeO₂) _1-x (RO_1.5) _x (R=Y, Gd, Sm and x=0, 0.10, 0.15, 0.20, 0.30, 0.40, 1.00) were prepared by a coprecipitation method. The powders were compacted by die pressing (50 MPa) followed by cold isostatic pressing (120 MPa), and sintered at 1 500°C in air for 5h. Grain growth in the rare-earth oxides doped ceria ceramics were significantly suppressed, compared to the pure ceria ceramics. However, the elastic modulus, fracture stress and fracture toughness were decreased significantly with increasing additive content of the rare-earth oxides, possibly due to the oxygen vacancies induced by the rare-earth oxides doping. The experimental results suggest that the change in the mechanical properties should be taken into account in the use of ceria-based ceramics for solid oxide fuel cells, in addition to the improvement of oxygen ion conductivity.
Fracture simulation of randomly cracked material with various crack length distributions Peer-reviewed

K Sato, T Hashida

ADVANCES IN FRACTURE AND FAILURE PREVENTION, PTS 1 AND 2　261-263　1055-1060　2004

ISSN： 1013-9826
Influence of Thermal Aging on Cryogenic Fracture Toughness of JN1 Steel for Superconducting Magnet Structures of Fusion Reactors Peer-reviewed

Shin-ichi Komazaki, Shi Cheng Liu, Il-Hyun Kwon, Toshiyuki Hashida, Hideaki Takahashi, Hideo Nakajima

Transactions of the Japan Society of Mechanical Engineers　70　(690)　273-280　2004
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.70.273 　

ISSN： 0387-5008

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Elastic-plastic fracture toughness tests were conducted at 77K and 4K to examine an influence of thermal aging on fracture properties of an austenitic stainless steel JN 1 at cryogenic temperature, which is a candidate material for superconducting magnet structures of fusion reactors. The tests were applied to solution-treated material and materials aged at 923-1073 K for 5 h. The experimental results showed that the fracture toughness J_IC measured on the thermally aged materials were smaller than that on the solution-treated material and decreased with increasing aging temperature. This decrease in fracture toughness due to thermal aging was caused by precipitation and coarsening of grain boundary M₂₃C₆ carbides. Additionally, small punch (SP) tests were conducted at cryogenic temperatures to investigate the relationship between the obtained J_IC and SP properties. It was found that the equivalent fracture strain ε_qf in SP specimens was linearly correlated with J_IC irrespective of testing temperature. This correlation suggests that the SP testing technique provides a useful tool for evaluating J_IC at cryogenic temperature.
Evaluation of Thermal Aging Embrittlement of Austenitic Stainless Steels JN 1, JJ 1 and JK 2 by Cryogenic Small Punch Tests Peer-reviewed

Shi Cheng Liu, Shin-Ichi Komazaki, Il-Hyun Kwon, Toshiyuki Hashida, Hideaki Takahashi, Hideo Nakajima

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A　70　(692)　628-635　2004

DOI： 10.1299/kikaia.70.628 　

ISSN： 0387-5008
Advances in Mathematical Modeling of Hydraulic Stimulation of a Subterranean Fractured Reservoir Peer-reviewed

Sergei Fomin, Toshiyuki Hashida

Proceedings of the St. Petersburg Academy of Sciences on Strength Problems (SPAS)　8　8-11　2004
Three regimes of a steady-state rimming flow of the liquid polymers Peer-reviewed

S Fomin, T Hashida

SLOW DYNAMICS IN COMPLEX SYSTEMS　708　275-276　2004

ISSN： 0094-243X
Dynamics in a complex-fracture-subterranean-system with application to HDR geothermal reservoirs Peer-reviewed

K Yoshida, S Fomin, ZZ Jing, T Hashida

SLOW DYNAMICS IN COMPLEX SYSTEMS　708　460-461　2004

ISSN： 0094-243X
Shear fracture and slip weakening behavior on granite under high pressure and high temperature water conditions Peer-reviewed

Toru Takahashi, Toshiyuki Hashida

Zairyo/Journal of the Society of Materials Science, Japan　53　(8)　889-893　2004
Publisher: Society of Materials Science Japan
DOI： 10.2472/jsms.53.889 　

ISSN： 0514-5163
Evaluation of mode I crack growth in rock Peer-reviewed

Kazushi Sato, Toshiyuki Hashida

Zairyo/Journal of the Society of Materials Science, Japan　53　(8)　894-899　2004
Publisher: Society of Materials Science Japan
DOI： 10.2472/jsms.53.894 　

ISSN： 0514-5163
Mechanical and Electrical Properties of Rare-earth Doped Ceria Ceramics for SOFC Electrolyte Peer-reviewed

Kazuhisa Sato, Hiroo Yugami, Toshiyuki Hashida

Transactions of the Materials Research Society of Japan　29　(4)　1471-1474　2004
Novel Techniques of Hydroxyapatite Coating on Titanium Utilizing Hydrothermal Hot-pressing Peer-reviewed

Takamasa Onoki, Kazuyuki Hosoi, Toshiyuki Hashida

Transactions of the Materials Research Society of Japan　29　(6)　2675-2678　2004
GD-OES Analysis of the Interface Between Titanium and Hydroxyapatite Ceramics Produced by Hydrothermal Hot-pressing Method Peer-reviewed

Takamasa Onoki, Kazuyuki Hosoi, Toshiyuki Hashida

Transactions of the Materials Research Society of Japan　29　(6)　2929-2932　2004
Hydrothermal Solidification of Municipal Incineration Bottom Ash Peer-reviewed

Zhenzi Jing, Norihisa Matsuoka, Fangming Jin, Koichi Suzuki, Toshiyuki Hashida, Nakamichi Yamasaki

Water, Steam, and Aqueous Solutions for Electric Power, Advances in Science and Technology, Proceedings of the 14th International Conference on the Properties of Water and System, (Kyoto International Conference Hall, Kyoto, Japan, August 29-September 3,　335-340　2004
Simulation of Transport Phenomena in Fractured RocksWith Application to Hot-Dry-Rock Geothermal Systems Peer-reviewed

Sergei Fomin, Zhenzi Jing, Toshiyuki Hashida

Water, Steam, and Aqueous Solutions for Electric Power, Advances in Science and Technology, Proceedings of the 14th International Conference on the Properties of Water and System, (Kyoto International Conference Hall, Kyoto, Japan, August 29-September 3,　707-712　2004
Flow Analysis for Laboratory Permeability Testing of Rocks Under Supercritical Water Conditions Peer-reviewed

Sergei Fomin, Shin-ichi Takizawa, Toshiyuki Hashida

Water, Steam, and Aqueous Solutions for Electric Power, Advances in Science and Technology, Proceedings of the 14th International Conference on the Properties of Water and System, (Kyoto International Conference Hall, Kyoto, Japan, August 29-September 3,　713-717　2004
The effect of thermal, chemical, hydrological, and mechanical factors on water/rock interaction in hdr geothermal systems Peer-reviewed

S. Fomin, Z. Jing, T. Hashida

Elsevier Geo-Engineering Book Series　2　(C)　649-654　2004

DOI： 10.1016/S1571-9960(04)80113-7 　

ISSN： 1571-9960
Supercritical water/rock interactions and generation of artificial geothermal reservoirs in deep-seated high temperature rock masses Peer-reviewed

Toshiyuki Hashida, Toru Takahashi

Elsevier Geo-Engineering Book Series　2　(C)　661-666　2004

DOI： 10.1016/S1571-9960(04)80115-0 　

ISSN： 1571-9960
Microcrack formation and fracture characteristics in granite under supercritical water conditions Peer-reviewed

Toru Takahashj, Toshiyuki Hashida

Elsevier Geo-Engineering Book Series　2　(C)　685-690　2004

DOI： 10.1016/S1571-9960(04)80119-8 　

ISSN： 1571-9960
Mathematical modelling of borehole grouting in permafrost Peer-reviewed

Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida

Elsevier Geo-Engineering Book Series　2　(C)　773-778　2004

DOI： 10.1016/S1571-9960(04)80132-0 　

ISSN： 1571-9960
Creep and fracture strength of rare earth doped ceria Peer-reviewed

F Iguchi, Y Endo, T Ishida, K Sato, T Hashida, H Yugami

SOLID STATE IONICS: THE SCIENCE AND TECHNOLOGY OF IONS IN MOTION　179-186　2004
Consolidation of multi-walled carbon nanotube and hydroxyapatite coating by the spark plasma system (SPS) Peer-reviewed

M Omori, A Okubo, M Otsubo, T Hashida, K Tohji

BIOCERAMICS 16　254-2　395-398　2004

DOI： 10.4028/www.scientific.net/KEM.254-256.395 　

ISSN： 1013-9826
Numerical Simulation of the Formation of Distributed Microcrack Zone Induced by Hydraulic Fracturing Peer-reviewed

M. Itaoka, K. Sato, T. Hashida

Transactions of the Japan Society of Mechanical Engineers　70　(689)　114-119　2004/01
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.70.114 　

ISSN： 0387-5008

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A number of rock types exhibit a nonlinear deformation induced by distributed microcracking, followed by a post-peak softening behavior due to grain bridging action, when subjected to a uniform tension. Numerical analyses of hydraulically induced geothermal reservoirs at great depths conducted to date neglect the effect of the distributed microcracking. In this paper, the formation of the distributed microcracking is studied using a numerical technique in order to characterize the growth of artificial subsurface cracks by hydraulic fracturing. A numerical fracture model based on a finite element method is developed. The progressive nonlinear deformation is analyzed on the basis of the Rankine criterion. A cohesive crack model is adopted to analyze the crack growth. In the numerical simulation, the crack is represented using an embedded crack element. The results obtained by numerical analyses show that the distributed microcrack zone induced by hydraulic fracturing at great depth conditions is significantly suppressed by tectonic stress. An energy consumption of the distributed microcrack zone is much smaller than that of the bridging zone.
Biocompatibility of carbon nanotube disk Peer-reviewed

Y Sato, M Ohtsubo, B Jeyadevan, K Tohji, K Motomiya, R Hatakeyama, G Yamamoto, M Omori, T Hashida, K Tamura, T Akasaka, M Uo, A Yokoyama, F Watari

NANOSENSING: MATERIALS AND DEVICES　5593　623-627　2004

DOI： 10.1117/12.579687 　

ISSN： 0277-786X
High-pressure hydraulic stimulation of geothermal reservoir Peer-reviewed

Sergei Fomin, Toshiyuki Hashida, Vladimir Chugunov

American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED　260　687-693　2004

DOI： 10.1115/IMECE2004-61444 　

ISSN： 0888-8116
Heat flow rate at a bore-face and temperature in the multi-layer media surrounding a borehole Peer-reviewed

Chugunov, V, S Fomin, T Hashida

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER　46　(25)　4769-4778　2003/12

DOI： 10.1016/S0017-9310(03)00335-1 　

ISSN： 0017-9310
ポリビニルアルコール繊維複合セメント系押出成形材料のマルチプルクラック発生条件に関する破壊力学的研究 Peer-reviewed

Hiroyuki Takashima, Hideaki Nishimatsu, Kiyotaka Miyagai, Toshiyuki Hashida

Proceedings of JCI Symposium on Ductile Fiber reinforced Cementitous Composites (DFRCC)　23-30　2003/12
Analytical modelling of the formation temperature stabilization during the borehole shut-in period Peer-reviewed

S Fomin, Chugunov, V, T Hashida

GEOPHYSICAL JOURNAL INTERNATIONAL　155　(2)　469-478　2003/11

DOI： 10.1046/j.1365-246X.2003.02054.x 　

ISSN： 0956-540X
Fractal concept in numerical simulation of hydraulic fracturing of the hot dry rock geothermal reservoir Peer-reviewed

S Fomin, T Hashida, A Shimizu, K Matsuki, K Sakaguchi

HYDROLOGICAL PROCESSES　17　(14)　2975-2989　2003/10

DOI： 10.1002/hyp.1445 　

ISSN： 0885-6087
Chemical, Hydrogical, and Mechanical factors on Water/Rock Interaction in HDR Geothermal Systems Peer-reviewed

Fomin, Z. Jing, T. Hashida

Proceedings of International Conference on Coupled T-H-M-C Processes in Geo-systems: Fundamentals, Modelling, Experiments & Applications　647-652　2003/10
Supercritical Water/Rock Interactions and Generation of Artificial Geothermal Reservoirs in Deep-Seated High Temperature Rock Masses Peer-reviewed

Toshiyuki Hashida, Toru Takahashi

Proceedings of International Conference on Coupled T-H-M-C Processes in Geo-systems: Fundamentals, Modelling, Experiments & Applications　659-664　2003/10
Microcrack Formation and Fracture Characteristics in Granite Under Supercritical Water Conditions Peer-reviewed

Toru Takahashi, Toshiyuki Hashida

Proceedings of International Conference on Coupled T-H-M-C Processes in Geo-systems: Fundamentals, Modelling, Experiments & Applications　683-688　2003/10
Mathematical Modelling of Borehole Grouting in Permafrost Peer-reviewed

Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida

Proceedings of International Conference on Coupled T-H-M-C Processes in Geo-systems: Fundamentals, Modelling, Experiments & Applications　769-774　2003/10
CO2 injection to granite and sandstone in experimental rock/hot water systems Peer-reviewed

LH Liu, Y Suto, G Bignall, N Yamasaki, T Hashida

ENERGY CONVERSION AND MANAGEMENT　44　(9)　1399-1410　2003/06

DOI： 10.1016/S0196-8904(02)00160-7 　

ISSN： 0196-8904
A design approach for the mechanical properties of polypropylene discontinuous fiber reinforced cementitious composites by extrusion molding Peer-reviewed

H Takashima, K Miyagai, T Hashida, VC Li

ENGINEERING FRACTURE MECHANICS　70　(7-8)　853-870　2003/05

DOI： 10.1016/S0013-7944(02)00154-6 　

ISSN： 0013-7944
Development of a method for CO2 solidification of glass and concrete waste composites Peer-reviewed

LH Liu, T Hashida, S Teramura, K Karino

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN　111　(5)　357-361　2003/05

DOI： 10.2109/jcersj.111.357 　

ISSN： 1882-0743

eISSN： 1348-6535
Determination of interface fracture toughness in thermal barrier coating system by blister tests Peer-reviewed

YC Zhou, T Hashida, CY Jian

JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME　125　(2)　176-182　2003/04

DOI： 10.1115/1.1555658 　

ISSN： 0094-4289
Fundamentals of steady-state non-Newtonian rimming flow Peer-reviewed

S Fomin, T Hashida, J Watterson

JOURNAL OF NON-NEWTONIAN FLUID MECHANICS　111　(1)　19-40　2003/03

DOI： 10.1016/S0377-0257(03)00010-7 　

ISSN： 0377-0257
Numerical Model for the Fracture Type Geothermal Reservoir with the Multi-Borehole System Peer-reviewed

Sergei Fomin, Kei Yoshida, Toshiyuki Hashida

Proceedings of The 6th ASME-JSME Thermal Engineering Joint Conference　2003　(6)　69-69　2003/03
Publisher:

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An improved three-dimensional simulating model (FRACSIM-3D) for heat and fluid flow within a geothermal reservoir is presented. The model effectively simulates two main stages of the geothermal reservoir exploitation, namely, the hydraulic stimulation of the existing natural fracture of the Hot Dry Rock (HDR) reservoir and the forced convection through the fracture media when the filtrating fluid extracts the heat from the hot rock and delivers it to the production wells. Modeling of the first stage incorporates the mechanical rock-fluid interaction during hydraulic stimulation and quantitatively predicts the 3D reservoir growth behavior. In this model the pre-existing fractures are generated stochastically. The fractal size distribution of the penny-shaped fractures with random orientation is assumed. The fractal fracture radius γ distribution is modeled by equation γ_α=((1-α)γ^<-D>_<min>+αγ^<-D>_<max>)^<-1/D>; where α is a random parameter in the interval [0,1]; γ_<min> and γ_<max> are the lower and upper fracture radius limits, respectively; D is fractal dimension of the fracture length (radius) distribution. Thus, for the purpose of simulation, it is necessary to specify the length of the smallest and largest fractures, as well as fractal dimension D. The fluid flow is approximated by the Darcy law equation. Pressure distribution within the fracture rock is used for calculating the growth of the cracks apertures and shear displacements. This requires several iterations; solving the complete flow model simulating the fracture system anew each time and recalculating the shear displacement using the inner fracture pressure from the previous iteration. The heat extraction stage of the reservoir exploitation is simulated by the unsteady energy conservation equation. Since the flow rate within the reservoir is relatively high, the mathematical model accounts for the effect of thermal dispersion. Since the heat accumulated by the fluid within the system of injection boreholes can constitute the substantial fraction of the total thermal output of the geothermal power plant, the model of heat and mass transfer in the fractured media at the heat extraction stage should be coupled with the equations which describe the heat transport in the system of injection and production wells. Mathematical model of heat flow within the multi-borehole circulating system is proposed in this study. The schematic sketch of the multi-borehole system under consideration, which has a number of injection wells and one production well, is presented in figure below. [figure] On the basis of this model the major parameters that affects the thermal productivity of the geothermal power plant are analyzed. The effective regimes of the fluid circulation and optimal geometry of the multi-borehole system are proposed.
Mathematical Modelling of the Heat Transfer Between the well and Surrounding Rocks Peer-reviewed

Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida, Seiji Saito, Yuko Suto

Proceedings of The 6th ASME-JSME Thermal Engineering Joint Conference　TED-AJ03-203　(6)　230-230　2003/03
Publisher:

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Assessment of the heat either delivered from the high temperature rocks to the borehole or transmitted to the formation from the circulating fluid is of crucial importance for a number of technological processes related to borehole drilling or exploitation. Normally the temperature fields in the well and surrounding rocks are calculated numerically by the finite difference method or analytically, applying the Laplace-transform method. The obtained formulae are rather bulky and require tedious non-trivial numerical evaluations. Moreover, in the publications where the solution is obtained analytically heat interactions of circulating fluid and with formation was treated under condition of constant bore-face temperature. In the present study the temperature field in the formation disturbed by the heat flow from the borehole is modeled by the heat conduction equation and thermal interaction of the circulating fluid with formation is approximated by the Newton relationship on the bore-face. The problem is solved analytically by the heat balance integral method, where the radius of thermal influence, which defines the thermally disturbed domain, is function of time that can be found from the algebraic equation. Within this method the approximate solution of the heat conduction problem is sought in the form of a finite sum of functions which belong to a complete set of the linearly independent functions defined on the finite interval bounded by the radius of thermal influence and satisfy the homogeneous boundary condition on the bore-face. It can be proved theoretically that the approximate solution found by this method converges to the exact one. In the present study the first and the second order approximations are obtained. Numerical results illustrates that second approximation is in a quite good agreement with the exact solution. The only one shortcoming of this solution is that it depends on the radius of thermal influence, which is the implicit function or time determined by the algebraic equation. In order to eliminate this complication, in this study on the basis of the approximate solution the new approximate formulae for the radius of thermal influence, which asymptotically coincides with the implicit one, is proposed as l(Fo)≈1+A(Bi)√<Fo>, where Bi=h_wr_w/k_S, Fo=τD_S/(r_w)^2,τ is time D_S is heat diffusivity of the formation, r_w is radius of the borehole, k_S is heat conductivity of the formation, h_w is heat transfer coefficient on the bore-face. The behavior of parameter A versus Bi is found comparing the approximate solution with the exact one and employing the non-linear regression method. The latter leads to A(Bi)=(2.084+0.704Bi)/(1.554+0.407Bi). For the constant temperature on the bore-face the heat flux on the bore-face can be computed with an approximate formula q^^&acd;(Fo)≈1/{1+Biln[1+A(Bi)√<Fo>]}. The correctness of this approximate solution is validated by comparison with an exact analytical solution found by Carslaw and Jaeger. Due to the Duhamel theorem for the arbitrary temperature on the bore-face the heat flux and bore-face temperature can be presented respectively as q_w=T_L(z, Fo)+∫^^<Fo>__0T_L(z, p)∂/(∂Fo)q^^&acd;(Fo-p)dp and T|_<r=1>=-∫^^<Fo>__0T_L(z, p)∂/(∂Fo)q^^&acd;(r, Fo-p)dp , where T_L(z, Fo) accounts for the thermal history of the formation temperature and possible axial (along the vertical axis z) variation of generally unsteady temperature in the borehole.
Development of a method for CO2 solidification of glass and concrete waste composites Peer-reviewed

Lihui Liu, Toshiyuki Hashida, Satoshi Teramura, Kimitoshi Karino

Journal of the Ceramic Society of Japan　111　(1293)　357-361　2003
Publisher: Ceramic Society of Japan
DOI： 10.2109/jcersj.111.357 　

ISSN： 0914-5400
Computer simulation of fluid flow in fractured media. Effect of thermal dispersion Peer-reviewed

K Yoshida, A Shimizu, S Fomin, T Hashida

SIXTH INTERNATIONAL WORKSHOP ON NONDESTRUCTIVE TESTING AND COMPUTER SIMULATIONS IN SCIENCE AND ENGINEERING　5127　207-215　2003

ISSN： 0277-786X
Simulation of the fracture shear dilation Peer-reviewed

S Fomin, A Shimizu, K Matsuki, K Sakaguchi, T Hashida

SIXTH INTERNATIONAL WORKSHOP ON NONDESTRUCTIVE TESTING AND COMPUTER SIMULATIONS IN SCIENCE AND ENGINEERING　5127　216-221　2003

ISSN： 0277-786X
Permeability enhancement by microfracturing in granite under supercritical water conditions Peer-reviewed

T Takahashi, K Tanifuji, C Stafford, T Hashida

JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING　46　(1)　24-29　2003/01

DOI： 10.1299/jsmea.46.24 　

ISSN： 1344-7912
Thermal Extraction from Supercritical Rock Masses Peer-reviewed

Toshiyuki Hashida

地熱エネルギー　28　(1)　67-80　2003
Energy release rate of functionally graded materials with interface edge-cracks under uniform temperature change Peer-reviewed

PC Zhai, T Hashida, QJ Zhang

FUNCTIONALLY GRADED MATERIALS VII　423-4　613-618　2003

ISSN： 0255-5476
Influence of Thermal Aging on Interface Delamination of Thermal Barrier Coatings Peer-reviewed

Takamasa Onoki, Tetsuro Tonomori, Kazuhiro Ogawa, Toshiyuki Hashida, Tetsuo Shoji, Masahide Maruyama, Hiroyuki Togashi, Taiji Torigoe

Zairyo/Journal of the Society of Materials Science, Japan　52　(7)　807-814　2003
Publisher: Society of Materials Science Japan
DOI： 10.2472/jsms.52.807 　

ISSN： 0514-5163
Effect of Perlite Addition on Fracture Properties of Discontinuous Fiber-reinforced Cementitious Composites Manufactured by Extrusion Molding Peer-reviewed

Hiroyuki Takashima, Hideaki Nishimatsu, Kiyotaka Miyagai, Toshiyuki Hashida

Proceedings of the Japan Concrete Institute (JCI) Annual Meeting　25　(1)　239-244　2003
Publisher:
ISSN： 1347-7560
Numerical Simulation of the Large-Scale Geothermal Reservoir With Multiple-Borehole-Circulation System Peer-reviewed

K. Yoshida, S. Fomin, T. Hashida

Geothermal Resources Council Transactions　27　747-751　2003
Bonding Hydroxyapatite Ceramics and Titanium by Hydrothermal Hot-pressing Method Peer-reviewed

Takamasa Onoki, Toshiyuki Hashida, Kazuyuki Hosoi

Journal of The Japanese Bio-Electrical Research Society (JJBERS)　17　21-23　2003
Role of NH⁴⁺ on the Formation of Hydroxyapatite Ceramics with Lamellar Structure by Hydrothermal Hot-Pressing Peer-reviewed

Jungo Li, Takamasa Onoki, Lihui Liu, Toshiyuki Hashida

Journal of The Japanese Bio-Electrical Research Society (JJBERS)　17　27-33　2003
Numerical Simulation of the Fracture Type Reservoir Growth During Hydraulic Fracturing Peer-reviewed

Sergei Fomin, Ayumu Shimizu, Toshiyuki Hashida

International Journal of Strength　1　(2)　69-77　2003
Numerical Simulation of Crack Propagation and Coalescence in Randomly Distributed Crack System Peer-reviewed

Kazushi Sato, Akihide Saimoto, Toshiyuki Hashida, Yasufumu Imai

Strength, Fracture and Complexity　1　(4)　205-213　2003
Simulation of the compressive fracture of brittle and disordered solids Peer-reviewed

A Saimoto, Y Imai, T Hashida, H Nisitani

PROGRESS IN EXPERIMENTAL AND COMPUTATIONAL MECHANICS IN ENGINEERING　243-2　(2)　285-290　2003

ISSN： 1013-9826
Joining hydroxyapatite ceramics and titanium alloys by hydrothermal method Peer-reviewed

T Onoki, K Hosoi, T Hashida

BIOCERAMICS 15　240-2　571-574　2003

ISSN： 1013-9826
The genesis of echelon-mode-I cracks in the neighbourhood of a mode-II-crack tip under uniaxial compression Peer-reviewed

A Saimoto, Y Imai, T Hashida

ADVANCES IN FRACTURE AND DAMAGE MECHANICS　251-2　(2)　327-332　2003

ISSN： 1013-9826
Delamination cracking in thermal barrier coating system Peer-reviewed

YC Zhou, T Hashida

JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME　124　(4)　922-930　2002/10

DOI： 10.1115/1.1477194 　

ISSN： 0742-4795
Contact melting inside an elastic capsule Peer-reviewed

AV Wilchinsky, SA Fomin, T Hashida

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER　45　(20)　4097-4106　2002/09

DOI： 10.1016/S0017-9310(02)00121-7 　

ISSN： 0017-9310

eISSN： 1879-2189
Creep property measurement of service-exposed SUS 316 austenitic stainless steel by the small-punch creep-testing technique Peer-reviewed

ML Saucedo-Munoz, S Komazaki, T Takahashi, T Hashida, T Shoji

JOURNAL OF MATERIALS RESEARCH　17　(8)　1945-1953　2002/08

ISSN： 0884-2914
Fracture characteristics of thermal barrier coatings after tensile and bending tests Peer-reviewed

YC Zhou, T Tonomori, A Yoshida, L Liu, G Bignall, T Hashida

SURFACE & COATINGS TECHNOLOGY　157　(2-3)　118-127　2002/08

DOI： 10.1016/S0257-8972(02)00154-8 　

ISSN： 0257-8972
Examination of solidified waste glass powder after hydrothermal hot pressing Peer-reviewed

N Yamasaki, A Shirakawa, N Hirano, T Hashida

JOURNAL OF MATERIALS SCIENCE LETTERS　21　(9)　711-713　2002/05

DOI： 10.1023/A:1015785021932 　

ISSN： 0261-8028
Lithiation reactions of Zn- and Li-birnessites in non-aqueous solutions and their stabilities Peer-reviewed

LH Liu, Q Feng, K Yanagisawa, G Bignall, T Hashida

JOURNAL OF MATERIALS SCIENCE　37　(7)　1315-1320　2002/04

DOI： 10.1023/A:1014504125281 　

ISSN： 0022-2461
Evaluation of thermal aging embrittlement of austenitic stainless steels JN1, JJ1, and JK2 by cryogenic small-punch testing Peer-reviewed

ML Saucedo-Munoz, SC Liu, SI Komazaki, IH Kwon, T Hashida, H Takahashi, H Nakajima

JOURNAL OF MATERIALS RESEARCH　17　(4)　852-860　2002/04

DOI： 10.1557/JMR.2002.0124 　

ISSN： 0884-2914
A 3-D water/rock chemical interaction model for prediction of HDR/HWR geothermal reservoir performance Peer-reviewed

ZZ Jing, K Watanabe, J Willis-Richards, T Hashida

GEOTHERMICS　31　(1)　1-28　2002/02

DOI： 10.1016/S0375-6505(00)00059-6 　

ISSN： 0375-6505
Thermal fatigue failure induced by delamination in thermal barrier coating Peer-reviewed

YC Zhou, T Hashida

INTERNATIONAL JOURNAL OF FATIGUE　24　(2-4)　407-417　2002/02

DOI： 10.1016/S0142-1123(01)00096-2 　

ISSN： 0142-1123
Mathematical modeling of the geothermal reservoir with multi-borehole circulating system Peer-reviewed

Sergei Fomin, Kei Yoshida, Vladimir Chugunov, Toshiyuki Hashida

American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD　372　(6)　247-254　2002

DOI： 10.1115/IMECE2002-33895 　

ISSN： 0272-5673
Thermal fatigue in thermal barrier coating Peer-reviewed

YC Zhou, T Hashida

JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING　45　(1)　57-64　2002/01

DOI： 10.1299/jsmea.45.57 　

ISSN： 1344-7912
Dependence of the Rate of Granite Dissolution on Temperature and Fluid Velocity under Simulated Geothermal Reservoir Environments Peer-reviewed

Yuko Suto, Koji Tanifuji, Toshiyuki Hashida, Tetsuo Shoji, Hideaki Takahashi, Kimio Watanabe

Journal of the Geothermal Research Society of Japan　24　(1)　47-56　2002

DOI： 10.11367/grsj1979.24.47 　

ISSN： 1883-5775 0388-6735
Mathematical Modeling of Convection Heat Transfer in a Geothermal Reservoir of Fractal Geometry Peer-reviewed

Sergei Fomin, Ayumu Shimizu, Toshiyuki Hashida

Proceedings of the Twelfth International Heat Transfer Conference, August 18-23, 2002, Grenoble, France, Edited by Jean Taine, Elsevier SAS　809-814　2002
Bonding property of Hydroxyapatite and Titanium Treated with Hydrothermal Alkali Solution Peer-reviewed

T. Onoki, K. Hosoi, T. Hashida

Proceedings of 5th International Conference on Solvo-Thermal Reactions, (July 22-26, 2002, East Brunswick Hilton, East Brunswick, NJ), Edited by Richard E. Riman　250-253　2002
Fracture Properties of Discontinuous Fiber Reinforced Cementitious Composites Manufactured by Extrusion Molding Peer-reviewed

Hiroyuki Takashima, Kiyotaka Miyagai, Toshiyuki Hashida

Proceedings of the JCI International Workshop on Ductile Fiber Reinforced Cementitious Composites 社Application and Evaluation- (October 21-22, 2002, Takayama, Japan)　75-83　2002
Numerical Simulation of Geothermal Reservoir Formation Induced by Hydraulic Fracturing at Great Depth Peer-reviewed

Mikiyo Itaoka, Kazushi Sato, Toshiyuki Hashida

Geothermal Resources Council Transactions　26　297-302　2002
Analysis of Thermal Effectiveness of Geothermal Multi-Borehole Circulating System Peer-reviewed

S. Fomin, K. Yoshida, T. Hashida

Geothermal Resources Council Transactions　26　279-283　2002
Heat Flux on the Bore-Face and Temperature Distribution in the Formation Peer-reviewed

Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida, Seiji Saito, Yuko Suto

Geothermal Resources Council Transactions　26　803-807　2002
Conditions of Multiple Cracking for Polypropylene Discontinuous Fiber Reinforced Cementitious Composites Manufactured by Extrusion Molding Peer-reviewed

Hiroyuki Takashima, Kiyotaka Miyagai, Toshiyuki Hashida, Victor C. Li

Journal of Concrete Research and Technology　13　(1)　1-11　2002/01
Publisher:
DOI： 10.3151/crt1990.13.1_1 　

ISSN： 1340-4733
FEM Simulation of Mixed Mode Crack Propagation Induced by Hydraulic Fracturing Peer-reviewed

Kazushi Sato, Mikio Itaoka, Toshiyuki Hashida

Proceedings of 10th International Conference on Fracture, (December 2-6, 2001, Honolulu), (CD-ROM)　2001/12
Thermal Failure of Thermal Barrier Ceramic Coating Peer-reviewed

Y.C. Zhou, T. Hashida

Proceedings of 10th International Conference on Fracture, (December 2-6, 2001, Honolulu), (CD-ROM)　2001/12
Fundamental Research for CO₂ Injection into Granite and Sandstone, in Experimental Hot Water Systems Peer-reviewed

L. Liu, Y. Suto, G. Bignall, N. Yamasaki, T. Hashida

Proceedings of the 23rd New Zealand Geothermal Workshop, (November 7-9, 2001, The University of Auckland, New Zealand)　21-26　2001/11
Fracture Generation in Artificial Geothermal Reservoirs Under Supercritical Water Conditions Peer-reviewed

Toru Takahashi, Koji Tanifuji, Catherine Stafford, Toshiyuki Hashida

Proceedings of the 23rd New Zealand Geothermal Workshop, (November 7-9, 2001, The University of Auckland, New Zealand)　63-67　2001/11
Correlationship between J(IC) and equivalent fracture strain determined by small-punch tests in JN1, JJ1 and JK2 austenitic stainless steels Peer-reviewed

ML Saucedo-Munoz, SC Liu, T Hashida, H Takahashi, H Nakajima

CRYOGENICS　41　(10)　713-719　2001/10

DOI： 10.1016/S0011-2275(01)00135-7 　

ISSN： 0011-2275
Preparation and Mechanical Properties of Hydroxyapatite Ceramics by Hydrothermal Hot Pressing at Low Temperature Peer-reviewed

Jungo Li, Takamasa Onoki, Lihui Liu, Atsushi Nakahira, Toshiyuki Hashida

Proc. of Asian Pacific Conference on Fracture and Strength '01 and Int. Conference on Advanced Technology in Experimental Mechanics '01, (October 20-22, 2001, Sendai, Japan)　2　1068-1073　2001/10
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeatemapcfs.2.01.03.0_1068 　

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Hydroxyapatite (HAp) ceramics were prepared by hydrothermal hot pressing (HHP) processes through the reaction between octacalcium phosphate (OCP) and ammonia water, at 300℃. When the amount of ammonia was over the chemical stechiometric ratio, pure HAp ceramics was obtained. The high concentration of ammonia water was advantageous for the solidification of the HAp ceramics. The appropriate amount of water improved the toughness, but greatly reduced the tensile strength. With addition of 10% high concentration ammonia water, HAp ceramic was achieved at 300℃ by HHP method. The density, fracture toughness, and tensile strength of the ceramics reached 2.82g/cm^3, 1.07MPam^<1/2>, and 18.2MPa, respectively. The present study demonstrated that the HHP method was a useful method for preparing HAp ceramics at low temperature.
Small Punch Creep Behavior of Service-Exposed SUS316HTB Superheater Tubes of Fossil Boilers Peer-reviewed

Shin-ichi Komazaki, Maribel L. Saucedo-Munoz, Toru Takahashi, Toshiyuki Hashida, Tetsuo Shoji

Proc. of Asian Pacific Conference on Fracture and Strength '01 and Int. Conference on Advanced Technology in Experimental Mechanics '01, (October 20-22, 2001, Sendai, Japan)　1　316-321　2001/10
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeatemapcfs.1.01.203.0_316 　

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A small punch creep testing technique using miniaturized specimen with a dimension of 10 × 10 × 0.3^t mm has been demonstrated for evaluating change in creep property of high temperature components due to long-term service operation. This technique was applied to SUS 316 HTB secondary superheater boiler tube actually used for 100,600 h in a fossil power plant. The overall shapes of the creep curves determined by the small punch creep test were similar to those obtained from a conventional uniaxial creep test. That is, they exhibited clearly three creep stages. The extent of secondary creep stage and rupture time t_r decreased with a increase of testing load level. The creep rupture life of the service-exposed tube was shorter than that of the unexposed tube at a temperature of 650℃ and at high load levels, i.e. 338 N and 408 N. However, to the contrary, the former became longer than the latter at relatively low load levels, i.e. 234 N and 286 N. The difference in rupture life between them had a tendency to increase with a decrease of testing load level. These small punch creep behaviors of SUS 316 HTB superheater boiler tubes have been examined from a metallographic point of view.
Crack Healing and Micro-crack Formation in Granite under the Presence of High Temperature and Pressurized Water Peer-reviewed

Yasushi Fujii, Koji Tanifuji, Catherine Stafford, Toru Takahashi, Toshiyuki Hashida

Proc. of Asian Pacific Conference on Fracture and Strength '01 and Int. Conference on Advanced Technology in Experimental Mechanics '01, (October 20-22, 2001, Sendai, Japan)　2　1041-1046　2001/10
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeatemapcfs.2.01.03.0_1041 　

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As a part of a research programme investigating the geothermal reservoir potential of deep-seated high-temperature rock masses, experiments have been undertaken to determine the crack behaviour induced by hot-rock/water interaction. Cylindrical specimens of Iidate Granite were heated, whilst subject to static water conditions, under some confining pressure. The effect of temperatures of up to 600℃ was investigated, whilst the pore fluid and confining pressures were maintained at 50 and 100 MPa respectively. The time-dependence of the water/rock interaction, under these conditions, was also determined, with experiments ranging in duration from 0.5 to 96 hours. Experiments to date, have investigated the quartz constituent of the Iidate Granite samples and results show that crack healing in quartz grains is significant at temperatures of 330℃ and above. This temperature effect is also enhanced with increasing time. No crack healing in quartz is observed at temperatures of 250℃. Additional experiments, using the indentation fracture method, show that these healed cracks recover strength to that of the matrix quartz grains. Although these results might appear to indicate that significant permeability enhancement should not be expected in a supercritical geothermal reservoir, micro-structural data show that significant intragranular micro-cracking also occurs at the temperatures greater than 400℃ due to the water/rock interaction. This micro-cracking phenomenon results in an overall increase in the permeability of the granite. This research presents important results which require due consideration in the potential development of a supercritical deep-seated geothermal reservoir.
Numerical Analysis of Crack Growth Behavior Induced by Hydraulic Fracturing at Great Depth Peer-reviewed

Mikiyo Itaoka, Kazushi Sato, Toshiyuki Hashida

Proc. of Asian Pacific Conference on Fracture and Strength '01 and Int. Conference on Advanced Technology in Experimental Mechanics '01, (October 20-22, 2001, Sendai, Japan)　1　523-528　2001/10
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeatemapcfs.1.01.203.0_523 　

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Geothermal energy is one of the most environment-conscious resources among the natural resources. Recently, the development of a supercritical geothermal system at great depth has been proposed to enhance the geothermal heat extraction. In order to design the supercritical geothermal reservoir whose temperature and pressure conditions exceed the critical point of water, the formation behavior of the geothermal reservoir under the great depth conditions has to be examined. In this study, we develop a new numerical analysis code for analyzing the hydraulic fracturing behavior in deep-seated rock mass. This code consists of two parts: "flow analysis" which computes the pressure distribution in the induced crack, and "crack propagation analysis". The former is based on a finite difference method. The later is based on a finite element method with embedded crack element. In the "crack propagation analysis", the mixed-mode fracture behavior with process zone formation is modeled. A shear dilation is accounted for in the fracture model. The numerical results show that the crack growth behavior, i.e. the mode of crack propagation depends on the depth. Under a typical tectonic stress condition, the crack growth mode is dominated by the opening fracture mode above the depth of 4 - 5 km, whereas the influence of the shear fracture mode increases with increasing the depth. This result may suggest that the current target of supercritical geothermal reservoirs may be formed mainly under the opening fracture mode.
Simulation of Complexity in Failure Process of Rock under Biaxial Compression Peer-reviewed

Akihide Saimoto, Yasufumi Imai, Toshiyuki Hashida

Proc. of Asian Pacific Conference on Fracture and Strength '01 and Int. Conference on Advanced Technology in Experimental Mechanics '01, (October 20-22, 2001, Sendai, Japan)　551-556　2001/10
Fracture Behavior of a Hydroxyapatite-Metal Interface Jointed by Hydrothermal Hot-pressing Method Peer-reviewed

Takamasa Onoki, Kazuyuki Hosoi, Toshiyuki Hashida

Proc. of Asian Pacific Conference on Fracture and Strength '01 and Int. Conference on Advanced Technology in Experimental Mechanics '01, (October 20-22, 2001, Sendai, Japan)　1　511-516　2001/10
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeatemapcfs.1.01.203.0_511 　

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Solidificatioin of hydroxyapatite (HAp) and its bonding with titanium (Ti) was achieved simultaneously by using a hydrothermal hot-pressing method at the low temparaure as low as 150℃. A mixture of calcium hydrogen phosphate dihydrate and calcium hydroxide was used as a starting powder material for solidifying HAp. The joining behavior of HAp and Ti depended on the surface finishing condition of the titanium. From Raman spectroscopy of the Ti surfaces, it was found that TiO_2 formed at the Ti surface affected the bonding characteristics of the HAp/Ti interface. 3-point bending tests were conducted to obtain an estimate of the fracture toughness for the HAp/Ti interface as well as for the HAp ceramics only. Core-based specimens were used for the fracture toughness tests and a pre-crack was introduced along the HAp/Ti interface of the bonded specimens. The fracture toughness tests showed that the induced crack from the pre-crack tip deviated from the HAp/Ti interface and propagated into the HAp. The fracture toughness determined on the HAp/Ti specimen was closed to that of the HAp ceramics only (〜0.30MPa).
Permeability Enhancement by Microfracturing in Granite under Supercritical Water Conditions Peer-reviewed

Toru Takahashi, Kenji Hashimoto, Koji Tanifuki, Toshiyuki Hashida

Proc. of Asian Pacific Conference on Fracture and Strength '01 and Int. Conference on Advanced Technology in Experimental Mechanics '01, (October 20-22, 2001, Sendai, Japan)　1　547-550　2001/10
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeatemapcfs.1.01.203.0_547 　

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A prediction of host rock permeability in the deep seated geothermal reservoir is essential for the assessment of a potential geothermal energy extraction system. In order to test the permeability of granite under high temperature and high pressure conditions, experiments were undertaken using thick-walled cylindrical specimen of 45 mm outer diameter and 5 mm inner diameter. The permeability of the sample specimen was estimated from flow rate, and the pressure difference between borehole pressure (internal pressure) and confining pressure, based on Darcy's law. Permeability tests were conducted at temperatures of up to 600 ℃ and confining pressures of up to 100 MPa. Experimental results show that the permeability of granite increased with increasing temperature, particularly above 350 ℃. Examination of microcracks, by optical microscopy, showed that crack density in granite, after experiments at 600 ℃, and confining pressures of both 25 MPa and 100 MPa, was larger than at a confining pressure of 20 MPa. This indicates that water-rock interaction processes at supercritical conditions directly affect micro-cracking of granite. In addition, it was noted that hydrothermal cracking occurs at a temperature above 400 ℃ and a pore pressure above 25 MPa, This result indicates that it may be possible to increase granite permeability and to create a porous type reservoir in a supercritical rock mass, by hydrothermal cracking.
Numerical Simulation of the Hijiori Geothermal Reservoir Hydraulic Stimulation Peer-reviewed

Ayumu Shimizu, Sergei Fomin, Kimio Watanabe, Toshiyuki Hashida

Proc. of Asian Pacific Conference on Fracture and Strength '01 and Int. Conference on Advanced Technology in Experimental Mechanics '01, (October 20-22, 2001, Sendai, Japan)　1　540-546　2001/10
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeatemapcfs.1.01.203.0_540 　

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In this paper an improved three-dimensional simulation model (FRACSIM-3D) is presented. It incorporates the mechanical rock-fluid interaction during hydraulic stimulation in more rigorous way than the existing two-dimensional model FRACSIM-2D and quantitatively predicts the 3D reservoir growth behavior. In this model the pre-existing fractures are generated stochastically. The fractal size distribution of the penny-shaped fractures with random orientation is assumed. The fluid flow through the discrete fracture network is simulated by mapping the connectivity of the fractured rock to a regular cubic grid under condition of constant injection pressure. The fluid flow is approximated by the Darcy law equation. Pressure distribution within the fractured rock is used for calculating the growth of the cracks apertures and shear displacements. This requires several iterations; solving the complete flow model simulating the fracture system anew each time and recalculating the shear displacement using the inner fracture pressure from the previous iteration. The results of this numerical solution for hydraulic stimulation are in good agreement with the existing field data collected at the Hijiori hot-dry-rock (HDR) reservoir.
Fracture Characteristic of Plasma-Sprayed Thermal Barrier Coating in Tension and Bending Test Peer-reviewed

Tetsuro Tonomori, Akira Yoshida, Yichun Zhou, Lihui Liu, Toshiyuki Hashida

Proc. of Asian Pacific Conference on Fracture and Strength '01 and Int. Conference on Advanced Technology in Experimental Mechanics '01, (October 20-22, 2001, Sendai, Japan)　2　1057-1062　2001/10
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeatemapcfs.2.01.03.0_1057 　

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In the present paper, a method for determining the fracture characteristic of the ceramic coat layer/bond coat interface was developed. The uniaxial tension and four point bending tests were conducted on plasma-sprayed rectangular specimens of two-layer system and functionally gradient material (FGM) layer. The top coat layer was yttria-partially-stabilized zirconia (YSZ) and the bond coat layer was MCrAlY, both of which were deposited by plasma-spraying technique. FGM consisted of 5 layers: 100% YSZ, 80%YSZ+20%NiCrAlY, 60%YSZ+40%NiCrAlY, 40%YSZ+60%NiCrAlY, 20%YSZ+80%NiCrAlY. The detailed fracture process in the thermal barrier coating system was examined by using scanning electron microscopy (SEM). It was shown that vertical multiple cracking preceded in the top coat followed by the propagation of interface crack between top coat and bond coat. A shear lag model was used to evaluate the interface strength. The experimental results show that FGM specimens have higher interface strength than non-FGM specimens.
Crack Growth of Non-Coplanar Parallel Crack Array and Tension-Softening Model Peer-reviewed

Kazushi Sato, Akihide Saimoto, Toshiyuki Hashida, Yasufumi Imai

Proc. of Asian Pacific Conference on Fracture and Strength '01 and Int. Conference on Advanced Technology in Experimental Mechanics '01, (October 20-22, 2001, Sendai, Japan)　1　157-161　2001/10
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeatemapcfs.1.01.203.0_157 　

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It is well known that the tension-softening model can describe the macroscopic fracture behavior of quasi-brittle materials containing pre-existing microcracks such as rocks, ceramics and concretes. The problem studied in this paper is a tension-softening behavior in brittle materials based on the growth of a non-coplanar parallel crack array. Crack growth analyses are performed numerically using the body force method. The problem calculated is a non-coplanar crack array subjected to uniform tensile stress at infinity. The plane strain condition is assumed. The maximum principal stress criterion is employed to determine the each crack growth direction and the global stress required for crack propagation. The tension-softening behavior is studied from the remote tensile stress and deformation of the numerical result. The deduced tension-softening curve is consistent with experimental data obtained for granites. This evidence revealed that the overlapping of non-coplanar cracks, i.e. the ligamentary bridging, is the main source of the tension-softening behavior of granites.
Failure Characteristics of Thermal Barrier Ceramic Coating at High Temperature Peer-reviewed

Y.C. Zhou, T. Hashida

Proc. of Asian Pacific Conference on Fracture and Strength '01 and Int. Conference on Advanced Technology in Experimental Mechanics '01, (October 20-22, 2001, Sendai, Japan)　1　292-296　2001/10
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeatemapcfs.1.01.203.0_292 　

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The paper presents the experimental investigation on the fracture of thermal barrier ceramic coating (TBC) at high temperature. The fracture was induced by temperature gradient along TBC system thickness direction and oxidation between TBC and bond coat. Laser heating method was used to simulate the operating state of TBC system. Both micro-observation and acoustic emission (AE) detection revealed that fatigue crack was in two forms: surface crack and interface delamination. One can understand the failure mechanism from the plane of TBC surface temperature and substrate surface temperature. It was found that the life of thermal fatigue was reduced by the formation of alumina at interface. On the other hand, it was found that the temperature gradient between inner and outer surface of specimen accelerated the growth of alumina layer.
Residual Stress in PZT Thin Film Determined by Indentation Fracture Method Peer-reviewed

Y.C. Zhou, Z.Y. Yang, X.J. Zheng, T. Hashida, J.Y. Li

Proc. of Asian Pacific Conference on Fracture and Strength '01 and Int. Conference on Advanced Technology in Experimental Mechanics '01, (October 20-22, 2001, Sendai, Japan)　2　(1)　988-993　2001/10
Publisher: The Japan Society of Mechanical Engineers

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In the investigation, the piezoelectric thin film Pb(Zr_xTi_<1-x>)O_3(PZT) was prepared by a pulse laser deposition method. The properties of PZT films were strongly dependent on substrate temperature and oxygen pressures. The residual stress in piezoelectric thin film was tested by indentation fracture method. The relation of properties such as microstructures, piezoelectric response with residual stress was investigated. A theoretical model for the formation of residual stress is proposed. The model is based on the combined effects of the difference of thermal mismatch between substrate and thin film, the phase transformation and the different of lattice constant between thin film and substrate.
New Technique Development of High Temperature Creep Evaluation by Small Punch-Creep Test Peer-reviewed

Seung-Se Baek, Song-In Lee, I1-Hyun Kwon, Hyo-Sun Yu, Eui-Gyun Na, Jeong-Soo Ha, T. Hashida, Se-Hi Chung

Proc. of Asian Pacific Conference on Fracture and Strength '01 and Int. Conference on Advanced Technology in Experimental Mechanics '01, (October 20-22, 2001, Sendai, Japan)　1　309-315　2001/10
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeatemapcfs.1.01.203.0_309 　

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A small punch creep(SP-Creep) test using miniaturized specimen(10×10×0.5mm) has been described for the development of the new creep test method for structural components operated at high-temperature and pressure. The SP-Creep test technique has been applied to 9CrlMoVNb steel used as valve material in boiler components. The creep test temperatures were varied at 575℃〜625℃, and the applied loads at 40kg〜100kg. The overall deformations of SP-Creep curve were definitely depended on creep test conditions and showed the creep behaviors of three regions like those of conventional uniaxial tensile creep curve. The steady state creep rate (ε^・_<qf-ss>) in SP-Creep test increased with increase of applied load and creep temperature. Furthermore, the power law's exponent decreased with increase of creep temperature, and the activation energy(Q_<SPC>) obtained from SP-Creep test decreased as applied load increases. These behaviors were similar to those of conventional uniaxial creep test. Also, a predicting equation of SP-Creep rate was suggested and a good agreement between experimental and calculated values was shown. And several creep results of 9CrlMoVNb steel were compared with those of 2.25Cr-1Mo and 1Cr-0.5Mo steels that has been widely used as boiler tube and header materials, respectively.
Thermal Failure Mechanism of Thermal Barrier Ceramic Coating at High Temperature Peer-reviewed

Y. C. Zhou, T. Hashida

Proceedings of the Fourth International Congress on Thermal Stresses, (June 8-11, 2001, Osaka, Japan)　567-570　2001/08
Fracture Generation and Water-Rock Interaction Processes in Supercritical Deep-Seated Geothermal Reservoirs Peer-reviewed

T. Hashida, G. Bignall, N. Tsuchiya, T. Takahashi, K. Tanifuji

Geothermal Resources Council Transactions　25　225-229　2001/08
Thermal damage in particulate-reinforced metal matrix composites Peer-reviewed

Y. C. Zhou, S. G. Long, Z. P. Duan, T. Hashida

Journal of Engineering Materials and Technology, Transactions of the ASME　123　(3)　251-260　2001/07

DOI： 10.1115/1.1362675 　

ISSN： 0094-4289
Failure Analysis Procedure for Mixed-Mode Crack Growth Using Embedded Crack Element Peer-reviewed

Mikiyo Itaoka, Kazushi Sato, Toshiyuki Hashida

Transactions of the Japan Society for Computational Methods in Engineering　1　67-70　2001/07
Coupled effects of temperature gradient and oxidation on thermal stress in thermal barrier coating system Peer-reviewed

YC Zhou, T Hashida

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES　38　(24-25)　4235-4264　2001/06

DOI： 10.1016/S0020-7683(00)00309-7 　

ISSN： 0020-7683
Thermal Fatigue in Thermal Barrier Coating Peer-reviewed

Y. C. Zhou, T. Hashida

Proceedings of the 7th International Conference on Creep and Fatigue at Elevated Temperatures, (June 3-8, 2001, Tsukuba, Japan)　641-646　2001/06
Determination of Interface Fracture Toughness by Blister Tests: Theoretical Model Peer-reviewed

Y. C. Zhou, T. Hashida

Proceedings of Sixth International Conference on Biaxial/Multiaxial Fatigue & Fracture, (June 25-28, 2001, Lisboa, Portugal)　355-362　2001/06
Fracture of Thermal Barrier Ceramic Coating at High Temperature Peer-reviewed

Y. C. Zhou, T. Hashida

Proceedings of Sixth International Conference on Biaxial/Multiaxial Fatigue & Fracture, (June 25-28, 2001, Lisboa, Portugal)　967-974　2001/06
455 Numerical Simulation of Hydraulically Induced Fracture Propagation Process in Deep-Seated Rock Masses

ITAOKA Mikiyo, SATO Kazushi, HASHIDA Toshiyuki

Proceedings of the 1992 Annual Meeting of JSME/MMD　2001　461-462　2001
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmezairiki.2001.0_461 　
460 Effect of Hydrothermally-Induced Microcracks on Permeability of Granite under Supercritical Water Conditions

TAKAHASHI Toru, TANIFUJI Koji, HASHIDA Toshiyuki

Proceedings of the 1992 Annual Meeting of JSME/MMD　2001　471-472　2001
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmezairiki.2001.0_471 　
Degradation of yttria stabilized zirconia at 370 K under a low applied stress Peer-reviewed

JG Li, LM Zhang, Q Shen, T Hashida

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　297　(1-2)　26-30　2001/01

DOI： 10.1016/S0921-5093(00)01276-4 　

ISSN： 0921-5093
Design for the mechanical properties of polypropylene discontinuous fiber-reinforced cementitious composites manufactured by extrusion molding Peer-reviewed

H Takashima, K Miyagai, T Hashida, VC Li

FRACTURE MECHANICS OF CONCRETE STRUCTURES, VOLS 1 AND 2　1　115-122　2001
Study of Numerical Simulation Method for Hydraulically Induced Fracture Propagation in Deep-Seated Rock Mass Peer-reviewed

Mikiyo Itaoka, Kazushi Sato, Toshiyuki Hashida

Transactions of the Japan Society of Mechanical Engineers　67　(661)　119-126　2001
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.67.1527 　

ISSN： 0387-5008

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Geothermal energy is one of the most environment-conscious resources among the natural resources. Recently, the development of a supercritical geothermal system has been proposed to enhance the geothermal heat extraction. In order to design the supercritical geothermal reservoir whose temperature and pressure conditions exceed the critical point of water, the formation behavior of the geothermal reservoir under the great depth condition has to be examined. In this study, we develop a new numerical analysis code for analyzing the hydraulic fracturing behavior in deep-seated rock mass. This code consists of two parts : "flow analysis" which computes the pressure distribution in the induced crack, and "crack propagation analysis". The former is based on FDM. The later is based on FEM with embedded crack element. In the "crack propagation analysis", the mixed-mode fracture behavior with process zone formation is modeled. A shear dilation is accounted for in the fracture model. The numerical result shows that the crack growth behavior, i.e. the mode of crack propagation changes from mode I to mode II as the depth increases. Under a typical tectonic stress condition, the crack growth mode is dominated by the mode I component above 4-5 km depth, whereas the influence of mode II component increases with increasing the depth. This result may suggest that the current target of supercritical geothermal reservoirs may be formed mainly under the mode I fracture.
Microcrack Generation and Microcrack Healing Behaviour in Granite under Supercritical Water Conditions Peer-reviewed

K. Tanifuji, Y. Fujii, T. Takashima, T. Takahashi, C. Stafford, T. Hashida

Proc. of Workshop on Potential Thermal Extraction From Deep-Seated Rock Masses, (October 25-26, 2001, Sendai, Japan)　1-10　2001
Numerical Simulation of Geothermal Reservoir Formation Induced by Hydraulic Fracturing at Great Depth Peer-reviewed

K. Sato, M. Itaoka, T. Hashida

Proc. of Workshop on Potential Thermal Extraction From Deep-Seated Rock Masses, (October 25-26, 2001, Sendai, Japan)　21-26　2001
A New 3-D Stochastic Model for HDR Geothermal Reservoir in Fractured Crystalline Rock Peer-reviewed

Z. Jing, J. Willis-Richards, K. Watanabe, T. Hashida

Proceedings of International Conference 4th HDR Forum, (Strasbourg, September 28-30, 1998), Edited by R. Baria, J. Baumgartner, A. Gerard and R. Jung　323-330　2001
Fracture Mechanics Study on Formation Process of Artificial Geothermal Reservoirs under Supercritical Water Conditions Peer-reviewed

Toshiyuki Hashida, T. Takahashi, Kazushi Sato, Katsuto Nakatsuka

Proceedings of International Conference 4th HDR Forum, (Strasbourg, September 28-30, 1998), Edited by R. Baria, J. Baumgartner, A. Gerard and R. Jung　419-425　2001
Experimental study of rock/water/CO2 interaction at temperatures of 100-350 degrees C Peer-reviewed

Y Suto, L Liu, T Hashida, N Tsuchiya, N Yamasaki

WATER-ROCK INTERACTION, VOLS 1 AND 2　1　341-344　2001
Application of a mechanochemical method for recycling waste glass with CO2 solidification Peer-reviewed

LH Liu, T Hashida, S Teramura

MECHANICS AND MATERIAL ENGINEERING FOR SCIENCE AND EXPERIMENTS　209-213　2001
Development of design methodology for deep-seated geothermal energy extraction systems Peer-reviewed

T Hashida, A Shimizu, T Takahashi, K Tanifuji

MECHANICS AND MATERIAL ENGINEERING FOR SCIENCE AND EXPERIMENTS　453-456　2001
Low temperature synthesis of hydroxyapatite ceramics from octacalcium phosphate by hydrothermal hot pressing Peer-reviewed

JG Li, T Onoki, LH Liu, A Nakahira, T Hashida

MECHANICS AND MATERIAL ENGINEERING FOR SCIENCE AND EXPERIMENTS　214-217　2001
Thermal failure of thermal barrier coating for gas turbine blades by laser heating method Peer-reviewed

YC Zhou, T Hashida

MECHANICS AND MATERIAL ENGINEERING FOR SCIENCE AND EXPERIMENTS　396-399　2001
Development of a CO2 solidification method for recycling autoclaved lightweight concrete waste Peer-reviewed

L Liu, J Ha, T Hashida, S Teramura

JOURNAL OF MATERIALS SCIENCE LETTERS　20　(19)　1791-1794　2001

DOI： 10.1023/A:1012591318077 　

ISSN： 0261-8028
Guest editorial Peer-reviewed

Toshiyuki Hashida, Takeshi Mitsuda

Journal of Materials in Civil Engineering　12　(4)　281　2000/11/01

DOI： 10.1061/(ASCE)0899-1561(2000)12:4(281) 　

ISSN： 0899-1561
A three-dimensional stochastic rock mechanics model of engineered geothermal systems in fractured crystalline rock Peer-reviewed

Z Jing, J Willis-Richards, K Watanabe, T Hashida

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH　105　(B10)　23663-23679　2000/10

DOI： 10.1029/2000JB900202 　

ISSN： 2169-9313

eISSN： 2169-9356
Development of a multiple linear regression model to estimate the ductile-brittle transition temperature of ferritic low-alloy steels based on the relationship between small punch and Charpy V-notch tests Peer-reviewed

ML Saucedo-Munoz, T Matsushita, T Hashida, T Shoji, H Takahashi

JOURNAL OF TESTING AND EVALUATION　28　(5)　352-358　2000/09

ISSN： 0090-3973

eISSN： 1945-7553
THE STRUCTURE AND ENERGY POTENTIAL OF SUPERCRITICAL GEOTHERMAL RESERVOIRS Peer-reviewed

Hashida T, Tsuchiya N, Bignall G, Nakatsuka N

Abstract of iavcei GENERAL ASSEMBLY 2000　283　2000/07
Development of small punch tests for creep property measurement of tungsten-alloyed 9%Cr ferritic steels Peer-reviewed

S Komazai, T Hashida, T Shoji, K Suzuki

JOURNAL OF TESTING AND EVALUATION　28　(4)　249-256　2000/07

DOI： 10.1520/JTE12102J 　

ISSN： 0090-3973
Review of Progress Toward the Development of Geothermal Reactor Peer-reviewed

T. Hashida, K. Nakatsuka

Proceedings of Joint Sixth International Symposium on Hydrothermal Reactions and Fourth International Conference on Solvo-Thermal Reactions, (July 25-28, 2000, Kochi, Japan)　268-273　2000/07
Numerical Modelling of Water/Rock Chemical Interaction in HDR/HWR Geothermal Reservoirs Peer-reviewed

Z. Jing, T. Hashida, K. Watanabe

Proceedings of Joint Sixth International Symposium on Hydrothermal Reactions and Fourth International Conference on Solvo-Thermal Reactions, (July 25-28, 2000, Kochi, Japan)　290-293　2000/07
Water-Rock Interaction in a Flow-Through Experimental System, with Application to the Development of Deep-Seated Geothermal Resources Peer-reviewed

G. Bignall, N. Tsuchiya, N. Hirano, T. Hashida

Proceedings of Joint Sixth International Symposium on Hydrothermal Reactions and Fourth International Conference on Solvo-Thermal Reactions, (July 25-28, 2000, Kochi, Japan)　294-297　2000/07
Low-Temperature Solidifying Method of Fibrous Composite and Its Application Peer-reviewed

K. Sato, Y. Ohtani, T. Hashida, T. Shoji, N. Yamasaki

Proceedings of Joint Sixth International Symposium on Hydrothermal Reactions and Fourth International Conference on Solvo-Thermal Reactions, (July 25-28, 2000, Kochi, Japan)　415-418　2000/07
Measurement of CO₂ Solubility in Simulated Underground Water at Depth for the Carbon Dioxide Sequestration Peer-reviewed

Yuko Suto, Lihiu Liu, Toshiyuki Hashida, Nakamichi Yamasaki

Proceedings of Joint Sixth International Symposium on Hydrothermal Reactions and Fourth International Conference on Solvo-Thermal Reactions, (July 25-28, 2000, Kochi, Japan)　309-312　2000/07
New Method for Bonding Hydroxyapatite and Metal by Hydrothermal Hot-pressing Peer-reviewed

T. Onoki, K. Hosoi, T. Hashida

Proceedings of Joint Sixth International Symposium on Hydrothermal Reactions and Fourth International Conference on Solvo-Thermal Reactions, (July 25-28, 2000, Kochi, Japan)　549-552　2000/07
Waste Treatment Process by Solidifying Cementitious Materials Using Hydrothermal Hot-pressing Peer-reviewed

Y. Matsumoto, T. Kamakura, N. Yamasaki, T. Hashida

Proceedings of Joint Sixth International Symposium on Hydrothermal Reactions and Fourth International Conference on Solvo-Thermal Reactions, (July 25-28, 2000, Kochi, Japan)　215-218　2000/07
Investigation of Heat Extraction from Supercritical Geothermal Reservoirs Peer-reviewed

Toshiyuki Hashida, Kazuo Hayashi, Hiroaki Niitsuma, Koji Matsuki, Noriyoshi Tsuchiya, Katsuto Nakatsuka

Proc. of World Geothermal Congress 2000, (May 28-June 10, 2000, Kyushu-Tohoku, Japan)　3725-3730　2000
Development of Numerical Simulation Code for Hydraulic Fracturing Using Embedded Crack Element Peer-reviewed

Kazushi Sato, Toshiyuki Hashida

Proc. of World Geothermal Congress 2000, (May 28-June 10, 2000, Kyushu-Tohoku, Japan)　3865-3870　2000
Numerical Study on Heat Extraction from Supercritical Geothermal Reservoir Peer-reviewed

Kimio Watanabe, Yuichi Niibori, Toshiyuki Hashida

Proc. of World Geothermal Congress 2000, (May 28-June 10, 2000, Kyushu-Tohoku, Japan)　3957-3961　2000
Effects of CO₂ on Water/Rock Chemical Interactions in Geothermal Reservoir Environment Peer-reviewed

Yuko Suto, Yuki Yamasaki, Toshiyuki Hashida, Nakamichi Yamasaki

Proc. of World Geothermal Congress 2000, (May 28-June 10, 2000, Kyushu-Tohoku, Japan)　3901-3906　2000
Laboratory Simulation of Granite-Fluid Interactions up to Supercritical Conditions Peer-reviewed

Greg Bignall, Nakamichi Yamasaki, Toshiyuki Hashida

Proc. of World Geothermal Congress 2000, (May 28-June 10, 2000, Kyushu-Tohoku, Japan)　3671-3676　2000
A Newly Developed Flow-Reactor Autoclave, with pH Measurement System, for Laboratory Simulation of Chemical Interaction Processes Peer-reviewed

Greg Bignall, Nakamichi Yamasaki, Toshiyuki Hashida

Proc. of World Geothermal Congress 2000, (May 28-June 10, 2000, Kyushu-Tohoku, Japan)　3665-3670　2000
New Development of 3-D Stochastic Model for Design of HDR/HWR Geothermal Reservoir System Peer-reviewed

Ayumu Shimizu, Toshiyuki Hashida, Kimio Watanabe, Jonathan Willis-Richards

Proc. of World Geothermal Congress 2000, (May 28-June 10, 2000, Kyushu-Tohoku, Japan)　3877-3882　2000
Combined Effects of Temperature Gradient and Oxidation on Thermal Barrier Coating Failure Peer-reviewed

Y. C. Zhou, T. Hashida

Life Assessment of Hot Section Gas Turbine Components (Proceedings of a Conference Held at Heriot Watt University, Edinburgh, UK, 5-7 October 1999), Edited by R. Townsend et al.　155-172　2000
The thermal-mechanical coupled failure mechanism of thermal barrier ceramic coating Invited Peer-reviewed

Y. C. Zhou, T. Hashida

Mechanics 2000 , edited by Y. L. Bai and W. Yang, Meteorological Press　600-601　2000
Attenuation behaviour of tuffaceous sandstone and granite during microfracturing Peer-reviewed

AM Wulff, T Hashida, K Watanabe, H Takahashi

GEOPHYSICAL JOURNAL INTERNATIONAL　139　(2)　395-409　1999/11

DOI： 10.1046/j.1365-246X.1999.00943.x 　

ISSN： 0956-540X

eISSN： 1365-246X
Stress and rock mechanics issues of relevance to HDR/HWR engineered geothermal systems: review of developments during the past 15 years Peer-reviewed

KF Evans, FH Cornet, T Hashida, K Hayashi, T Ito, K Matsuki, T Wallroth

GEOTHERMICS　28　(4-5)　455-474　1999/08

DOI： 10.1016/S0375-6505(99)00023-1 　

ISSN： 0375-6505
The Influence of Weld on the Tensile Failuire Types of A Structural Steel Peer-reviewed

Mamoru Nagao, Masao Kinefuchi, Atsumichi Kushibe, Takatoshi Ogawa, Hirofumi Kaneko, Shi Cheng Liu, Toshiyuki Hashida

J. Struct. Constr. Eng., AIJ　517　(517)　17-22　1999/03
Publisher: Architectural Institute of Japan
DOI： 10.3130/aijs.64.17_1 　

ISSN： 1340-4202

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We investigated the failure types of 50mm thick structural steel plates (SN490) including a weld bead line by conducting tensile tests. The testing temperature, -40℃, was selected in order to simulate the high strain rate. When the weld line made a right angle with the tensile axis, a usual ductile fracture occurred. On the other hand, when a bead line was parallel to the tension axis, brittle fracture occurred. Having a slit in the backing strip in the latter condition, the fracture stress was reduced to a yield strength level. The brittle fracture stress in the slit specimen was estimated by a simple fracture mechanics approach based on the measured fracture toughness K_<IC> (50MPa m^<1/2>), the initial crack size (6.4mm) as determined from SEM observation, and the estimate of residual stress along the weld line.
Relationship Between Fractal Dimension of Multiple Microcracks and Fracture Energy in Rocks Peer-reviewed

Kazushi Sato, Toshiyuki Hashida, Hideaki Takahashi, Toru Takahashi

Geothermal Science and Technology　6　1-23　1999
Analysis of Long-term Performance of Hot Dry Rock Geothermal Energy Extraction Systems Based on Fractal Fracture Network Model Peer-reviewed

Kimio Watanabe, Nobutsugu Chigira, Jonathan Willis-Richards, Toshiyuki Hashida, Hideaki Takahashi

Geothermal Science and Technology　6　223-243　1999
Recycling of Glass and Concrete Wastes by Carbonation Method Peer-reviewed

Toshiyuki Hashida, Toshiyuki Murohashi, Kimitoshi Karino, Satoshi Teramura

Proceedings of the Fouth International Conference on Ecomaterials, (November 10th-12th , 1999, Gifu, Japan)　241-244　1999
Laboratory Experiment and Numerical Simulations on Formation Process of Supercritical Goethermal Reservoir

Toshiyuki Hashida

Proceedings of International Workshop on Rock Fracture and Water-Rock Interactions at High Temperatures, (November 9th, 1998, Sendai, Japan)　1-6　1998/11
A study on fractography in the low-temperature brittle fracture of an 18Cr-18Mn-0.7N austenitic steel Peer-reviewed

SC Liu, T Hashida, H Takahashi, H Kuwano, Y Hamaguchi

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　29　(3)　791-798　1998/03

ISSN： 1073-5623
New Synthesis Technique for Making Hydroxyapatite Ceramics Using Hydrothermal Hot-Pressing Peer-reviewed

T. Korenaga, T. Hashida, H. Takahashi, N. Yamasaki, K. Hosoi

Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu　7　1405-1407　1998

DOI： 10.4131/jshpreview.7.1405 　

ISSN： 1348-1940 0917-639X
Application of Carbon Dioxide for Drying Method of Woods Peer-reviewed

Toshio Kono, Hayato Shinohara, Nakamich Yamasaki, Toshiyuki Hashida, Testuo Shoji

Waste & Resource　35　5-13　1997/10
Development of high strength calcium aluminate-phosphate cement by hydrothermal hot-pressing Peer-reviewed

K Sato, T Hashida, H Takahashi, N Yamasaki

JOURNAL OF MATERIALS SCIENCE LETTERS　16　(17)　1464-1468　1997/09

DOI： 10.1023/A:1018546318785 　

ISSN： 0261-8028
Development of environmentally-friendly processing methods for cementitious material

Jechang Ha, Toshiyuki Hashida

Proceedings of International Symposium on Solvothermal & Hydrothermal Processes, (September 1-3, 1997, Takamatsu, Kagawa, Japan)　54-55　1997/09
Solidification method for phosphate bonded alumina cement by hydrothermal hot-pressing Peer-reviewed

K Satoh, T Hashida, H Takahashi, N Yamasaki

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN　105　(5)　424-427　1997/05

DOI： 10.2109/jcersj.105.424 　

ISSN： 1882-0743

eISSN： 1348-6535
Evaluation of Microscopic Strength Distribution in Rock Using Acoustic Emission Measurements Peer-reviewed

Toru Takahashi, Kazushi Sato, Toshiyuki Hashida, Hideaki Takahashi

Trans. JSME(A)　63　(609)　908-913　1997/05
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.63.908 　

ISSN： 0387-5008

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A method for determining microscopic strength distribution in rocks using an acoustic emission (AE) technique is proposed. The principle of the method is based on a statistical model for fracture analysis of quasi-brittle materials which has been developed by McClintock et al. [Int. J. Fract., 15 2 (1979), 107-118]. The statistical model assumes an inhomogeneous strength distribution of the material which is dictated by the fracture probability with Weibull distribution. Firstly, the principle of the statistical method is verfied by performing numerical simulations using a network model. Secondly, the method is applied to experimental results of uniaxial tension tests and AE measurements conducted on granite and marble. It is demonstrated that the numerical and experimental results support the validity of the proposed method for determining the microscopic strength distribution in rocks.
Strengthening of hydrothermal hot-pressed concrete waste by the addition of slag Peer-reviewed

K Sato, T Hashida, H Takhashi, N Yamasaki

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN　105　(3)　262-264　1997/03

DOI： 10.2109/jcersj.105.262 　

ISSN： 1882-0743

eISSN： 1348-6535
Solidification behaviour of calcium carbonate via aragonite-calcite wet transformation with hydrothermal hot pressing Peer-reviewed

K Hosoi, T Hashida, H Takahashi, N Yamasaki, T Korenaga

JOURNAL OF MATERIALS SCIENCE LETTERS　16　(5)　382-385　1997/03

DOI： 10.1023/A:1018506714049 　

ISSN： 0261-8028
Improving the Penetrability and Dryability of Sugi from Cut End by Air Pressure and Vacuum Process under Hydrothermal Condition Peer-reviewed

Hayato Shinohara, Toshio Kono, Nakamich Yamasaki, Hideaki Takahashi, Toshiyuki Hashida, Testuo Shoji

Mokuzai Kogyo　52　(2)　61-66　1997/02
Publisher:
ISSN： 0026-8917
Solidification method for phosphate bonded alumina cement by hydrothermal hot-pressing Peer-reviewed

Kazuhiko Satoh, Toshiyuki Hashida, Hideaki Takahashi, Nakamichi Yamasaki

Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan　105　(1221)　424-427　1997
Publisher: Ceramic Soc of Japan
DOI： 10.2109/jcersj.105.424 　

ISSN： 0914-5400
Strengthening of hydrothermal hot-pressed concrete waste by the addition of slag Peer-reviewed

Kazuhiko Sato, Toshiyuki Hashida, Hideaki Takahashi, Nakamichi Yamasaki

Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan　105　(1219)　262-264　1997
Publisher: Ceramic Soc of Japan
DOI： 10.2109/jcersj.105.262 　

ISSN： 0914-5400
Improving the Penetrability and Dryability of Sugi from Cut End by Air Pressure and Vacuum Process under Hydrothermal Condition Peer-reviewed

Hayato Shinohara, Toshio Kono, Nakamich Yamasaki, Toshiyuki Hashida, Testuo Shoji

Waste & Resource　35　14-22　1997
Cryogenic Fracture Characteristics of Austenitic Stainless Steel JN1 Welded Joint and Heat Treated Materials by Means of Small Punch Tecting Method Peer-reviewed

I1-Hyun Kwon, Shi-Cheng, Liu, Maribel L. Saucedo, Toshiyuki Hashida, Hideaki Takahashi

Trans. JSME(A)　63　(605)　61-67　1997/01
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.63.61 　

ISSN： 0387-5008

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Fracture characteristics of a TIG welded joint and heat treated materials of JNI, which is an austenitic stainless steel recently developed for use as a cryogenic structural material, were evaluated by the small punch (SP) testing method using miniaturized specimens at 77K and 4K. The area under the load displacement curve up to the maximum load was defined as the SP energy to evaluate the fracture characteristics of the materials in SP tests. Fracture surfaces were also observed using a scanning clectron microscope. Solution-treated JN1 steel showed ductile fracture behavior with a high SP energy value even at 4K, and serrations were observed in the load displacement curve at 4K, In the weld metal and fusion line specimens of the TIG welded joint, serrations also occured at 4K, but the fusion line specimens showed lower SP energy values than weld metal and solutiontremed JN1 steel at 77K and 4K. In addition, the fusion line specimens showed pop in behavior at 4K, that is, cracks approximately 0.1-1mm long were induced by pop-in in the vicinity of the fusion line at the early stage of loading. JN1 materials heat treated under the conditions of 650°C 5h and 700°C In showed similar fracture characteristics to those of the fusion line specimens at 77 K and 4 K except for the cracks induced by pop-in. With increasing temperature and time of heat treatment, SP energy decreased significantly, and the fracture surface showed a transition from ductile dimple to brittle intergranular cracking. It is shown that the SP testing method is useful for evaluating the fracture behaviors of microscopic regions such as the fusion lines of welds at cryogenic temperatures.
Development of a Cut End Air Pressurization under Hydrothermal Conditions and Penetration Characteristics Peer-reviewed

Hayato SHINOHRA, Toshio KONO, Nakamichi YAMASAKI, Hideaki TAKAHASHI, Toshiyuki HASHIDA, Tetsuo SHOJI

Proc. of The Second International Conference on Solvothermal Reactions,Japan　18-20　1996/12
Development of a CO₂-Solidification Method for Recycling Concrete Wastes,Materials for the New Millennium Peer-reviewed

Toshiyuki Hashida, Satoshi Teramura, J.C. Ha, Hideaki Takahashi

Proceedings of the Fourth Materials Engineering Conference ,Washington　674-683　1996/11
Low Temperature Solidification of CaCO₃ using Hydrothermal Hot-Pressing Peer-reviewed

Kazuyuki Hosoi, Toshiyuki Hashida, Hideaki Takahashi, Nakamichi Yamasaki, Takashi Korenaga

Proceedings of the Fourth Materials Engineering Conference ,Washington　694-703　1996/11
Development of a Solidification Method for Pulverized Concrete Waste by Hydrothermal Hot-pressing and Fiber Reinforcement Peer-reviewed

Kazuhiko Sato, Toshiyuki Hashida, Hideaki Takahashi, Nakamichi Yamasaki

Proceedings of the Fourth Materials Engineering Conference, Washington　684-693　1996/11
Strengthening and Toughening in Hydrothermal Hot-Pressed CaCO₃ Composite Peer-reviewed

K. Hosoi, T. Korenaga, T. Hashida, H. Takahashi, N. Yamasaki

Proc. of The Second International Conference on Solvothermal Reactions, (December 18-20, 1996, Takamatsu, Kagawa, Japan)　85-88　1996/11
Solidification Method for Calcium Aluminate-Phosphate Cement by Hydrothermal Hot-pressing and Fiber Reinforcement Peer-reviewed

K. Sato, T. Hashida, H. Takahashi, N.Yamasaki

Proc. of The Second International Conference on Solvothermal Reactions, (December 18-20, 1996, Takamatsu, Kagawa, Japan)　89-92　1996/11
Development of Solvothermal Methods for Recycling Concrete Wastes Peer-reviewed

Toshiyuki Hashida, Hideaki Takahashi

Proc. of The Second International Conference on Solvothermal Reactions, (December 18-20, 1996, Takamatsu, Kagawa, Japan)　152-155　1996/11
New processing technique for hydroxyapatite ceramics by the hydrothermal hot-pressing method Peer-reviewed

K Hosoi, T Hashida, H Takahashi, N Yamasaki, T Korenaga

JOURNAL OF THE AMERICAN CERAMIC SOCIETY　79　(10)　2771-2774　1996/10

ISSN： 0002-7820
A NOVEL METHOD FOR HEALING FATIGUE CRACK DAMAGE IN SUS 304 STAINLESS STEEL BY MEANS OF SPARK PLASMA PROCESSING Peer-reviewed

Shi Cheng LIU, Masahiro SAITO, Toshiyuki HASHIDA, Hideaki TAKAHASHI

Proceedings of Asian Pacific Conference for Fracture and Strength '96,Korea　813-817　1996/07
Mechanical Behavior of Ceramics Prepared by Means of Spark Plasma Sintering Method Peer-reviewed

J.C.Rendon-Angeles, T.Nishikawa, M.Saito, T.Hashida, H.Takahashi

Proceddings of Asian Pacific Conference for Fracture and Strength '96,Korea　693-697　1996/07
Study on Fractal Characteristics of Acoustic Emission and Crack Propagation in Rocks Peer-reviewed

Kazushi SATO, Naoto HIMURA, Toshiyuki HASHIDA, Hideaki TAKAHASHI

Trans. JSME(A)　62　(598)　1333-1339　1996/06
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.62.1333 　

ISSN： 0387-5008

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In this paper, the fractal nature of crack propagation in rocks is demonstrated by means of acoustic emission (AE) method. AE behavior is monitored during fracture toughness tests conducted on compact tension specimens of three types of rocks. It is shown that the microcrack fracture process zone proceeds the macroscopic crack extension, resulting in nonlinear fracture behavior. Iidate granite, Tohoku marble and Akiyoshi limestone were used. In Iidate granite, the fracture process zone grows in narrow region. Tohoku marble shows that the fracture process zone consists of distributed microcracks surrounding the marcroscopic crack. In Akiyoshi limestone which is preheat treated, extensive crack branching is observed. The AE behavior is characterized by a fractal dimension b which is the slope of the log-log frequency and AE energy distribution. The trend in variation of b-value is shown to correspond to the crack propagation bahavior. In addition, it is found that the fluctuation of b-value can also be characterized by fractal. This observation implies that the self-similarity lies in the rock fracture process.
Low temperature solidification of calcium carbonate through vaterite-calcite wet transformation Peer-reviewed

K Hosoi, T Hashida, H Takahashi, N Yamasaki, T Korenaga

JOURNAL OF MATERIALS SCIENCE LETTERS　15　(9)　812-814　1996/05

DOI： 10.1007/BF00274614 　

ISSN： 0261-8028
Toughening of Short Fiber Reinforced Xonotlite Composites by Multiple Cracking Peer-reviewed

Toshiyuki Hashida, Masanori Tsutamori, Hideaki Takahashi, Chiharu Wada

Inorganic Materials　3　(262)　203-211　1996

DOI： 10.11451/mukimate1994.3.203 　
Evaluation of Mechanical Properties of Plasma Sprayed Zirconia/NiCrAlY Coating System by Means of Small Punch Testing Method Peer-reviewed

Yon-Jig Kim, Toshiyuki Hashida, Hideaki Takahashi, Kouji Fujii, Motoi Kanazawa

Journal of Japan Thermal Spraying Society　33　(2)　1-8　1996
Publisher:
ISSN： 0916-6076
Study on Microscopic Strength Distribution and Growth of Fracture Process Zone in Rock Peer-reviewed

Kazushi Sato, Tadashi Tobina, Naoto Himura, Toshiyuki Hashida, Hideaki Takahashi

Trans. JSME(A)　62　(603)　2547-2552　1996
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.62.2547 　

ISSN： 0387-5008

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In this paper, the growth behavior of fracture process zone in rock is examined from the viewpoint of the microscopic strength distribution. Numerical calculations were performed using a network model in order to analyze the microcracking behavior which is accompanied with the crack extension. CT specimen configuration was used in the network model analysis. The network model is composed of brittle stick elements, and microscopic inhomogeneity is represented by the strength distribution of the stick elements. The calculation results show that the microcracking behavior depends on the microscopic strength distribution. The geometrical characteristic of the fracture process zone is observed to change from a distributed microcrack zone type to a localized zone type, depending on the microscopic strength distribution.
Application of Acoustic Emission Technique for Optimization of Wood Drying Method by Use of Carbon Dioxide Peer-reviewed

Toshio KONO, Hayato SHINOHARA, Nakamichi YAMASAKI, Hideaki TAKAHASHI, Toshiyuki HASHIDA, Kinji TAMAKAWA, Tetsuo SHOJI

Progress in Acoustic Emission VIII,JSNDI　327-332　1996
Tensile behavior of cement-based composites with random discontinuous steel fibers Peer-reviewed

VC Li, HC Wu, M Maalej, DK Mishra, T Hashida

JOURNAL OF THE AMERICAN CERAMIC SOCIETY　79　(1)　74-78　1996/01

DOI： 10.1111/j.1151-2916.1996.tb07882.x 　

ISSN： 0002-7820
Study on Evaluation of the Solidified Granitic Rock by Hydrothermal Hot Press Method and AE Characteristics Peer-reviewed

Na Eui Gyun, Toshiyuki Hashida

Korean Journal of Materials Research　6　(3)　145-252　1996
Determination of Tension-Softening Curve and Fracture Behavior Evaluation Crack Tip Toughness Peer-reviewed

Kazushi Sato, Toshiyuki Hashida, Hideaki Takahashi

Trans. JSME(A)　62　(603)　2541-2546　1996

DOI： 10.1299/kikaia.62.2541 　
The Effect of Water/Rock Interaction on the Permeability of HDR Geothermal Reservoir Peer-reviewed

Z.Jing, J.Willis-Richards, K.Watanabe, T.Hashida

Proc. of The Second International Conference on Solvothermal Reactions,Japan　169-172　1996
Hydrothermal solidification of calcium carbonate and strength evaluation of solidified body Peer-reviewed

KAZUYUKI HOSOI, TAKASHI KORENAGA, TOSHIYUKI HASHIDA, HIDEAKI TAKAHASHI, NAKAMICH YAMASAKI

Proc. of Workshop on Solvothermal & Hydrothermal Reactions ,Japan　127-130　1996/01
Hydrothermal Hotpressing for Composites Peer-reviewed

Hideaki Takahashi, Toshiyuki Hashida

Proc. of Workshop on Solvothermal & Hydropthermal Reactions ,Japan　62-66　1996/01
Effect of fiber volume fraction on the off-crack-plane fracture energy in strain-hardening engineered cementitious composites Peer-reviewed

M Maalej, T Hashida, VC Li

JOURNAL OF THE AMERICAN CERAMIC SOCIETY　78　(12)　3369-3375　1995/12

DOI： 10.1111/j.1151-2916.1995.tb07979.x 　

ISSN： 0002-7820

eISSN： 1551-2916
EFFECT OF FIBER RUPTURE ON TENSILE PROPERTIES OF SHORT-FIBER COMPOSITES Peer-reviewed

M MAALEJ, VC LI, T HASHIDA

JOURNAL OF ENGINEERING MECHANICS-ASCE　121　(8)　903-913　1995/08

DOI： 10.1061/(ASCE)0733-9399(1995)121:8(903) 　

ISSN： 0733-9399
STRENGTHENING OF HYDROTHERMAL HOT-PRESSED CONCRETE WASTES BY THE ADDITION OF FRESH CEMENT Peer-reviewed

Y NAKANE, T HASHIDA, H TAKAHASHI, N YAMASAKI

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN　103　(5)　511-514　1995/05

DOI： 10.2109/jcersj.103.511 　

ISSN： 1882-0743

eISSN： 1348-6535
Acoustic Emission Study of Process Zone Growth in Granite and Tension-Softening Model Peer-reviewed

Kazushi Sato, Toshiyuki Hashida, Hideaki Takahashi

Rock and Soil Mechanics　19　81-95　1995
Publisher:
An Accelerated Testing Method of ZrO2-Based FGM Coating for Gas Turbine Blades Peer-reviewed

C. Y. Jian, Toshiyuki Hashida, Hideaki Takahashi, Nobuyuki Shimoda, Masahiro Saito

Proc. 3rd Int. Symp. Structural and Functional Gradient Materials　419-424　1995
THERMAL-SHOCK AND FATIGUE RESISTANCE EVALUATION OF FUNCTIONALLY GRADED COATING FOR GAS-TURBINE BLADES BY LASER-HEATING METHOD Peer-reviewed

CY JIAN, T HASHIDA, H TAKAHASHI, M SAITO

COMPOSITES ENGINEERING　5　(7)　879-889　1995

ISSN： 0961-9526
Development of Short-Fiber Reinforced Cementitious Composites by CO₂-Hardening Method for Recycling Concrete Wastes Peer-reviewed

J. C. Ha, K. Hojo, T. Hashida, H. Takahashi, S. Teramura

Proc. 4th Japan International SAMPE Symp.　1413-1418　1995
Development of Thermal Shock and Fatigue Tests of Ceramic Coatings for Gas Turbine Blades by AE Technique Peer-reviewed

C. Y. Jian, Tatsuya Shimizu, Toshiyuki Hashida, Hideaki Takahashi, Masahiro Saito

Journal of Acoustic Emission　13　(3-4)　68-74　1995
Future Target for Geothermal Development: Fractal Fracture Mechanics and Its Application to Conceptual HDR Design

H. Takahashi, K. Watanabe, T. Hashida

Proc. 20th Workshop on Geothermal Reservoir Engineering　20　167-174　1995
Development of Thermal Shock and Fatigue Tests of Ceramic Coatings for Gas Turbine Blades by AE Technique

C. Y. Jian, T. Shimizu, T. Hashida, H. Takahashi, M. Saito

Proc. of the 12th Int. Acoustic Emission Symposium　12　369-374　1994/10
Evaluation of Fracture Toughness and Micro-Fracture Mechanism of Porous Glass Composite by Using Acoustic Emission

H. D. Jeong, Y. G. Kweon, T. Hashida, H. Takahashi, S. Ohmi

Proc. of the 12th Int. Acoustic Emission Symposium　12　451-456　1994/10
A Study on Thermal Resistanve Evaluation of FGM by AE Method

J. Lim, J. Song, H. Takahashi, T. Hashida, K. Fujii, M. Kanazawa

Proc. of the 12th Int. Acoustic Emission Symposium　12　217-223　1994/10
Thermal Fracture Evaluation of Foam Glass Panels by Lamp/AE Method

S. Ohmi, M. Ohgoshi, T. Hashida, H. Takahashi

Proc. of the 12th Int. Acoustic Emission Symposium　12　277-281　1994/10
Numerical Analysis of the J-Based Fracture Testing Technique for Brittle Matrix Composites

K. Sato, T. Hashida, V. C. Li, H. Takahashi

Proc. Int. Symp. on Brittle Matrix Composites　209-218　1994/09
NEW DEVELOPMENT OF THE J-BASED FRACTURE TESTING TECHNIQUE FOR CERAMIC-MATRIX COMPOSITES Peer-reviewed

T HASHIDA, VC LI, H TAKAHASHI

JOURNAL OF THE AMERICAN CERAMIC SOCIETY　77　(6)　1553-1561　1994/06

DOI： 10.1111/j.1151-2916.1994.tb09756.x 　

ISSN： 0002-7820
EXPERIMENTAL-DETERMINATION OF THE STRESS-CRACK OPENING RELATION IN FIBER CEMENTITIOUS COMPOSITES WITH A CRACK-TIP SINGULARITY Peer-reviewed

VC LI, M MAALEJ, T HASHIDA

JOURNAL OF MATERIALS SCIENCE　29　(10)　2719-2724　1994/05

ISSN： 0022-2461
Development of solidification technique for recycle of concrete wastes by hydrothermal hot-pressing and its mechanical property

Yuji Nakane, Kazushi Sato, Hideaki Takahashi, Nakamichi Yamasaki, Toshiyuki Hashida

Journal of the Ceramic Society of Japan. International ed.　102　(4)　408-410　1994/04
Publisher: Fuji Marketing Research Co Ltd
ISSN： 0912-9200
DEVELOPMENT OF SOLIDIFICATION TECHNIQUE FOR RECYCLE OF CONCRETE WASTES BY HYDROTHERMAL HOT-PRESSING AND ITS MECHANICAL PROPERTY Peer-reviewed

Y NAKANE, K SATO, H TAKAHASHI, N YAMASAKI, T HASHIDA

NIPPON SERAMIKKUSU KYOKAI GAKUJUTSU RONBUNSHI-JOURNAL OF THE CERAMIC SOCIETY OF JAPAN　102　(4)　405-407　1994/04

DOI： 10.2109/jcersj.102.405 　

ISSN： 0914-5400
Thermal Stress and Thermal Shock Resistance Peer-reviewed

H. Takahashi, T. Hashida

Bulletin of the Ceramic Society of Japan　29　(7)　603-610　1994
BURNER HEATING METHOD FOR DETERMINING THERMAL SHOCK RESISTANCE OF CERAMIC COATINGS FOR GAS TURBINE ROTOR BLADES Peer-reviewed

T HASHIDA, H TAKAHASHI, T ISHIKAWA, K TAKAHATA, A KAWASAKI, R WATANABE, K FUJII, M KANAZAWA

ADVANCED MATERIALS '93, III - A & B　16　(A & B)　1291-1294　1994
OXIDATION THERMAL SHOCK FRACTURE EVALUATION PROCEDURE BY PLASMA-ARC HEATING FOR FUNCTIONALLY GRADIENT MATERIALS Peer-reviewed

H TAKAHASHI, T HASHIDA, D OKUKAWA, M SASAKI, T HIRAI, K FUJII, M KANAZAWA

ADVANCED MATERIALS '93, III - A & B　16　(A & B)　1295-1298　1994
Numerical Analysis of the J-Based Fracture Testing Technique for Brittle Matrix Composites Peer-reviewed

Kazushi Sato, Toshiyuki Hashida, Victor C. Li, Hideaki Takahashi

Proc. Int. Symp. on Brittle Matrix Composites, Edited by A.M. Brandt, V.C. Li and I.H. Marshall, (Warsaw, September 13-15, 1994)　209-218　1994
ENGINEERING DUCTILE FRACTURE IN BRITTLE-MATRIX COMPOSITES Peer-reviewed

VC LI, T HASHIDA

JOURNAL OF MATERIALS SCIENCE LETTERS　12　(12)　898-901　1993/06

DOI： 10.1007/BF00455611 　

ISSN： 0261-8028
NUMERICAL-SIMULATION WITH EXPERIMENTAL-VERIFICATION OF THE FRACTURE-BEHAVIOR IN GRANITE UNDER CONFINING PRESSURES BASED ON THE TENSION-SOFTENING MODEL Peer-reviewed

T HASHIDA, H OGHIKUBO, H TAKAHASHI, T SHOJI

INTERNATIONAL JOURNAL OF FRACTURE　59　(3)　227-244　1993/02

DOI： 10.1007/BF02555185 　

ISSN： 0376-9429
FRACTURE-TOUGHNESS TESTING OF CORE-BASED SPECIMENS BY ACOUSTIC-EMISSION Peer-reviewed

T HASHIDA

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES & GEOMECHANICS ABSTRACTS　30　(1)　61-69　1993/02

DOI： 10.1016/0148-9062(93)90176-E 　

ISSN： 0148-9062
SIGNIFICANCE OF AE CRACK MONITORING IN FRACTURE-TOUGHNESS EVALUATION AND NONLINEAR ROCK FRACTURE-MECHANICS Peer-reviewed

T HASHIDA, H TAKAHASHI

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES & GEOMECHANICS ABSTRACTS　30　(1)　47-60　1993/02

DOI： 10.1016/0148-9062(93)90175-D 　

ISSN： 0148-9062
LASER AND PLASMA-ARC THERMAL SHOCK/FATIGUE FRACTURE EVALUATION PROCEDURE FOR FUNCTIONALLY GRADIENT MATERIALS Peer-reviewed

H TAKAHASHI, T ISHIKAWA, D OKUGAWA, T HASHIDA

THERMAL SHOCK AND THERMAL FATIGUE BEHAVIOR OF ADVANCED CERAMICS　241　543-554　1993
EXPERIMENTAL-DETERMINATION OF TENSION-SOFTENING RELATION IN FIBER-REINFORCED HIGH-STRENGTH MORTAR BY MEANS OF J-BASED FRACTURE TECHNIQUE Peer-reviewed

VC LI, M MAALEJ, T HASHIDA

NUMERICAL MODELS IN FRACTURE MECHANICS OF CONCRETE　55-66　1993
Significance of Crack Opening Monitoring for Determining the Growth Behavior of Hydrofractures

T. Hashida, K. Sato, H. Takahashi

Proc. of Eighteenth Workshop Geothermal Reservoir Engineering, (Stanford, Jan. 26-28, 1993)　79-84　1993/01
THE USE OF SMALL PUNCH (BULGE) TESTS TO ESTIMATE FRACTURE-STRESS IN THE LOWER SHELF REGIME Peer-reviewed

YH JOO, T HASHIDA, H TAKAHASHI, K SHIMOMURA

JOURNAL OF TESTING AND EVALUATION　20　(5)　336-342　1992/09

ISSN： 0090-3973
Measurment of Crack Opening Displacement during Hydraulic Fracturing Test and Crack Propagation Peer-reviewed

K. Sato, T. Igarashi, T. Hashida, H. Takahashi

Trans. JSME(A)　58　(552)　1519-1523　1992/08
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.58.1519 　

ISSN： 0387-5008

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The measurement of the crack opening displacement during a hydraulic fracturing test is examined to estimate the crack propagation behavior. Hydraulic fracturing tests in granite were carried out under no confining pressure in the laboratory. During the test, the borehole deformation was measured by the clip-gauge-type sensor installed on the center of the injection unit. Three sensors were used to measure the deformation of three different orientations aroulld a borehole at the same time. The pressure-displacement curve indicates the proportional relation initially, and abrupt increase in the deformation is observed at the breakdown. The elastic modulus is estimated from the initial tangent of the pressure-displacement curve. The crack opening displacement, when the fluid pressure starts to act to the fracture surface, is determined from the deformation behavior. The results of the measurements of the displacements in different orientations around the borehole indicate the direction of the crack propagation induced by the hydraulic pressure. Finally, using the measured crack opening displacement, the final crack size is estimated approximately based on the linear elastic fracture mechanics.
EFFECT OF DEFORMATION RATE ON THE SMALL PUNCH DUCTILE-BRITTLE TRANSITION BEHAVIOR IN TURBINE ROTOR STEELS Peer-reviewed

YH JOO, K SHIMOMURA, T HASHIDA, H TAKAHASHI

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN　78　(3)　485-492　1992/03

DOI： 10.2355/tetsutohagane1955.78.3_485 　

ISSN： 0021-1575
Fracture Opening/Propagation Behavior and their Significance on Pressure-Time Records during Hydraulic Fracturing Peer-reviewed

Takashi Kojima, Yasuhiko Nakacawak, Koji Matsuki, Toshiyuki Hashida

journal of the geothermal research society of japan　14　(3)　237-251　1992

DOI： 10.11367/grsj1979.14.237 　

ISSN： 1883-5775 0388-6735
Does the process zone control crack growth? Peer-reviewed

H. Ab⃩, M. Saka, S. Ohba, T. Hashida

Applied Mechanics Reviews　45　(8)　367-376　1992

DOI： 10.1115/1.3119765 　

ISSN： 0003-6900
Optimization of Discontinuous Fiber Composites Peer-reviewed

V. C. Li, M. Maalej, T. Hashida

Proc. of the Ninth Engineering Mechanics Conference,eds. by L.D.Lutes and J.Niedzwecki,America Society of Civil Engineers　1000-1003　1992
DUCTILE FRACTURE IN CEMENTITIOUS MATERIALS Peer-reviewed

VC LI, T HASHIDA

FRACTURE MECHANICS OF CONCRETE STRUCTURES /　526-535　1992
Development of a Laser Heating Method for Evaluating Thermal Shock/Fatigue Resistance of Ceramic Thermal Barrier Coating for Gas Turbin Blade Peer-reviewed

T. Hashida, T. Ishikawa, T. Tobe, H. Takahashi

Trans. JSME(A)　58　(545)　15-19　1992/01

DOI： 10.1299/kikaia.58.15 　
DETERMINATION OF DUCTILE-BRITTLE TRANSITION-TEMPERATURE (DBTT) IN DYNAMIC SMALL PUNCH TEST Peer-reviewed

YH JOO, T HASHIDA, H TAKAHASHI

JOURNAL OF TESTING AND EVALUATION　20　(1)　6-14　1992/01

ISSN： 0090-3973
Development of Dynamic Small Punch Testing Method and Prediction of the Ductile-Brittle Transition Temperature Peer-reviewed

Kazuhiro Tokitsu, Yeong-han Joo, Toshiaki Nei, Keiichi Shimomura, Toshiyuki Hashida, Hideaki Takahashi

Trans. JSME(A)　57　(544)　2911-2915　1991/12
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.57.2911 　

ISSN： 0387-5008

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A dynamic small punch (DSP) tester has been developed. DSP specimens are dynamically loaded by hitting an input bar through a striker bar which is accelerated by an air gun. The maximum speed of the striker bar is 13 m/s. Load and deflection are measured with two foil strain gages attached to the input bar and the deflection sensor, respectively. The fracture energy of the DSP test is determined from the total area under the load versus deflection curve up to the maximum load point. The ductile-brittle transition behavior of turbine rotor steels has been investigated by means of the DSP tester. The ductile-brittle transition temperature (DBTT) is determined on he basis of the variation of the DSP energy with testing temperatures. SEM observations of fractured surfaced have shown that the fracture mode transition and the DSP energy transition are consistent. The effect of strain rate on the DBTT is also examined. Based on these results, the relationship between the DBTT obtained from the DSP tests and that from the Charpy V-notch (CVN) impact tests is discussed as a function of strain rate.
Evaluation of Thermal Shock Resistance of Zirconia Coating for Gas Turbin Moving Airfoil by Laser Heating Method Peer-reviewed

T. Ishikawa, T. Tobe, T. Hashida, H. Takahashi

J. of Japan Thermal spraying Society　28　(4)　1-6　1991/12
Development of Computer-Aided Analyzing Method for Determining Fracture Toughness of Rock by Means of ISRM Methods Peer-reviewed

Shuji Tada, Toshiyuki Hashida

Trans. JSME(A)　57　(542)　2373-2377　1991/10
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.57.2373 　

ISSN： 0387-5008

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A computer-aided analyzing methed was developed for determining the fracture toughness of rock by means of ISRM methods. Fracture toughness tests were conducted on Westerly granite using the short-rod (SR) specimens, and the results were evaluated, utilizing the program. A comparison indicated that the fracture toughness value determined by the computer-aided system agrees well with that obtained from handwork. Based on the crack growth resistance curve, the fracture toughness considering its nonlinearity was successfully determined.
Effect of Compositional Distribution Profile on the Thermal Stress Mitigating Properties in Functionally Gradient Materials Peer-reviewed

S. Kato, T. Hashida, H. Takahashi

Trans. JSME(A)　57　(542)　2427-2431　1991/10
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.57.2427 　

ISSN： 0387-5008

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This paper presents some results of transient heat-transfer and thermal-stress analyses of functionally gradient materials (FGMs) subject to rapid heating. The objective of this study is to examine the effect of changing compositional distribution profiles in FGMs on the transient thermal stresses. Finite-element analysis are conducted on FGMs which posess different compositional gradients with varying mixture ratios of ZrO₂ and NiCrAIY deposited on a copper substrfte. The thermal boundary conditions used for the analysis simulate the thermal load encountered in the thrust chamber of a rocket engine. A two-dimensional, axisymmetric model is used for the numerical computations, where the outer ZrO₂ surface is subject to a heat flux and the inner copper surface temperature is kept at 0°C. It is shown that the hoop and axial stress in the FGMs are compressive, and the maximum tensile stress is the radial direction is induced at the interface between the coating layer and substrate, regardless of the different compositional profiles. It is further demonstrated that the gradient composition cas mitigate both the in-plane compressive stresses and interfacial radial tensile stress which are responsible for the cracking and delamination of the coating layers.
Development of Dynamic Small Punch Tests for Evaluating Material Degradation of Structural Steels Peer-reviewed

Yeong-han Joo, Toshiyuki Hashida, Hideaki Takahashi

SMiRT 11 Transactions, Tokyo, Japan　(G)　119-124　1991/08
Small Punch Testing Method for the Development of Functionally Gradient Materials Peer-reviewed

Seiichi Okuda, Masahiro Saito, Toshiyuki Hashida, Hideaki Takahashi

Trans. JSME(A)　57　(536)　940-945　1991/04

DOI： 10.1299/kikaia.57.940 　
Numerical Simulation of the Fracture Behavior in Granite under Confining Pressure Based on the Tension-Softening Law and Experimental Verification Peer-reviewed

H. Ogikubo, T. Hashida, T. Shoji, H. Takahashi

J.Min.Mat.Pro.Inst.Jap.　4　(107)　195-200　1991/04

DOI： 10.2473/shigentosozai.107.195 　
Evaluation of Functionally Gradient Materials (FGMs) Peer-reviewed

T. Hashida, H. Takahashi

J. of the Japan Society for Composite Materials　17　(3)　89-97　1991
Publisher: JAPAN SOCIETY FOR COMPOSITE MATERIALS
DOI： 10.6089/jscm.17.89 　

ISSN： 0385-2563
SMALL PUNCH TEST FOR CERAMIC COMPOSITES AT VERY HIGH-TEMPERATURE Peer-reviewed

M SAITO, T HASHIDA, H TAKAHASHI

FRACTURE AND STRENGTH 90　51-2　477-482　1991
FRACTURE-TOUGHNESS DETERMINATION OF CONCRETE BY USE OF BREAKOFF TESTER AND ACOUSTIC-EMISSION TECHNIQUE Peer-reviewed

T HASHIDA, H TAKAHASHI, S KOBAYASHI, Y FUKUGAWA

CEMENT AND CONCRETE RESEARCH　20　(5)　687-701　1990/09

DOI： 10.1016/0008-8846(90)90003-G 　

ISSN： 0008-8846
Evaluation of Thermal Shock Fracture of Plasma-Sprayed Thermal Barrier Coatings by Means of Laser Technique Peer-reviewed

Toshiyuki HASHIDA, Kenji WAKANA, Hideaki TAKAHASHI

Trans. JSME (A)　56　(529)　1952-1956　1990/09

DOI： 10.1299/kikaia.56.1952 　
Study on Evaluation of Thermal Shock Fracture and Thermal Stress Relaxation Property of FGM by Laser Local Heating Technique Peer-reviewed

Kazushiko Miyawaki, Toshiyuki Hashida, Hideaki Takahashi

Journal of the Japan Society of Powder and Powder Metallugy　37　(7)　957-961　1990/09
Publisher: Japan Society of Powder and Powder Metallurgy
DOI： 10.2497/jjspm.37.957 　

ISSN： 0532-8799

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This paper presents some results of transient thermal transfer and thermal stress analyses of thermal barrier coatings subject to rapid heating. The objective of this study is to develop a laser heating test for evaluating the thermal shock resistance of functionally gradient materials (FGMs). The numerical calculations are conducted on plasma-sprayed single-layer ZrO₂ (stabilized with 8% Y₂O₃), and FGM which consists of multilayer with varying mixture ratios of ZrO₂ and NiCrAIY deposited on a stainless steel substrate. The thermal barrier coatings with temperature dependent thermal and mechanical properties are heated by laser impingement. The transient thermal stress distribution is determined based on temperature profile using a finite element method. The intensity distribution within laser beam is taken into account. Based on the numerical results, the effect of the gradient composition in the FGM on the thermal shock resistance is examined. It is shown that the numerical analysis can provide a quantitative description of the enhanced thermal shock resistance of the FGM.
Study for the Evaluation of Fracture Properties on Silicon Carbide Under High Temperature by Means of an Acoustic Emission Technique Peer-reviewed

Masahiro Saito, Hideaki Takahashi, Toshiyuki Hashida, Makoto Sasaki, Toshio Hirai

Journal of the Japan Society of Powder and Powder Metallugy　37　(7)　951-956　1990/09
Publisher: Japan Society of Powder and Powder Metallurgy
DOI： 10.2497/jjspm.37.951 　

ISSN： 0532-8799

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Modified Small Punch(MSP) Test using Acoustic Emission (AE) technique was examined on silicon carbide (SiC), pre-paring by sintering or chemical vapor deposition (CVD), from room temperature to very high tenperatures. MSP testing method based on miniaturized test technique was developed to evaluate the each fracture property from once a test, and is effective especially for the material evaluation at the initial developed stage on new materials such as Functionally Gradient Materials (FGMs). From these results, the change of mechanical properties with the difference of crystal structure and fabrication method on ceramics was examined. Furthermore, micro fracture process for ceramics at high temperature environment was evaluated by AE data and the cause for the strength degradation of ceramics at very high tertperatures was also discussed. The proposed simultaneous use of MSP test and AE method could provide a great deal of the useful information on the microscopic fracture mechanism in siticon carbide ceramics at very high temperatures.
Study on Fracture Criterion for Hydraulically Induced Crack Initiation in Granite Peer-reviewed

Toshiyuki Hashida

Trans. JSME (A)　56　(528)　1730-1735　1990/08
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.56.1730 　

ISSN： 0387-5008

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Laboratory hydraulic fracturing experiments were conducted on uniaxially loaded cubic specimens of anisotropic granite to investigate the effect of anisotropy on the hydraulic fracture, and to exploit a method for predicting the breakdown pressure based on uniaxial tensile strength. Based on uniaxial tensile strength data, the results of the hydraulic fracturing experiments were analyzed with respect to the fracture angle and breakdown pressure. It was shown that the concept of a critical tensile stress at a characteristic distance, modified to account for the anisotropy of tensile strength, was able to explain the observed extension behaviours of hydraulic fractures.
DEVELOPMENT OF AN EVALUATION METHOD OF FUNCTIONALLY GRADIENT MATERIALS Peer-reviewed

H TAKAHASHI, T HASHIDA

JSME INTERNATIONAL JOURNAL SERIES I-SOLID MECHANICS STRENGTH OF MATERIALS　33　(3)　281-287　1990/07

ISSN： 0914-8809
Determination of Strain-Softening Curve and Fracture Toughness of Granite Peer-reviewed

Kazushi SATO, Hitoshi AWAYAMA, Toshiyuki HASHIDA, Hideaki TAKAHASHI

Trans. JSME (A)　56　(526)　1400-1405　1990/06
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.56.1400 　

ISSN： 0387-5008

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The J-integral-based technique for measuring strain-softening curves is applied to determine the fracture toughness of granite. The measuring method has been recently proposed by Li for concrete. This method provides information on the fracture process zone formation and can be used for fracture toughness determination in strain-softening materials. CT specimens of three different sizes, 1.5inch, 2.5inch and 6inch CT were tested to examine the specimen size effect of measured strain-softening curves. Strain-softening curves measured on 2.5inch CT specimens are shown to be in good agreement with that determined from 6 inch CT specimens, indicating the possibility of determining the valid fracture toughness value by means of the J-integral-based technique. The test results for 1.5inch CT specimens, however, yield a lower fracture toughness value than that obtained on the other specimen sizes, suggesting the need of detailed investigations on specimen size requirements for the reliable use of subsized specimens. Finally, the strain-softening curves obtained by the J-based technique are compared with existing data determined by uniaxial tensile tests on several types of granite.
Numerical Simulation of Fracture Behavior in Granite Using the Tension-Softening Model Peer-reviewed

Kazushi SATO, Toshiyuki HASHIDA, Hideaki TAKAHASHI

Trans. JSME (A)　56　(525)　1183-1188　1990/05
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.56.1183 　

ISSN： 0387-5008

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Applicability of the tension-softening model to characterize the fracture behavior of rock is examined. Tension-softening-curve measurements were made on three kinds of granite by employing Li's proposed J-integral-based technique, where the specimen-size effect on measured tension-softening curves was examined by testing CT specimens of several sizes (1.5inch∼6inchCT). The J-based measuring method is shown to be able to determine the size-independent tension-softening curve by use of laboratory-sized fracture-toughness specimens, providing that the specimen satisfies a minimum size requirement. A series of analyses of fracture-toughness tests on the granites are performed using the tension-softening law determined above, where the boundary-element method is used to simulate the overall fracture behaviors and fracture process zone growth. It is demonstrated that the load-displacement curves simulated for various sized CT and three-point bend specimens compare well with the experimental results, indicating the usefulness of the tension-softening model. These calculations are also used to propose a minimum size requirement for determining a valid tension-softening curve.
Evaluation of Fracture Strength of Functionally Gradient Materials (FGMs) - With Reference to the Development of Thermal Stress Mitigating FGMs Peer-reviewed

H. Takahashi, T. Hashida

Zairyoukagaku　2　(27)　68-74　1990
Study on Small Punch Testing Method for the Development of Functionally Gradient Materials Peer-reviewed

S. Okuda, M. Saito, T. Hashida, H. Takahashi

Trans. JSME(A)　57　(536)　940-945　1990

DOI： 10.1299/kikaia.57.940 　
Ultrasonic Monitoring of the Fracture Process Zone in Fracture Toughness Tests of Granite Peer-reviewed

Toshiyuki Hashida, Tuyoshi Ueda, Kazuhiro Date, Hideaki Takahashi, Hiroyuki Abé

Trans. JSME (A)　56　(525)　1177-1182　1990
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.56.1177 　

ISSN： 0387-5008

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A microcracking fracture process zone is known to accompany tensile macrocrack propagation in rocks. The fracture process zone with nonnegligible length is suggested to be largely responsible for the dependence of fracture mechanics data on the specimen size and geometry. In this paper, an ultrasonic timing method is employed to detect the extent of the fracture process zone (FPZ) during fracture toughness tests of granite, where the travel time of longitudinal waves propagating through fractures is monitored using 500-kHz transducers with commercially available equipment. It is demonstrated that the travel time technique can locate the tip of the FPZ continuously during fracture experiments. The growth behavior of the FPZ observed by the ultrasonic method is shown to agree with the previously published results of numerical analysis that is based on the tension-softening model. Finally, a method is developed for determining the critical J-integral value, J_C on the basis of the length of the FPZ, and the measured J_c values are compared with those obtained by Li's proposed multiple-specimen technique. It is shown that the present method permits a valid fracture-toughness value to be evaluated by use of a single fracture specimen.
Thermal-Shock Resistance of SiC-C Functionally Gradient Matrial (FGM) Prepared by Chemical Vapor Deposition Peer-reviewed

Makoto Sasaki, Yucong Wang, Akira Ookubo, Toshio Hirai, Toshiyuki Hashida, Hideaki Takahashi

Journal of the Japan Society of Powder and Powder Metallugy　37　(2)　271-274　1990
Publisher: Japan Society of Powder and Powder Metallurgy
DOI： 10.2497/jjspm.37.271 　

ISSN： 0532-8799

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Thermal stress calculated in SiC/C⋅FGM was considerably smaller than that of SiC monolith. The preparation of SiC/C⋅FGM, having the graded concentration predicted from the calculation, was tried by using CVD technique under the following conditions; a SiCl₄-CH₄-H₂ system, a deposition temperature of 1773K, total gas pressure of 1.3kPa. The film(thickness of 0.4mm) having a compositional gradient from C to SiC was obtained on a graphite substrate by changing the Si/C ratio in the gas phase during the deposition. Many small pores were observed in the range of 40-60 mol%C. SiC/C⋅FGM was not broken under cyclic high temperature heat flow conditions (heat flux=0.7MW⋅m^-2), but SiC monolith was broken under the same conditions.
Evalation of Thermal Shock Fracture of Functionally Gradient Materials Peer-reviewed

Toshiyuki Hashida, Hideaki Takahashi, Kazuhiko Miyawaki

Journal of the Japan Society of Powder and Powder Metallugy　37　(2)　307-312　1990
Publisher: Japan Society of Powder and Powder Metallurgy
DOI： 10.2497/jjspm.37.307 　

ISSN： 0532-8799

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This paper presents some results of laser heating thermal shock tests performed on plasmasprayed thermal barrier coatings. The coatings tested were single-layer ZrO₂ (stabilized with 8% Y₂O₃), and Functionally Gradient Materials (FGMs) which consisted of multi-layer with varying mixture ratios of Zr_O2 and Ni-based superalloy (NiCrAlY). FGMs are recently proposed coating materials which are aimed at mitigating thermally induced stresses in the coating. A CO₂ laser was used for the thermal shock tests, where a laser beam with a preset spot size, duration and intensity was irradiated onto the coating surfaces. Concurrently with the laser experiments acoustic-emission (AE) monitoring was made to defect the onset of the thermal shock fracture. In order to evaluate the stress state of coatings induced by the laser heating and to discuss the fracture process, numerical computations of transient thermal stresses was made using the finite element method. Based on the results, critical laser power density at the onset of coating failure was defined in order to characterize the thermal shock resistance of the coatings. It was shown that the critical power density of the FGMs is significantly higher than that of the single-layer coating, indicating the effectiveness of the FGMs to reduce the thermal expansion mismatch stress.
Standardization Program for Fracture Evaluation of Functionally Gradient Material (FGM) of Very High Temperature Application Peer-reviewed

Hideaki Takahashi, Toshiyuki Hashida, Masayuki Niino

Proc. ESA Symp. on Space Applications on Advanced Structural Materials, Noordwijk　331-337　1990
EVALUATION OF FRACTURE PROCESSES IN GRANITE BASED ON THE TENSION-SOFTENING MODEL Peer-reviewed

T HASHIDA

MICROMECHANICS OF FAILURE OF QUASI-BRITTLE MATERIALS　233-243　1990
Laser/AE Technique for Evaluating the Thermal Shock Resistance of Functionally Gradient Materials Peer-reviewed

Toshiyuki Hashida, Hideaki Takahashi

Proc. of the 10th International Acoustic Emission Symposium, Sendai　66-74　1990
Laser Irradiation Thermal Shock and Thermal Fatigue Test Procedure Peer-reviewed

Toshiyuki Hashida, Hideaki Takahashi

Proc. of the First International Symposium on Functionally Gradient Materials, Sendai　365-373　1990
CVD法により作成したSiC/C傾斜機能材料の耐熱衝撃性 Peer-reviewed

佐々木真, 平井敏雄, 橋田俊之, 高橋秀明

粉体および粉末冶金　37　(7)　966-967　1990
Publisher: Japan Society of Powder and Powder Metallurgy
DOI： 10.2497/jjspm.37.966 　

ISSN： 0532-8799

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Deposits having a compositional distribution from C to SiC were fabricated on a graphite substrate by chemical vapor deposition (CVD). The thickness of the SiC/C FGM are 0.8 mm and 1.8 mm. Under local heat con-ditions (heat flux, 5.8 MWm^-2), SiC Non FGM(NFGM) suffered cracking under the same conditions and vertical cracking was observed out of heating zone. SiC/C functionally gradient material (FGM) did not suffer cracking and was shown to be superior in thermal shock resistance. The cracking was considered to be due to the hoop tensile stress generated on un-heated surface of the specimen.
DEVELOPMENT OF A CORE-BASED TESTING METHOD FOR DETERMINING FRACTURE ENERGY AND TENSION-SOFTENING RELATION OF CONCRETE Peer-reviewed

S TERAMURA, N NOMURA, T HASHIDA, H TAKAHASHI, H MIHASHI

MICROMECHANICS OF FAILURE OF QUASI-BRITTLE MATERIALS　463-473　1990
Characterization of crack-tip strain singularity in brittle-microcracking materials by means of the photoelastic-coating method Peer-reviewed

Toshiyuki Hashida

Experimental Mechanics　29　(3)　307-311　1989/09
Publisher: Kluwer Academic Publishers
DOI： 10.1007/BF02321413 　

ISSN： 0014-4851 1741-2765
Stress Corrosion Cracking Behavior of Granite under Pressurized High Temperature Water Enviornments and Crack Propagation Resistance Peer-reviewed

T. Hashida, A. Hirano, T. Shoji, H. Takahashi

Transactions of the Japan Society of Mechanical Engineers (A)　55　(#N512)　837-842　1989
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.55.837 　

ISSN： 0387-5008

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In the development of design and control methodolgy for hot, dry rock (HDR) geothermal reservoir cracks, a full understanding of the environmentally assisted cracking behaviors of rock under the reservoir conditions is a prerequisite. In this stdy, the significance of time-dependent material degradation is demonstrated, which is induced by the water-rock interactions. In a 350°C, 18 MPa water environment, pre-immersion of 2 inch CT specimens of granite is given for different periods using an autoclave, after which the ultrasonic wave velocity measurements and fracture toughness tests are performed. The results show that the hydrothermal environment causes the time-dependent material degradation throughout the specimens tested, and that the crack propagation resistance of the granite is also time-dependent and decreases with increasing immersion time. Based on the experimental results, an immersion time-dependent crack growth model is proposed and applied to simulate the stress corrosion cracking test which has been conducted in the 350°C, 18 MPa water. It is shown that the proposed model allows us to predict the stress corrosion cracking behaviors under the pressurized high-temperature water environments.
An Evaluation of Fracture Toughness of Graphites for High Temperature Gas-Cooled Reactors by the ISRM Core Testing Method Used Jointly with AE Method Peer-reviewed

T. Oku, S. Ishiyama, H. Takahashi, T. Fukasawa, T. Hashida

TANSO　1989　(#N139)　175-181　1989
Publisher: THE CARBON SOCIETY OF JAPAN
DOI： 10.7209/tanso.1989.175 　

ISSN： 0371-5345

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The fracture toughness test together with the acoustic emission method (AE) was conducted on a fine-grained isotropic graphite (IG-11) and a coarse-grained near isotropic graphite (PGX) for the core components of High Temperature Gas-Cooled Reactors. Three different kinds of specimens were used: a cylindrical three point bending, a short rod and a round compact tension specimens. These cylindrical specimens were proposed as the standard fracture toughness test method at the International Society for Rock Mechanics (ISRM). We have used the J-integral as a parameter of the fracture mechanics, taking into consideration non-linearity of deformation observed in the graphites used here. The J-integral value (J_iAE) which was evaluated by AE method was constant independent of specimen shapes. On the basis of the results, the fracture toughness values K_IC of the graphites were evaluated: 1.04 MPa√m for IG-11 and 0.77 MPa√m for PGX . In addition, the effect of specimen size on the J_iAE values was examined.
Observation of Crack Tip Strain Field in Quasi- Brittle Materials by Means of Photoelastic Coating Method Peer-reviewed

T. Hashida

Proc. or MRS Int. Meeting on Advanced Materials, eds. by M.Doyama, S.Somiya and R.P.Chang　5　443-448　1989
Studies on Crack Propagation Resistance of Rocks Based on Hydrofrac Data of Large Specimens Peer-reviewed

H. Abé, K. Hayashi, T. Hashida

Proceedings of the SEM/RILEM Int. Conf. on Fracture of Concrete and Rock, Houston, June 1987, Springer, eds. S.P. Shah and S.E. Swaltz　354-361　1989
Tension-Softening Curve Measurements for Fracture Toughness Determination in Granite Peer-reviewed

Toshiyuki Hashida

Proc. International Workshop on Fracture Toughness and Fracture Energy-Test Methods for Concrete and Rock, A.A. Balkema, Rotterdam　47-55　1989
Studies on Crack Propagation Resistance of Rocks Based on Hydrofrac Data of Large Specimens Peer-reviewed

Hiroyuki Abé, Kazuo Hayashi, Toshiyuki Hashida

Proc. SEM/RILEM Int. Conf. on Fracture of Concrete and Rock, Houston, June 1987, Springer, eds. S.P.Shah and S.E.Swaltz　354-361　1989
TENSILE TEST OF COKE PIECE Peer-reviewed

J FUKAI, T HASHIDA, K SUZUKI, T MIURA, S OHTANI

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN　74　(11)　2209-2211　1988/11

ISSN： 0021-1575
Observation of Crack Tip Strain Distribution for Brittle Materials by Means of Photoelastic Coating Technique and Non-Linear Fracture Mechanics. Peer-reviewed

T. Fukazawa, T. Hashida, H. Takahashi

Trans. JSME (A)　54　(504)　1553-1558　1988
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.54.1553 　

ISSN： 0387-5008

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Granite, grahite and mortar are typical brittle materials. Recently, for evaluating the strength of these materials, a study based on fracture mechanics has been suggested. In general a microcrack process zone at the rack tip of brittle materials is created, which may determine the fracture process. So using the photoelastic coating method with a PLZT (transparent dielectric ceramics) plate (100-200 μm thickness), the strain field at the crack tip was directly measured. As a result, it was found that the strain field did not show the singularity of γ^-1/2, (γ=a distance from crack tip), as the strain field of linear elastic materials. When the strain distributions are normalized by J integral and the tensile stress σ_ult, they were expressed by a form of Δε=Δε₀((J/ σ_ult)/γ)^m : thus it is found that the strain field within the process zone can be described by the J integral, where Δε and m are material constants, and m is near 1. The strain field at the crack tip of the brittle materials is proportional to approximately γ^-1. The extension of the process zone, denoted by ω, is closely related to the J integral. The relationship between ω and the J integral can be expressed as a bilinear line. It is shown that the J integral at the knee point is equal to the critical J integral, value determined by AE technique. Thus the J integral can be an important parameter to evaluate the fracture behavior of brittle materials.
Effect of Anisotropy on Mixed Mode Crack Extension Behavior in Granite Peer-reviewed

H. Murata, T. Hashida, T. SHoji, H. Takahashi

Trans. JSME (A)　53　(489)　894-898　1987
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.53.894 　

ISSN： 0387-5008

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This paper describes an experimental investigation of the effect anisotropy on mixed mode crack propagation in granite by the use of asymmetric three-point bend specimens. Acoustic emission techniques were employed during the fracture tests to detect the onset of kinked crack extension. In order to characterize the fracture strength anisotropy, uniaxial tension tests and Brazilian tests were conducted, and fracture strength was measured as a function of direction with respect to the anisotropy. Based on the fracture strength data, the results of the mixed mode fracture tests were analyzed with regard to the fracture angle by means of linear elastic fracture mechanics. It is shown that the concept of a critical tensile stress at a characteristic distance, modified to account for the anisotropy of fracture strength, can explain the observed extension behaviors mixed mode cracks.
Evaluation Method for Determination of Fracture Toughness of Brittle Materials by Use of Small Sized Specimens. Peer-reviewed

T. Fukazawa, T. Hashida, H. Takahashi

Trans. JSME (A)　53　(493)　1786-1792　1987
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.53.1786 　

ISSN： 0387-5008

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Recently, core based specimens have been proposed for standard fracture toughness testing rock, in a draft of the testing standard of the International society for Rock Mechanics (ISRM), which recommends two chevron-notched specimens. In this study, fracture toughness tests, according to the recommended testing procedure, were conducted on chevron-notched core based specimens of granite. In addition to these specimens, straight-notched core specimens with three different geometries were also tested, where the J-integral approach and AE technique were used to determine fracture toughness and the effect of specimen geometry on fracture toughness was examined. As a result it was found that the ISRM test method yields inconsistent fracture toughness values depending on the specimen geometry. Finally it was shown that the J-integral/AE method as applied to straight-notched specimens provides a suitable evaluation procedure for the fracture toughness testing of rock. Furthermore, the test method developed in this study was applied to other brittle materials which were nuclear grade graphites and mortar.
Fracture Strength Determination of Concrete by Use of Breakoff Tester and Acoustic Emission Technique Peer-reviewed

Y. Fukugawa, S. Kobayashi, H. Takahashi, T. Hashida

CAJ Review of the 41st Geneval Meeting　41　339-342　1987
Fracture Toughness Determination of Concrete and Reactor Surveillance by Use of Breakoff Tester and Acoustic Emission Technique. Peer-reviewed

T. Hashida, H. Takahashi

Trans. the 9th International Conference on Structural Mechanics in Reactor Technology,ed.F.H. Wittmann　187-192　1987
Simulation of the Extension Behavior of a Hydraulically Induceed Crack by Use of Brittle Epoxy Specimens Peer-reviewed

T. Hashida, T. Shoji, M. Muramatu

Trans. JSME(A)　52　(480)　1906-1912　1986
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.52.1906 　

ISSN： 0387-5008

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The extension behaviour of a hydraulically induced crack under the simplified conditions of tectonic stresses was simulated experimentally by use of brittle epoxy specimens with boreholes. The results were described by means of linear elastic fracture mechanics, where a criterion for the onset of crack extension is a critical tensile stress at a characteristic distance deduced from the experimental results. Based upon the criterion with a maximum stress criterion for fracture angles, a predictive procedure for breakdown pressure and fracture angles during hydraulic fracturing was proposed.
SIMPLE DETERMINATION OF THE EFFECTIVE YOUNGS MODULUS OF ROCK BY THE COMPLIANCE METHOD Peer-reviewed

T HASHIDA, H TAKAHASHI

JOURNAL OF TESTING AND EVALUATION　13　(1)　77-84　1985

ISSN： 0090-3973
Determination of Fracture Toughness of Granitic Rock by Means of AETechnique. Peer-reviewed

H. Takahashi, T. Hashida, K. Tamakawa, S. Yuda, M. Suzuki

Journal of the Mining and Materials Processing Institute of Japan　100　(1151)　17-21　1984
Publisher:
DOI： 10.2473/shigentosozai1953.100.1151_17 　

ISSN： 0369-4194
Evaluation of Resistances to the Elastic-Plastic Plane Strain Crack Initiation and Growth Using Small Fracture Toughness Specimen Peer-reviewed

T. Hashida, M. Saka, H. Anzai, T. Shoji, H. Takahashi

Trans. JSME (A)　48　(433)　1111-1119　1982
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.48.1111 　

ISSN： 0387-5008
Determination of Fracture Toughness of Granitic Rock by Means of AE Technique. Peer-reviewed

T. Hashida, S. Yuda, K. Tamakawa, H. Takahashi

Proc. 6th International Acoustic Emission Symposium, the Japanese Society for Non- Destructive Inspection.　78-89　1982

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Misc. 144

水潤滑環境下におけるCNT/アルミナ複合材料の摩擦摩耗特性に及ぼすCNT表面修飾の影響に関する研究 Peer-reviewed

白須圭一, 宮浦拓人, 山本剛, 橋田俊之

日本機械学会第26回機械材料・材料加工技術講演会（M&P2018）講演論文集　2018/11
Effect of crystallinity on axial thermal expansion coefficient of carbon nanotubes: Experimental and simulation studies Peer-reviewed

Keiichi Shirasu, Go Yamamoto, Toshiyuki Hashida

Proceedings of the 5th Asian Symposium on Materials and Processing　2018
147 In-situ Evaluation of Mechanical and Electrochemical Degradation in Anode Materials for Lithium-Ion Secondary Batteries

YOSHIDA Naoki, SAKAMOTO Tadashi, KUWATA Naoaki, KAWAMURA Junichi, SATO Kazuhisa, HASHIDA Toshiyuki

2016　(51)　91-92　2016
Publisher: The Japan Society of Mechanical Engineers
165 Estimation of Permeability Distribution Based on Temperature and Pressure Well-Logging Data for Geothermal Energy Development

ASAKI Miho, NIIBORI Yuichi, HASHIDA Toshiyuki

2016　(51)　127-128　2016
Publisher: The Japan Society of Mechanical Engineers
142 Evaluation of Thermal Expansion Properties of Aligned Multi-Walled Carbon Nanotube Reinforced Epoxy Composites and its Application

NAKAMURA Akihiro, SHIRASU Keiichi, TAMAKI Itaru, YAMAMOTO Go, HASHIDA Toshiyuki

2016　(51)　81-82　2016
Publisher: The Japan Society of Mechanical Engineers
149 Evaluation of air oxidation and electrochemical oxidation of Ni-YSZ cermets for SOFC anode

SATO Michiyoshi, SATO Kazuhisa, HASHIDA Toshiyuki, SUMI Hirofumi, SAKAMOTO Tadashi

2016　(51)　95-96　2016
Publisher: The Japan Society of Mechanical Engineers
166 Estimation of Subsurface Natural Fracture Network Based on Tracer Responses for Geothermal Energy Development

IWAGAKI Takumi, SUZUKI Anna, HASHIDA Toshiyuki

The Proceedings of Conference of Tohoku Branch　2016　(0)　129-130　2016
Publisher: The Japan Society of Mechanical Engineers
GS0608-254 Electrochemical degradations caused by mechanical damages in Li-ion battery electrodes

YOSHIDA Naoki, SAKAMOTO Tadashi, KUWATA Naoaki, KAWAMURA Junichi, SATO Kazuhisa, HASHIDA Toshiyuki

2015　"GS0608-254-1"-"GS0608-254-3"　2015/11/21
Publisher: The Japan Society of Mechanical Engineers

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Silicon is a promising anode material for lithium-ion battery application due to its high specific capacity. However, when silicon is lithiated, it can undergo a volume expansion, which leads to an extensive fracturing. This is thought to be a primary cause of the rapid decay in cell capacity routinely observed.. To solve this problem, a more thorough understanding of how the material degrades is necessary to help cycling techniques that may be capable of reduce capacity fading. In this study, we report in situ acoustic emission and laser microscope observation of volume change in Si negative electrodes. The largest number of emissions occurred on the first lithiation and corresponding to volume change of the silicon negative electrode. this study demonstrates that AE and laser microscope observation is a powerful tool to survey the real-time mechanical damage and electrochemical degradation in the electrode.
OS15-2 Determination of Fracture Properties in Ion Conducting Ceramics under Simulated Operating Conditions for Solid Oxide Fuel Cells(Durability and reliability of next-generation energy systems 1,OS15 Durability and reliability of next-generation energy systems,APPLICATIONS)

Muraoka Ryo, Taguchi Takahiro, Watanabe Satoshi, Sato Kazuhisa, Hashida Toshiyuki

Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics　2015　(14)　214-214　2015/10/04
Publisher: The Japan Society of Mechanical Engineers
トレーサー応答に基づく複雑地下き裂分布の推定法に関する研究

岩垣巧, 鈴木杏奈, 橋田俊之

日本地熱学会学術講演会講演要旨集　2015　P41　2015
地熱開発のための温度・圧力検層データを用いた地下浸透率分布の推定

近藤早紀, 鈴木杏奈, 岩垣巧, 朝木美帆, 新堀雄一, 橋田俊之

日本機械学会東北支部総会・講演会講演論文集(CD-ROM)　50th　ROMBUNNO.168　2015
Fabrication and characterization of silicon micromirror with carbon nanotubes-nickel nanocomposite beams

Zhonglie An, Zhonglie An, Masaya Toda, Go Yamamoto, Toshiyuki Hashida, Takahito Ono

Proceedings of the IEEE Conference on Nanotechnology　888-892　2014/11/26

DOI： 10.1109/NANO.2014.6968008 　
J0610206 Stress Variation of Solid Oxide Fuel Cells under Operating Conditions

ENOMOTO Shota, SATO Kazuhisa, HASHIDA Toshiyuki

Mechanical Engineering Congress, Japan　2014　"J0610206-1"-"J0610206-2"　2014/09/07
Publisher: The Japan Society of Mechanical Engineers

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Solid Oxide Fuel Cells (SOFC) can realize very high power generation efficiency to convert the chemical energy of H_2 directly into electrical energy. Achieving practical SOFCs will require more than just improvement in power generation performance; ensuring reliability and durability will also be crucial. So, in this study, the influences of chemically induced expansion on the fracture damage of SOFCs were investigated by using numerical stress and deformation analyses under operating condition. The SOFC model cell examined in this study was composed of electrolyte YSZ, GDC, LSGM and LSGMC, respectively. The finite element method (FEM) was employed to calculate the residual stress, thermal stresses, and chemically induced expansion stresses for the single cell.
OS1601 In-situ Observation of Solid State Electrochemical Devices for Improvement of Reliability

SATO Kazuhisa, HASHIDA Toshiyuki, KUWATA Naoaki, KAWAMURA Junichi

2014　"OS1601-1"-"OS1601-2"　2014/07/19
Publisher: The Japan Society of Mechanical Engineers

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A simple mechanical damage testing method, combined with Acoustic Emission (AE) monitoring was developed in order to investigate the mechanical performance of solid state electrochemical devices under operating conditions. The damage testing method was applied to solid oxide fuel cells and lithium ion batteries. The damage process was shown to involve cracking in the electrode and electrolyte, and the fracture damage was most likely due to chemical expansion-induced stresses. It was demonstrated that the AE method enabled us to detect the above-mentioned damage process and to determine the condition for the onset of the damage in the newly electrochemical devices.
OS0525 Preparation and mechanical evaluation of aligned multi-walled carbon nanotube/epoxy composites

NAKAMURA Akihiro, SHIRASU Keiichi, YAMAMOTO Go, SHIMAMURA Yoshinobu, INOUE Yoku, HASHIDA Toshiyuki

2014　"OS0525-1"-"OS0525-3"　2014/07/19
Publisher: The Japan Society of Mechanical Engineers

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Two types of epoxy composites reinforced with an aligned multi-walled carbon nanotube (MWCNT) sheet and its thermal annealed analog were prepared and the effects of thermal annealing on the mechanical properties of the composites were investigated by conducting uniaxial tensile tests. The MWCNTs with lengths exceeding 1 mm were vertically grown on a Si substrate by chemical vapor deposition method, and were converted to horizontally aligned MWCNT sheets by pulling them out. The MWCNT sheets were then thermally-annealed at 2000℃ under Ar + 5% H_2 atmosphere. The composites containing annealed MWCNTs exhibited higher Young's modulus and tensile strength than those of the composites containing as-received MWCNTs. Uniaxial tensile experiments of individual MWCNTs revealed that thermal annealing led to an increase in Young's modulus, suggesting that the improvement in Young's modulus of the composites may be associated with the increase in the mechanical properties of individual MWCNTs. Young's modulus and tensile strength of the composites containing 22 vol.% annealed MWCNTs reached 94 ± 11 GPa and 474.2 ± 57.7 MPa, respectively.
GS21 Friction Properties of Multi-Walled Carbon Nanotube/Alumina Composites Prepared by Flocculation Method

NAKAMURA Takafumi, WANG Weili, SHIRASU Keiichi, YAMAMOTO Go, HASHIDA Toshiyuki

2014　"GS21-1"-"GS21-3"　2014/07/19
Publisher: The Japan Society of Mechanical Engineers

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Carbon nanotubes (CNTs) have extremely high tensile strength and elastic modulus, good flexibility and low density. In addition, CNTs are expected to have lubrication properties like other carbon-derived materials including graphite and diamond-like carbon. In this study, alumina ceramics reinforced with multi-walled CNTs (MWCNTs) were prepared by a flocculation method and the effects of the MWCNT content on mechanical and tribological properties of the composites were investigated. The results showed that the bending strength and fracture toughness simultaneously increased for the composite containing 10.0 vol.% MWCNTs. The friction coefficient of the composites containing 5.5 vol.% MWCNTs was about 0.15, measured by the ball-on-disk wear tests using alumina balls as a counterpart in air. Microstructural observations of the fractured and polished surfaces of the composites implied that the size of a MWCNTs agglomerate is one of the important factors for improving friction properties of the composite. It is suspected that there may be an optimal MWCNTs content for improving the mechanical and friction properties of the composites.
140 ナノ領域特性評価に基づくカーボンナノチューブ/アルミナ複合材料の破壊機構解明に関する研究

野坂陽, 王偉礼, 白須圭一, 山本剛, 橋田俊之

講演論文集　2014　(49)　81-82　2014
Publisher: 一般社団法人日本機械学会
120 機械・電気・化学的因子を考慮した固体酸化物形燃料電池の応力解析

榎本翔太, 佐藤一永, 橋田俊之

講演論文集　2014　(49)　41-42　2014
Publisher: 一般社団法人日本機械学会
温度検層データを用いた地下浸透率分布推定法に関する基礎的研究

近藤早紀, 岩垣巧, 朝木美帆, 鈴木杏奈, 新堀雄一, 橋田俊之

日本地熱学会学術講演会講演要旨集　2014　P33　2014
非整数階微分を用いたトレーサー解析に基づく地下き裂長さ分布の推定に関する研究

岩垣巧, 近藤早紀, 鈴木杏奈, 橋田俊之

日本地熱学会学術講演会講演要旨集　2014　P29　2014
カーボンナノチューブの機械的特性

山本剛, 白須圭一, 玉木格, 橋田俊之

日本複合材料学会誌　40　(6)　255-259　2014
Publisher: 日本複合材料学会
ISSN： 0385-2563
Modeling mass and heat transfer in geothermal reservoirs using fractional differential equations

Suzuki Anna, Horne Ronald N, Makita Hiroshi, Niibori Yuichi, Fomin Sergei, Chugunov Vladimir, Hashida Toshiyuki

Proceedings of the 10th International Conference on Flow Dynamics　2013/11
J061023 Effect of Uniaxial strain on conductivities and non-stoichiometry change of oxygen ion and mixed conductors

SATO Kazuhisa, HASHIDA Toshiyuki

Mechanical Engineering Congress, Japan　2013　"J061023-1"-"J061023-2"　2013/09/08
Publisher: The Japan Society of Mechanical Engineers

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The influence of uniaxial compressive stress on the oxygen ion and mixed conductivity of Zr_<0.82>Y_<0.18>O_<1.91>, Ce_<0.9>Gd_<0.1>O_<1.95-δ>,Yba_2Cu_3O_<7-δ>,and La_2NiO_<4+δ> were investigated by using AC 4 probe method under controlled oxygen partial pressure condition. The applied compressive stress was ranged from 0 Mpa to 350 MPa for these specimens in air at 600℃. In order to clarify the reason for the phenomenon of conductivity change, the mixed conductivity of Ce_<0.9>Gd_<0.1>O_<1.95-δ> for the application of stresses were measured under reducing conditions. The experimental result revealed that as the application compressive stress increases, the carrier concentration remain steady, whereas the mobility decreases. The conductivity was decreased with increasing compressive strain, this trend agreed with that of the simulation results. Therefore, the decrease of mobility was considered to be the reason for the decline conductivity under compressive strain/stress conditions.
J061012 Investigation of the Degradation Process of the Ni/YSZ Electrode Using Computer Simulation

XU Jingxiang, HIGUCHI Yuji, OZAWA Nobuki, SATO Kazuhisa, HASHIDA Toshiyuki, KUBO Momoji

Mechanical Engineering Congress, Japan　2013　"J061012-1"-"J061012-3"　2013/09/08
Publisher: The Japan Society of Mechanical Engineers

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Sintering of nickel nanoparticles during the long-term operation leads to the degradation of the Ni/YSZ anode. To prevent the sintering, understanding of the sintering process in the Ni/YSZ anode with a porous structure is needed. In this work, to investigate the effect of porosity of the Ni/YSZ anode on the sintering, we modeled the Ni/YSZ multi-nanoparticle models with the porosity of 0.25 and 0.45 and simulated the sintering in the models by using our developed multi-nanoparticle molecular dynamics simulation method that can consider the effects of the properties of the porous structure such as porosity and YSZ nanoparticle framework, etc. It was revealed that the YSZ framework prevented the sintering of nickel nanoparticles in the small pore of the YSZ framework. Furthermore, it was found that the degree of sintering of nickel nanoparticles in the Ni/YSZ model with the porosity of 0.25 is smaller than that of 0.45, because the decrease in the porosity leads to the decrease in the pore size of the YSZ framework. Thus, we suggest that decreasing the porosity of Ni/YSZ anode can inhibit the sintering of nickel nanoparticles.
J061011 Evaluation of mechanical properties of Ni/NiO-YSZ under high temperature/redox cycle

MIYASAKA Taihei, SATO Kazuhisa, HASHIDA Toshiyuki

Mechanical Engineering Congress, Japan　2013　"J061011-1"-"J061011-2"　2013/09/08
Publisher: The Japan Society of Mechanical Engineers

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Effects of redox cycling on the mechanical properties of the Ni/NiO-YSZ cermets were investigated by using a Small Punch (SP) testing method. The porosity range in the Ni-YSZ cermets tested in this study was 5-50%. Experimental results obtained from the in-situ SP tests demonstrated that ductile-like fracture under the reduction environment at 800℃ and damage cause by redox cycling degraded the fracture stress of the NiO-YSZ composites at low porosity. This study revealed that porosity makes a key contribution to the durability of Ni-YSZ cermets by the redox cycling.
130 Evaluation of mechanical properties of Ni-YSZ cermets for SOFCs under simulated environments of redox cycling

MIYASAKA Taihei, SUKINOU Shinji, WATANABE Satoshi, YASHIRO Keiji, KAWADA Tatsuya, SATO Kazuhisa, HASHIDA Toshiyuki

2013　(48)　62-63　2013/03/15
Publisher: The Japan Society of Mechanical Engineers
トレーサー応答および地下温度分布を用いた地熱貯留層内き裂分布の推定に関する研究

蒔田浩士, 近藤早希, 鈴木杏奈, 新堀雄一, 橋田俊之

日本機械学会東北支部総会・講演会講演論文集　48th　168-169　2013/03
分子動力学法を用いた固体酸化物形燃料電池アノードにおけるドーパントがシンタリングに及ぼす影響の解析

XU Jingxiang, 坂之井遼太, 石川岳志, 樋口祐次, 尾澤伸樹, 佐藤一永, 橋田俊之, 久保百司

電気化学会大会講演要旨集　80th　2013
分子動力学法及び密度汎関数法によるSOFC用電解質の亀裂進展メカニズムの解析

坂之井遼太, XU J., 石川岳志, 樋口祐次, 尾澤伸樹, 佐藤一永, 橋田俊之, 久保百司

電気化学会大会講演要旨集　80th　2013
温度検層データに基づく貯留層浸透率分布の推定法に関する基礎的研究

近藤早紀, 鈴木杏奈, 蒔田浩士, 新堀雄一, 橋田俊之

日本地熱学会学術講演会講演要旨集　2013　46　2013
断裂型貯留層における還元に伴う物質移動予測

鈴木杏奈, 近藤早紀, 新堀雄一, 橋田俊之

日本地熱学会学術講演会講演要旨集　2013　72　2013
SOFCの耐久性・信頼性向上のための構成材料の機械的基礎物性研究

佐藤一永, 渡辺智, 雨澤浩史, 川田達也, 橋田俊之

セラミックス　48　(3)　159-164　2013
固体酸化物燃料電池の機械的特性のin situ測定，熱測定

雨澤浩史, 佐藤一永, 橋田俊之, 川田達也

熱測定　40　(1)　23-29　2013
SL10 Development of CNT Composite Materials

YAMAMOTO Go, SHIRASU Keiichi, NOZAKA Yo, OMORI Mamoru, TAKAGI Toshiyuki, HASHIDA Toshiyuki

2012　"SL10-1"-"SL10-3"　2012/09/22
Publisher: The Japan Society of Mechanical Engineers

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Carbon nanotubes (CNTs) have attracted enormous attention from many researchers of material science, and their physical properties have been intensively clarified. The next step of carbon nanotube research should be development of high performance CNT materials with industrial applications. Production of CNT composites represents one of great targets for the application. In this study, alumina has been selected as the matrix of CNT composites because of its low cost and high performance. The final goal is to develop a design-fabrication-evaluation methodology for CNT ceramic matrix composites and to produce high performance composites on the basis of the method to be developed. MWCNT/alumina composites were prepared by a simple mechanical mixing method followed by pressureless sintering. The effects of MWCNT addition on mechanical, tribological and electromagnetic-wave absorption properties of the pressureless sintered-MWCNT/alumina composites will be discussed.
GS37 Effects of Strength Properties and Dispersibility of Carbon Nanotube on the Fracture Properties of Carbon Nanotube/Alumina Composites

SHIRASU Keiichi, YAMAMOTO Go, NOZAKA Yo, OMORI Mamoru, TAKAGI Toshiyuki, HASHIDA Toshiyuki

2012　"GS37-1"-"GS37-3"　2012/09/22
Publisher: The Japan Society of Mechanical Engineers

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In this research, effects of the multi-walled carbon nanotubes (MWCNTs) addition on mechanical properties and microstructures of spark plasma-sintered MWCNT/alumina composites were investigated by using four types of MWCNTs that were annealed at different temperatures. The annealing temperatures were 1200, 1800, 2200 and 2600℃. Experimental results showed that bending strength of the composites was increased up to 1800℃, and they were decreased gradually with increasing annealing temperature of MWCNTs. According to the fracture surface observation, dispersibility of the MWCNTs tended to decrease with increasing the annealing temperature of the MWCNTs, and fracture toughness of the composites corresponded to the dispersibility of the MWCNTs. The present study implies that the effectiveness of the use of MWCNTs having a higher load carrying capacity and dispersibility for preparation of stronger and tougher ceramic composites.
GS13 Influence of Redox Cycling on Mechanical Properties of Ni-YSZ Cermets for SOFCs

MIYASAKA Taihei, SUKINOU Shinji, WATANABE Satoshi, KAWADA Tatsuya, SATO Kazuhisa, HASHIDA Toshiyuki

2012　"GS13-1"-"GS13-3"　2012/09/22
Publisher: The Japan Society of Mechanical Engineers

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Effects of redox cycling on the mechanical properties of the Ni-YSZ cermets were investigated by using an in-situ small punch (SP) testing method as a function of porosity, and influence of the redox cycling on the volume expansion of Ni-YSZ cermets was examined by using a thermo-mechanical analysis (TMA) as a function of porosity and Ni/YSZ volume ratio. Experimental results obtained from the in-situ SP tests demonstrated that ductile-like fracture took place under the reducing environment at 800℃. It was shown that mechanical degradation due to redox cycling was mitigated for the Ni-YSZ cermets with higher porosities greater than 30 vol. %. Higher porosities and lower Ni content were useful to maintain the dimensional stability of the Ni-YSZ cermets. Based on the experimental results, a quantitative correlation was proposed which predict the volume expansion from porosity volume and Ni content.
J056046 Computational Simulation on Fracture Properties of Gadolinia Doped Ceria Electrolytes for Solid Oxide Fuel Cell

SAKANOI Ryota, XU Jingxiang, HIGUCHI Yuji, OZAWA Nobuki, SHIMAZAKI Tomomi, SATO Kazuhisa, HASHIDA Toshiyuki, KUBO Momoji

Mechanical Engineering Congress, Japan　2012　"J056046-1"-"J056046-3"　2012/09/09
Publisher: The Japan Society of Mechanical Engineers

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In this paper, we discuss the fracture properties of gadolinia doped ceria (GDC) electrolytes for solid oxide fuel cell (SOFC), based on molecular dynamics (MD) simulation and density functional theory (DFT). The ceria based materials like a GDC are expected as electrolytes to lower the operating temperature, however, the short lifetime of GDC prevents their wide applications. Therefore, we executed the tensile test using the MD simulation and DFT calculation and obtained the Young's modulus and the fracture stress of the GDC. Both indicate phase transition where the oxygen coordination number of Ce^<4+> ions changes from eight to six after the yield point. Furthermore, we calculated the Young's modulus and the fracture stress as functions of oxygen concentration. This result shows that the Young's modulus decreases linearly when the oxygen concentration increases, while the fracture stress is insensitive to the changes. This tendency is in good agreement with experimental data qualitatively. We also discuss the effect of steam condition on the fracture properties of GDC, and find the crack advance of GDC is accelerated by the chemical reaction with H_2O molecules.
S042013 Fabrication and Evaluation of Carbon Nanotube/Alumina Composites by Pressureless Sintering and Influence of Carbon Nanotube Tensile Strength on Their Composite Mechanical Properties

YAMAMOTO Go, SHIRASU Keiichi, NOZAKA Yo, TAKAGI Toshiyuki, HASHIDA Toshiyuki

Mechanical Engineering Congress, Japan　2012　"S042013-1"-"S042013-5"　2012/09/09
Publisher: The Japan Society of Mechanical Engineers

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In this research, the effects of MWCNT addition on mechanical properties and microstructures of pressureless sintered MWCNT/alumina composites were investigated by using four types of MWCNTs having different fracture characteristics and dispersibility. It was demonstrated that it is possible to fabricate MWCNT/alumina composites by pressureless sintering at a temperature of 1400℃. Fracture tests showed that the MWCNTs annealed at 2200℃ was the most effective in improving the mechanical properties of the MWCNT/alumina composites, and 0.9 vol.% MWCNT addition resulted in 25% and 45% simultaneous increase in bending strength (742.6 ± 13.1 MPa) and fracture toughness (5.83 ± 0.19 MPa m^<1/2>), respectively, compared with MWCNT-free sintered bodies. An improvement in the fracture properties may be attributed to the use of the MWCNT having a higher load carrying capacity. For the larger amount of the MWCNTs, strong correlation between mechanical properties of the composites and dispersibility of the MWCNTs was observed, and the degradation of mechanical properties was shown to be primarily attributed to the severe phase segregation. Our finding suggests that the important factor for the preparation of ceramics composites with MWCNT for higher strength and toughness will thus be the use of MWCNT having a much higher load carrying capacity as well as a good dispersion in the matrix.
J056011 Information Technique for Improvement of Reliability on Solid Electrochemical Devices

SATO Kazuhisa, FUKUI Kenichi, NUMAO Masayuki, KUWATA Naoaki, KAWAMURA Junichi, HASHIDA Toshiyuki

Mechanical Engineering Congress, Japan　2012　"J056011-1"-"J056011-3"　2012/09/09
Publisher: The Japan Society of Mechanical Engineers

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New energy conversion systems develop in environmental fields, and make its presence greater and greater. Data mining method was developed in order to investigate the mechanical and electrochemical degradations process of solid electrochemical devices under operating conditions. By using this method, it was possible to show and help the possibility that detailed degradation process can be evaluated visually and in real-time, even when applied to modules at the actual equipment level. On the other hand, as service science intends to scientifically reveal the mechanism and principle in order to create new energy devices, there emerges a lot of interdisciplinary approach of the brand-new field. While traditional marketing theories have provided frameworks of how to grasp, reach, and lure as many customers as possible, none of them can externalize the functional structure of any service knowledge, and offer methodology of handling them on computer. Aiming at computationally utilizing any service knowledge, we discuss service ontology by both analogies with functional ontology on ontology engineering, and by comparison with typical marketing theory. In addition, we introduce case study that are based on ontology, and show how to create knowledge by this theory.
J056044 Evaluation of Expansion Behavior of Ni-YSZ Cermets during Redox Cycling

MIYASAKA Taihei, SUKINOU Shinji, YASHIRO Keiji, KAWADA Tatsuya, MIZUSAKI Junichiro, SATO Kazuhisa, HASHIDA Toshiyuki

Mechanical Engineering Congress, Japan　2012　"J056044-1"-"J056044-3"　2012/09/09
Publisher: The Japan Society of Mechanical Engineers

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Effects of of the redox cycling on the volume expansion of Ni-YSZ cermets was investigated as a function of porosity and Ni/YSZ volume ratio by using a thermo-mechanical analysis (TMA). The first re-oxidation tests results obtained from TMA demonstrated that the amount of expansion was decreased and suppressed by lowering the Ni content of the anode and increasing the porosity. However specemen which had the large amount of Ni (50 vol.%) and the high porosity (34%) showed the high dimensional stability after several redox cycls. The large shrinkage upon reduction coused by the large amount of Ni and the low expantion upon oxidation caused by the high porosity enhanced redox reversibility.
J056045 Molecular Dynamics Simulation of Dopant Effects on Sintering Process in Solid Oxide Fuel Cell Anode

XU Jingxiang, SAKANOI Ryota, HIGUCHI Yuji, OZAWA Nobuki, SHIMAZAKI Tomomi, SATO Kazuhisa, HASHIDA Toshiyuki, KUBO Momoii

Mechanical Engineering Congress, Japan　2012　"J056045-1"-"J056045-3"　2012/09/09
Publisher: The Japan Society of Mechanical Engineers

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The dopant effects on the sintering process of nickel nanoparticles in the nickel and doped zirconia cermet anode were investigated by using molecular dynamics (MD) simulation. In this study, we unraveled the differences of the sintering process, the surface area of the nickel nanoparticles, and the triple phase boundary (TPB) length between the Ni/YSZ and the Ni/ScSZ systems. According to the simulation results, we observed that the extent of sintering in the Ni/YSZ is larger than that in the Ni/ScSZ due to the dopant effect. These observations revealed that the sintering on the YSZ surface takes place more easily than that on the ScSZ surface. Then, the mechanism of the dopant effect on the sintering of nickel nanoparticles is investigated by using density functional theory (DFT). It was found that the low adsorption energy between the nickel and the doped zirconia decreases the movement of the nickel nanoparticles and inhibits the sintering of the nickel nanoparticles on the doped zirconia surface.
Investigation on CNT/alumina interface properties using molecular mechanics simulations (vol 49, pg 3701, 2011)

Sen Liu, Ning Hu, Go Yamamoto, Yindi Cai, Yajun Zhang, Yaolu Liu, Yuan Li, Toshiyuki Hashida, Hisao Fukunaga

CARBON　50　(7)　2677-2677　2012/06

DOI： 10.1016/j.carbon.2012.02.012 　

ISSN： 0008-6223
146 Mechanical Properties of Multi-Walled Carbon Nanotube/Alumina Composites Prepared by Pressureless Sintering

YAMAMOTO Go, SHIRASU Keiichi, NOZAKA Yo, OMORI Mamoru, TAKAGI Toshiyuki, HASHDA Toshiyuki

2012　(47)　98-99　2012/03/13
Publisher: The Japan Society of Mechanical Engineers
178 Effect of temperature on the mechanical properties of Ni/NiO-YSZ cermets for SOFC anodes

WATANABE Satoshi, MIYASAKA Taihei, SUKINOU Shinji, SATO Kazuhisa, AMEZAWA Koji, HASHIDA Toshiyuki, KAWADA Tatsuya

2012　(47)　162-163　2012/03/13
Publisher: The Japan Society of Mechanical Engineers
214 Dimensional Behavior of Ni-YSZ Cermets during Redox Cycling

SUKINO Shinji, MIYASAKA Taihei, SATO Kazuhisa, YASHIRO Keiji, KAWADA Tatsuya, MIZUSAKI Junichiro, HASHIDA Toshiyuki

2012　(47)　234-235　2012/03/13
Publisher: The Japan Society of Mechanical Engineers
215 Development of Fabrication Method of Carbon Nanotube/Alumina Composites and Evaluation of Their Mechanical Properties

SHIRASU Keiichi, YAMAMOTO Go, NOZAKA You, OMORI Mamoru, HASHIDA Toshiyuki

2012　(47)　236-237　2012/03/13
Publisher: The Japan Society of Mechanical Engineers
断裂型地熱貯留層におけるき裂構造推定のためのトレーサー挙動のキャラクタリゼーション

鈴木杏奈, 蒔田浩士, 新堀雄一, 橋田俊之

日本機械学会東北支部総会・講演会講演論文集　47th　14‐15　2012/03
Correlation between small punch and CVN impact tests for evaluation of cryogenic fracture characteristics of isothermally-aged nitrogen-containing austenitic stainless steels Peer-reviewed

Maribel Leticia, Saucedo-Muñoz, Toshiyuki Hashida, Tetsuo Shoji, Victor Manuel Lopez-Hirata

Materials Research　15　218-223　2012/03/01

DOI： 10.1590/S1516-14392012005000026 　

ISSN： 1516-1439
トレーサー応答・温度データに基づく貯留層内き裂分布の推定に関する研究

蒔田浩士, 鈴木杏奈, 新堀雄一, 橋田俊之

日本地熱学会学術講演会講演要旨集　2012　18　2012
非整数階微分を用いたトレーサー解析による貯留層挙動評価

鈴木杏奈, 蒔田浩士, 新堀雄一, 橋田俊之

日本地熱学会学術講演会講演要旨集　2012　19　2012
OS2209 Mechanical Behavior of Ni-YSZ Cermets in Redox Cycling Conditions

MIYASAKA Taihei, SUKINOU Shinji, WATANABE Satoshi, SATO Kazuhisa, HASHIDA Toshiyuki

2011　"OS2209-1"-"OS2209-3"　2011/07/16
Publisher: The Japan Society of Mechanical Engineers

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Solid Oxide Fuel Cell (SOFC) can generate high efficiency electric power using H_2 and O_2 gases without environmental pollution. SOFC is expected to become a major electric power source in the future. Under normal operating conditions, fuel is supplied at the anode (Ni-YSZ) and Ni is kept in its reduced state. However, the Ni may be re-oxidized due to factors such as high fuel utilization, accidental interruption of fuel gas supply, and leakage of air. Re-oxidation of Ni-YSZ causes a change in the volume of the anode, and this change causes degradation of SOFC. We study the relationship between the porosity and mechanical properties with Ni-YSZ under the reducing environment and the oxidizing environment for reliable SOFCs. We evaluated the mechanical properties of Ni-YSZ by using an in-situ Small Punch (SP) test method. Experimental results obtained from the SP tests demonstrated that there are weak relationship between porosity and mechanical properties with Ni-YSZ under reducing environment (at an oxygen partial pressure of 10^<-2>5atm, 800℃). Then re-oxidation of Ni-YSZ cermets resulted in residual stress in the anode itself. But these stress can be reduced with increasing porosity. It is suggested that higher porosity Ni-YSZ can avoid the degradation of the mechanical properties.
145 CO_2 sorption behavior of rocks for CO_2 geological storage

FUJII Takashi, NAKAGAWA Satomi, SATO Yoshiyuki, INOMATA Hiroshi, HASHIDA Toshiyuki

2011　(46)　94-95　2011/03/15
Publisher: The Japan Society of Mechanical Engineers
191 Observation of the Carbon Nanotube/Alumina Composites Fracture Process and Improvement of Their Mechanical Properties

SHIRASU Keiichi, YAMAMOTO Go, OMORI Mamoru, AIZAWA Yoichi, HASHIDA Toshiyuki

2011　(46)　184-185　2011/03/15
Publisher: The Japan Society of Mechanical Engineers
地熱貯留層涵養を目的とした複雑き裂システムにおける物質移動モデルに関する研究

鈴木杏奈, 千葉隆一, 蒔田浩士, 新堀雄一, 橋田俊之

日本機械学会東北支部総会・講演会講演論文集　46th　214-215　2011/03
複雑系物質移動モデルに基づくトレーサー解析手法の開発

蒔田浩士, 鈴木杏奈, 新堀雄一, 橋田俊之

日本地熱学会学術講演会講演要旨集　2011　51　2011
断裂型貯留層における注水涵養に向けたトレーサー挙動予測

鈴木杏奈, 蒔田浩士, 新堀雄一, 橋田俊之

日本地熱学会学術講演会講演要旨集　2011　77　2011
112 Preparation of Carbon Nanotube Reinforced Alumina Composites and Examination of Their Fracture Mechanisms

SHIRASU Keiichi, YAMAMOTO Go, OMORI Mamoru, TAKAGI Toshiyuki, HASHIDA Toshiyuki

Materials and processing conference　2010　(18)　"112-1"-"112-5"　2010/11/27
Publisher: The Japan Society of Mechanical Engineers
007 Evaluation of Crack Bridging Characteristic in Carbon Nanotube/Alumina Composites Using Single Fiber Pullout Testing Method

YAMAMOTO Go, SHIRASU Keiichi, TAKAGI Toshiyuki, HASHIDA Toshiyuki

2010　274-276　2010/10/09
Publisher: The Japan Society of Mechanical Engineers

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The crack bridging behavior of multi-walled carbon nanotube-reinforced alumina matrix composites has been investigated using a single fiber pullout testing method. Contradictory to the conventional understanding (which have reported that pullout phenomena evidently occurred in the bulk nanotube-reinforced alumina composites), the pullout experiments using an in situ SEM method with a nanomanipulator system demonstrated that strong load transfer was revealed, and no pullout behavior was observed for all 15 MWCNTs. The MWCNTs, rather than puffing out from the alumina matrix broke in the outer-shells and the inner section pulled away, leaving the outer-shells of the fragment in the matrix. This implies that tougher ceramics with MWCNT can be obtained by creating the appropriate interaction between the matrix and MWCNT: not too week but also not too strong to permit an adequate load transfer between the two parts and thus a consequent pulling out without breakage of MWCNT. Our finding suggests important implications for design of tougher ceramic with MWCNTs. The important factor for such tougher ceramics will thus be the use of 'strong' NWCNTs having higher mechanical performance (as well as a good dispersion in the matrix).
008 Effect of Surface Modification of Carbon Nanotube on the Strength Properties of Carbon Naotube/Alumina Composites and their Fracture Process

SHIRASU Keiichi, YAMAMOTO Go, OMORI Mamoru, AIZAWA Yoichi, HASHIDA Toshiyuki

2010　271-273　2010/10/09
Publisher: The Japan Society of Mechanical Engineers

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We report the mechanical properties and microstructures of multi-walled carbon nanotube (MWCNT)/alumina composites made with MWCNTs that have nanoscale defects on their surfaces from an acid treatment We conducted the fracture surface observations of the composites, in order to evaluate the effects of the acid treatment conditions of MWCNTs on the mechanical properties of the composites and the microstructures such as dispersibility and pullout length of MWCNTs. It was found that the dispersibiity of MWCNTs affected the mechanical properties of the composites. The composites with 0.9 vol.% MWCNTs that were acid-treated for 2 hours showed a higher mechanical properties than those of the composites with identical MWCNTs content that were acid-treated for 0, 0.5, 1, 3 and 4 hours. According to the SEM observations, the pullout length of MWCNTs decreased with increasing of acid treatment time of MWCNTs, and the diameter changed at the tip of some MWCNTs.
J0802-4-2 Investigation of Mechanical Properties of SOFC Electrolytes at High Temperature

KUSHI Takuto, WATANABE Satoshi, SATO Kazuhisa, IGUCHI Fumitada, UNEMOTO Atsushi, AMEZAWA Koji, HASHIDA Toshiyuki, YUGAMI Hiroo, KAWADA Tatsuya

2010　(7)　231-232　2010/09/04
Publisher: The Japan Society of Mechanical Engineers

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Elastic modulus of typical electrolyte materials for solid oxide fuel cells, (Gd_2O_3)_<0.05>(CeO_2)_<0.9>, (Y_20_3)_<0.08>(Zr0_2)_<0.92>, La_<0.8>Sr_<0.2>Ga_<0.8>Mg_<0.15>Co_<0.05>O_<3-δ>, were evaluated by resonance method, small punch test and 4 point bending test. The measurements were carried out from room temperature to 1273 K under p(O_2)=10^<-4> atm. Elastic modulus of (Y_20_3)_<0.08>(Zr0_2)_<0.92> and La_<0.8>Sr_<0.2>Ga_<0.8>Mg_<0.15>Cp_<0.05>O_<3-δ> drastically decreased in the temperature range between 573 K and 873 K in resonance method. Similar dependencies were seen in 4 point bending test and small punch test. It was found that that elastic modulus by dynamic (resonance method) shows similar temperature dependency as those by static (small punch and 4 point bending tests) measurement techniques, although its absolute values were slightly different. It was demonstrated that the dynamic measurement technique is very useful for evaluating mechanical properties of SOFC materials as well as static measurement techniques.
F203 CO_2 sorption characteristics of rocks and minerals for CO_2 geological storage

FUJII Takashi, NAKAGAWA Satomi, SATO Yoshiyuki, INOMATA Hiroshi, HASHIDA Toshiyuki

National Symposium on Power and Energy Systems　2010　(15)　465-468　2010/06/20
Publisher: The Japan Society of Mechanical Engineers

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CO_2 sorption experiments for Berea sandstone, Kimachi sandstone, shale, serpentine, granite, quartz, and albite were conducted using the gravimetric method under air dry conditions at 50℃ and 100℃, and pressures up to 20 MPa. In higher pressures (>10 MPa), Berea sandstone has shown a significantly higher sorption capacity compared to the other samples at both 50℃ and 100℃. It is also shown that the major component minerals for the rocks tested in this study (quartz and albite) have a CO_2 sorption behavior. Comparison of model prediction which assumes that the CO_2 storage capacity of the rock mass is equal to the amount of CO_2 used to fill the pore volume in the rock, suggests that the CO_2 sorption is an additional CO_2 storage mechanism in storing CO_2 process. The present results indicate that the CO_2 sorption characteristics may provide a significant and meaningful effect on the assessment of CO_2 storage potential in geological storage.
Small punch creep test of service-exposed SUS 316 HTB superheater tubes of fossil boilers

Maribel L. Saucedo-Muñoz, Shin Ichi Komazci, Toru Takahashi, Toshiyuki Hashida, Tetsuo Shoji, Victor M. Lopez-Hirata

TMS Annual Meeting　3　729-736　2010/05/21
断裂型貯留層を対象とした物質移動におけるNon‐Fickian挙動のキャラクタリゼーション

鈴木杏奈, 千葉隆一, 蒔田浩士, 新堀雄一, 橋田俊之

日本地熱学会学術講演会講演要旨集　2010　54　2010
S0305-3-1 Relationship between High Temperature Creep and Electrochemical Properties in CERIA-based Electrolytes

YUGAMI Hiroo, IGUCHI Fumitada, SATO Kazuhisa, HASHIDA Toshiyuki

The proceedings of the JSME annual meeting　2009　(1)　233-234　2009/09/12
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2009.1.0_233 　

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A creep test was performed on yttria doped ceria (YDC), which was investigated as an electrolyte for solid oxide fuel cells (SOFC). The test was performed using a 4-point bending method and with testing conditions including a constant load under a temperature range of 1050-1125℃, an applied stress of 20-50 MPa, and an oxygen partial pressure of P(O_2)=0.21-10^<-15.2> atm. The results showed that the creep rate increased with decreasing P(O_2), and showed a peak at P(O_2)=10^<-13.6> atm. The activation energy for creep was increased from 264 to 333 kJ/mol with decreasing P(O_2) from 0.21 to 10^<-14.5> atm. These values were much higher than the reported activation energy of oxygen anion diffusion in ceria. Thus, it could be suggested that the creep mechanism is controlled by cation diffusion. The creep mechanism changed from Nabarro-Herring creep to grain boundary sliding in a reducing atmosphere when the P(O_2) was lower than 10^<-14.5> atm.
OS0615 A Novel Structure for Carbon Nanotube Reinforced Alumina Composites

Yamamoto Go, Omori Mamoru, Aizawa Yoichi, Hashida Toshiyuki, Takagi Toshiyuki

2009　229-231　2009/07/24
Publisher: The Japan Society of Mechanical Engineers

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We report the mechanical properties of multi-walled carbon nanotube (MWCNT)/alumina composites made with a pristine MWCNT and an acid-treated version that have nanoscale defects on their surfaces from the acid treatment. Microstructural observations revealed that a homogeneous distribution of MWCNTs in the alumina matrix was achieved by a novel processing approach based on the precursor method for the synthesis of alumina and acid-treated MWCNTs. An interesting geometric structure was observed between individual MWCNT and alumina matrix. The nanodefect on the acid-treated MWCNT was filled up with alumina crystal, wiuich may be intruding into the nanodefect during grain growth The addition of only 0.9 voL% acid-treated MWCNTs to alumina resulted in 27% and 25% simultaneous increases in bending strength (689.6 ± 29.1 MPa) and fracture toughness (5.90 ± 0.27 MPam^<1/2>), respectively.
183 Effect of thickness of GDC electrolyte films on electrical performance of anode-supported SOFCs

Ding Changsheng, Tsutai Yoshifumi, Iguchi Mabito, Sato Kazuhisa, Hashida Toshiyuki

2009　(44)　160-161　2009/03/13
Publisher: The Japan Society of Mechanical Engineers
106 Investigation of Shear Crack Growth in Subsurface Rocks under Confining Pressures Using Epoxy Resin

YAMAGUCHI Hiroyuki, SAKAGUCHI Kiyotoshi, SATO Kazushi, MATSUKI Kohji, HASHIDA Toshiyuki

2009　(44)　12-13　2009/03/13
Publisher: The Japan Society of Mechanical Engineers
Tension-Softening Behavior in Rock due to Crack Overlapping

Sato Kazushi, Hashida Toshiyuki

45　9-16　2009/03
Publisher: Sendai National College of Technology
ISSN： 0286-3707
Evaluation Method for Mechanical Performance of Solid Oxide Fuel Cell under Simulated Operating Conditions

Kazuhisa Sato, Ken-ichi Fukui, Masayuki Numao, Toshiyuki Hashida, Junichiro Mizusaki

Proc. ASME 7th International Fuel Cell Science, Engineering and Technology Conference　671-676　2009

DOI： 10.1115/FuelCell2009-85238 　
Nanocomposite Prepared from Carbon Nanotubes and Hydroxyapatite Precursors

M. Omori, T. Watanabe, M. Tanaka, A. Okubo, H. Kimura, T. Hashida

Nano Biomedicine　1　(2)　137-142　2009

DOI： 10.11344/nano.1.137 　

ISSN： 1883-5198 2185-4734
GS0606 Effects of reducing treatment on mechanical properties of SOFC components

TAKEYAMA Yohei, SATO Kazuhisa, KAWADA Tatsuya, HASHIDA Toshiyuki, MIZUSAKI Junichiro

2008　"GS0606-1"-"GS0606-2"　2008/09/16
Publisher: The Japan Society of Mechanical Engineers
102 Nanostructured La_<0.6>Sr_<0.4>Co_<0.2>Fe_<0.8>O_<3-δ> powders via gel combustion for IT-SOFCs applications

Lin Hongfei, Ding Changsheng, Sato Kazuhisa, Tsutai Yoshifumi, Iguchi Mabito, Hashida Toshiyuki

2008　(43)　5-6　2008/03/15
Publisher: The Japan Society of Mechanical Engineers
101 Fabrication and characterization of ceria-based electrolyte thin films for anode-supported SOFCs

Ding Changsheng, Lin Hongfei, Sato Kazuhisa, Tsutai Yoshifumi, Iguchi Mabito, Hashida Toshiyuki

2008　(43)　3-4　2008/03/15
Publisher: The Japan Society of Mechanical Engineers
CNT-セラミックス複合材料

山本剛, 大森守, 橋田俊之

工業材料　56　(1)　10-11　2008
C231 Instability of Concentration Field at Gas-liquid Surface in the Process of Carbon Dioxide Absorption

Komiya Atsuki, Maruta Kaoru, Nakano Yoshikatsu, Hashida Toshiyuki

Procee[d]ings of Thermal Engineering Conference　2007　263-264　2007/11/23
Publisher: The Japan Society of Mechanical Engineers

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A study on the visualization of the absorption process in the vicinity of the gas-liquid interface was performed. The system in which CO_2 was absorbed into amine solvents and diffused toward the interior of liquid phase was visualized. The interferogram pattern obtained by phase shifting interferometer showed that the increasing of concentration field instability in liquid phase was observed as time advanced or pressure of the gas phase was increased. This was caused by the density increase of the amine absorbing CO_2 and the liquid was affected by the negative buoyant force which generated natural convection locally. Therefore, pseudo diffusion coefficient in this system was determined larger than that of the molecular diffusion system. It was considered that the self-generated instability enhanced the mass transfer of CO_2 in the vicinity of interface and liquid phase.
カーボンナノチューブを利用したセラミックス基複合材料の製造

山本剛, 大森守, 橋田俊之, 相沢養市, 大久保昭, 木村久道

ケミカルエンジニアリング特集=ライセンス技術の開拓と展望　52　(10)　1-5　2007/10
Publisher: 化学工業社
110 Numerical Simulation of non-Fickian Diffusion in a Fractured Porous Aquifer

CHIBA Ryuichi, FOMIN Sergei, CHUGUNOV Vladimir, NIIBORI Yuichi, HASHIDA Toshiyuki

2007　(42)　21-22　2007/03/13
Publisher: The Japan Society of Mechanical Engineers
195 Numerical simulation of CO_2 injection for CO_2 geological sequestration

Sasaki Kenta, Fujii Takashi, Niibori Yuichi, Ito Takatoshi, Hashida Toshiyuki

2007　(42)　187-188　2007/03/13
Publisher: The Japan Society of Mechanical Engineers
Influence of convection in the vicinity of surface upon carbon dioxide absorption in solution

Komiya Atsuki, Maruta Kaoru, Nakano Yoshikatsu, Hashida Toshiyuki

2007　175-175　2007
Publisher: 日本流体力学会

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The absorption process in the vicinity of the gas-liquid interface was visualized in the system where CO_2 was absorbed into amine solvents and diffused toward the interior of liquid phase. From the interferogram obtained by phase shifting interferometer, the increasing of concentration field instability in the liquid phase was observed as time advanced or pressure of the gas phase was increased. This was because the density of the amine absorbing CO_2 increased and the liquid was affected by the gravitational force. Therefore, pseudo diffusion coefficient was obtained larger than that of the molecular diffusing system. It was considered that the self-generated instability enhanced the mass transfer of CO_2 in the vicinity of interface and liquid phase.
製品中アスベストの現場簡易判別技術の開発 Invited

尾家慶彦, 橋田俊之

東北大学環境報告書　54-54　2007
カーボンナノチューブを利用したセラミックス基複合材料の製造

山本剛, 大森守, 橋田俊之, 相澤養市, 大久保昭, 木村久道

ケミカルエンジニヤリング,（特集ライセンス技術の開拓と展望）　52　(10)　743-747　2007
Publisher: 化学工業社
ISSN： 0387-1037
アスベストの有無を、簡単に、短時間で探知できるオンサイト技術

尾家慶彦, 前田直己, 橋田俊之

OHM　10　12-13　2007
断裂型岩体を対象としたCO_2地中圧入の数値シミュレーションに関する研究

佐々木健太, 藤井孝志, 新堀雄一, 橋田俊之

春季大会講演集. I, 資源編　18　(2)　3-4　2006/03/27

ISSN： 1343-9898
512 Dissolution characteristics of rock minerals in CO_2 for CO_2 underground

FUJII Takashi, TAKISAWA Reisuke, LIN Hongfei, SASAKI Kenta, TAKAHASHI Toru, HASHIDA Toshiyuki

2006　(41)　215-216　2006/03/14
Publisher: The Japan Society of Mechanical Engineers
121 Numerical Simulation of Flow Dynamics for CO_2 Injection into Rock Masses

SASAKI Kenta, FUJII Takashi, NIIBORI Yuichi, HASHIDA Toshiyuki

2006　(41)　47-48　2006/03/14
Publisher: The Japan Society of Mechanical Engineers
518 Mechanical Properties of Multi-Walled Carbon Nanotube/SiC Composites Prepared by Direct Thermal Decomposition of Polycarbosilane Precursor

YOKOMIZO Kenji, YAMAMOTO Go, OMORI Mamoru, TAKAHASHI Toru, HASHIDA Toshiyuki

2006　(41)　227-228　2006/03/14
Publisher: The Japan Society of Mechanical Engineers
PMC-10: Effects of Polycarbosilane Addition on the Mechanical Properties of Single-Walled Carbon Nanotube Solids(PMC-II: POLYMERS AND POLYMER MATRIX COMPOSITES)

YAMAMOTO G., OMORI M., SATO Y., TAKAHASHI T., TOHJI K., HASHIDA T.

JSME Materials and Processing Conference (M&P)　2005　5-6　2005/06/19
Publisher: The Japan Society of Mechanical Engineers
209 Development of Simple Predictive Model of Hydraulically-induced Reservoir Growth for Geothermal Energy Extraction

YOSHIDA Kei, FOMIN Sergei, HASHIDA Toshiyuki

2005　(40)　68-69　2005/03/15
Publisher: The Japan Society of Mechanical Engineers
213 Fracture Behavior of Ceria-based SOFCs under Simulated Operating Conditions

OMURA Hajime, SATO Kazuhisa, HASHIDA Toshiyuki, YUGAMI Hiroo, YASHIRO Keiji, KAWADA Tatsuya, MIZUSAKI Junichiro

2005　(40)　76-77　2005/03/15
Publisher: The Japan Society of Mechanical Engineers
214 Prediction of Elastic Modulus of Ceria based Ceramic Composites for SOFCs by Molecular Dynamics

SATO Kazuhisa, SUZUKI Ken, HASHIDA Toshiyuki, YUGAMI Hiroo, KAWADA Tatsuya, MIZUSAKI Junichiro

2005　(40)　78-79　2005/03/15
Publisher: The Japan Society of Mechanical Engineers
Mechanical Damage Evaluation of Solid Oxide Fuel Cells under Simulated Operationing Conditions

Kazuhisa Sato, Toshiyuki Hashida, Keiji Yashiro, Hiroo Yugami, Tatsuya Kawada, Junichiro Mizusaki

Journal of Ceramic Society of Japan　113　(1320)　562-564　2005

DOI： 10.2109/jcersj.113.562 　

ISSN： 0914-5400 1882-1022
Development of performance evaluation testing method for SOFC

K. Sato, H. Omura, T. Hashida, K. Yashiro, T. Kawada, J. Mizusaki, H. Yugami, A. Atkinson

Proceedings - Electrochemical Society　PV 2004-16　170-176　2004/12/01
Time Dependency of Permeability and the Effect of Supercritical Water-Induced Microcrack in Granite

TAKAHASHI T., TAKIZAWA S., HASHIDA T.

2004　A23　2004/11/20
Numerical Analysis for Unsteady Sate Growth Behavior of Hydraulically-Imduced Reservoirs

YOSHIDA K., FOMIN S., HASHIDA T.

2004　A24　2004/11/20
Relationship between defect structures and mechanical properties on solid electrolytes of SOFC

Ishida Tomotaka, Iguchi Fumitada, Yugami Hiroo, Sato Kazuhisa, Hashida Toshiyuki

2004　(40)　37-38　2004/09/17
Publisher: The Japan Society of Mechanical Engineers
High Temperature Mechanical Properties of Ceria-based Ceramics Determined by Small Punch Testing Method

MORITO Akira, OMURA Hajime, SATO Kazuhisa, YUGAMI Hiroo, OMORI Mamoru, HASHIDA Toshiyuki

2004　(40)　39-40　2004/09/17
Publisher: The Japan Society of Mechanical Engineers
216 Mechanical Properties of Single-Walled Carbon Nanotube Solids Prepared by Spark Plasm Sintering

YAMAMOTO Go, SATO Yoshinori, TAKAHASHI Toru, OHMORI Mamoru, TOHJI Kazuyuki, HASHIDA Toshiyuki

2004　(39)　76-77　2004/03/13
Publisher: The Japan Society of Mechanical Engineers
213 Mechanical and Electrical properties of Ceria based Ceramics Electrolytes for Solid Oxide Fuel Cells under High Temperature Condition

SATO Kazuhisa, YUGAMI Hiroo, HASHIDA Toshiyuki

2004　(39)　70-71　2004/03/13
Publisher: The Japan Society of Mechanical Engineers
217 Relationship between defect structures and mechanical properties on doped Ceria oxides

Ishida Tomotaka, Iguchi Fumitada, Yugami Hiroo, Sato Kazuhisa, Hashida Toshiyuki

2004　(39)　78-79　2004/03/13
Publisher: The Japan Society of Mechanical Engineers
Geothermal Energy

HASHIDA Toshiyuki

Journal of the Japan Society of Mechanical Engineers　107　(1023)　110-112　2004/02/05
Publisher: The Japan Society of Mechanical Engineers
ISSN： 0021-4728
Tissue reaction to nanotube, nanoparticle, and microparticle, and their biological application. Application of carbon nanotube to biomaterial.

横山敦郎, 山本悟, 赤坂司, 古月文志, 佐藤義倫, 田路和幸, 小野木伯薫, 橋田俊之, 大森守

ナノチューブ、ナノ微粒子、マイクロ微粒子の組織反応性とバイオ応用平成15年度総括・分担研究報告書　2004
Research of the Water Injection into the Rock Under High Temperature and High Pressure Water Conditions

CHIBA R., TAKASHIMA Y., ITO T., HAYASHI K., HASHIDA T.

2003　P03　2003/11/20
Temperature and Granite Type Dependency of Permeability and Hydrothermally Induced Microcracking

TAKIZAWA S., TAKAHASHI T., HASHIDA T.

2003　89-89　2003/11/20
Numerical Simulation of Thermal Extraction from Multiple-Borehole Geothermal Systems

YOSHIDA K., FOMIN S., HASHIDA T.

2003　92-92　2003/11/20
Preparation of Hydroxyapatite at Low Temperature by SPS

OMORI Mamoru, OKUBO Akira, HASHIDA Toshiyuki, ONOKI Takamasa

Materials and processing conference　2003　(11)　361-362　2003/10/17
Publisher: The Japan Society of Mechanical Engineers

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Hydroxyapatite (Ca_<10>(PO_4_6(OH_2,HA) is a bioactive material and is synthesized by four kinds of methods. The spark plasma system (SPS) is a promising method to produce advanced materials. Sintering and some chemical reactions are enhanced by SPS. This paper is concerned about the HA synthesis from the mixture of 6CaHPO_42H_2O and 4Ca(OH)_2by SPS. These two compounds are dehydrated under 600℃ and the mixture is turned into the composition of HA. Small crystals of HA were prepared without pressure at 600℃ by heating, but they were decomposed at this temperature for extended times or at higher temperatures. On the other hand, SPS enabled to form stable HA crystals at 600℃, and this growth was based on an effect of SPS. The HA formation was performed at 1000℃ at the high pressure such as 120 MPa. The high pressure of SPS could promote the crystal growth and the stability of HA compared with the decomposition products of HA.
Application of the small-punch test on the evaluation of cryogenic toughness of isothermally aged austenitic stainless steels

M. L. Saucedo-Muñoz, M. L, Saucedo-Muñoz, S. I. Komazaki, T. Hashida, T. Shoji, V. M. López-Hirata

Revista de Metalurgia (Madrid)　39　378-386　2003/09/01

ISSN： 0034-8570
Fracture Characteristics and Hydraulic Fracturing behavior in Granite under Supercritical Water Conditions

HASHIMOTO Kenji, TAKAHASHI Toru, HASHIDA Toshiyuki

2002　(37)　84-85　2002/03/16
Publisher: The Japan Society of Mechanical Engineers
Interaction between granite and supercritical water for geothermal extraction from deep-seated rock masses

Fujii Yasushi, TANIFUJI Koji, TAKIZAWA Shinichi, HASHIDA Toshiyuki

2002　(37)　86-87　2002/03/16
Publisher: The Japan Society of Mechanical Engineers
Numerical Simulation of Crack Growth in Rock under Compression Stress Field Using Embedded Crack Element

ITAOKA Mikiyo, SATO Kazushi, HASHIDA Toshiyuki

2002　(37)　90-91　2002/03/16
Publisher: The Japan Society of Mechanical Engineers
Processing and Evaluation of Hydroxyapatite Ceramics with Lamellar Structure by Hydrothermal Hot Pressing from Octacalcium Phosphate

LI Junguo, ONOKI Takamasa, LIU Li hui, HASHIDA Toshiyuki

2002　(37)　102-103　2002/03/16
Publisher: The Japan Society of Mechanical Engineers

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In this study, we prepared hydroxyapatite ceramics at 300℃ by hydrothermal hot pressing using octacalcium phosphate as the starting material. The phase and microstructure of the solidified body were determined by X-ray diffraction and scanning electron microscopy. The Vickers's hardness, bending strength and fracture toughness were measured by micro-hardness test and 3-point-bending test, respectively. The results show that c axis of hydroxyapatite crystal points to the direction normal to the load that applied during hydrothermal hot pressing. The grains are sheet and stack up to a clamshell structure along the direction the load direction. According to the microstructure, the mechanical properties of the HAp ceramics appear strong anisotropy. The bending strength and fracture toughness tested on the side normal to the load direction reach 39.6MPa and 1.34MPam^<1/2>, respectively.
Effects of alkali solution on hydroxyapatite ceramics-metal interface toughness produced by hydrothermal hot-pressing method

Onoki Takamasa, Hosoi Kazuyuki, Hashida Toshiyuki

2002　(37)　110-111　2002/03/16
Publisher: The Japan Society of Mechanical Engineers
Fracture Characteristics of Thermal Barrier Coating in Tension and Bending Tests

TONOMORI Tetsuro, YOSHIDA Akira, HASHIDA Toshiyuki

2002　(37)　112-113　2002/03/16
Publisher: The Japan Society of Mechanical Engineers
Influence of Thermal Aging on Interface Strength of Thermal Barrier Coatings

ONOKI Takamasa, TONOMORI Tetsuro, OGAWA Kazuhiro, HASHIDA Toshiyuki, SHOJI Tetsuo, MARUYAMA Masahide, TOGASHI Hiroyuki, TORIGOE Taiji

The proceedings of the JSME annual meeting　2002　(0)　225-226　2002
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2002.2.0_225 　

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Knowledge of the degradation mode in thermal barrier coatings (TBCs) is a prerequisite for the prediction of their remaining life of gas turbine blades. This paper describes the effects of thermal aging on the microstructure in a YSZ-based thermal barrier coating system deposited on Ni based superalloy substrates. The heat treatment of the TBC specimens were conducted at 1373K for 100h, 500h and 1000h in air for thermal aging. The thermally aged coating system had thermally grown oxide (TGO) layer between the substrate and the TBC. TGO consisted of not only alumina but also other oxides. This oxide layer that named mixed oxides (MO) is composed of Ni, Co, Cr and O. 4 point bending tests were carried out in order to evaluate the TBC/substrate interface strength. The interface strength depended on the period of thermal aging in both type of tests. The interface strength increased initially up to the aging time of 100h, and then decreased drastically for the longer aging time. In 4 point bending tests, crack propagated along the interface between TBC and substrate. These results suggested that the interface strength depended on not only the formation of oxides but also the fracture properties of the top coatings.
Numerical Simulation of Heat Extraction Performance of Artificial Reservoirs with Multi-Borehole System

YOSHIDA K., SHIMIZU A., FOMIN S., HASHIDA T.

2001　A47　2001/12/01
Microcrack generation and permeability increase in granite under supercritical water conditions

TANIFUJI K., TAKAHASHI T., FUJII Y., TAKASHIMA Y., STAFFORD C., HASHIDA T.

2001　A46　2001/12/01
水熱ホットプレス法による低温焼結成型の可能性

白川昭裕, 関根孝太郎, 細井和幸, 平野伸夫, 小田幸人, 土屋範義, 橋田俊之, 中塚勝人, 山崎仲道

日本学術会議材料研究連合講演会講演論文集　45th　163-164　2001/09/18
水熱法による二酸化炭素からの有機化合物への直接合成

山崎仲道, 橋田俊之, 劉麗輝, 鎌倉高広

一般発表(研究・業績発表)講演要旨集　2001　(2)　136-137　2001/03/01

ISSN： 0919-293X
大深部岩体における水圧破砕き裂進展挙動の数値シミュレーションに関する研究

板岡幹世, 佐藤一志, 橋田俊之

資源・素材　2000　(1)　121-122　2000/10/03

ISSN： 0919-7915
超臨界水環境下における花こう岩ののせん断破壞挙動に関する研究

高橋亨, 橋本健嗣, 橋田俊之

資源・素材　2000　(1)　142-143　2000/10/03

ISSN： 0919-7915
Permeability of a Granite under Supercritical Water Conditions

TAKAHASHI T., TANIFUJI K., HASHIDA T.

2000　2000/01/20
Numerical Analysis of Hydraulically Induced Fracture Propagation Process in Deep Seated Rock Mass

ITAOKA M., SATO K., HASHIDA T.

2000　2000/01/20
Numerical simulation of the expansion of hydraulically induced geothermal reservoir and the increase of heat extraction by stimulation

SHIMIZU A., WATANABE K., HASHIDA T.

2000　2000/01/20
小型パンチ試験法によるボイラ用耐熱鋼のクリープ特性劣化計測

駒崎慎一, 橋田俊之, 庄子哲雄, 鈴木康吏

高温強度シンポジウム前刷集　37th　76-80　1999/12/02
Study on Mechanisms of Degradation in Thermal Barrier Coatings.

小川和洋, 庄子哲雄, 橋田俊之, 青木久彦, 藤田範生, 鳥越泰治

日本機械学会材料力学部門講演会講演論文集　1999　559-560　1999/10/05
A Study on Fractured Reservoir by Stimulation

SHIMIZU A., WATANABE K., HASHIDA T.

21　(1)　52-52　1999/01/25

ISSN： 0388-6735
Influence of High Temperature Oxidation on Interfacial Fracture in Thermal Barrier Coatings.

HA J, 橋田俊之, 庄子哲雄, 河合久孝, 佐藤実, 橋本英雄

日本機械学会通常総会講演会講演論文集　75th　(2)　652-653　1998/03
短繊維強化複合材料の破壊挙動に及ぼすマルチプルクラックの影響

佐藤一志, 高橋亭, 橋田俊之

宮城工業高等専門学校研究紀要　(34)　1-6　1998
Publisher: 宮城工業高等専門学校
ISSN： 0286-3707
Application of Pressurized Carbon Dioxide to Drying Process of Wood

T. Kono, H. Shinohara, H. Takahashi, T. Shoji, T. Hashida, N. Yamasaki

Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu　7　1420-1422　1998/01/01
Publisher: The Japan Society of High Pressure Science and Technology
DOI： 10.4131/jshpreview.7.1420 　

ISSN： 0917-639X
Sensational Evaluation of colored Sugi from cut end by air pressure and vacuum process under hydrothermal condition.

篠原速都, 河野敏夫, 山崎仲道, 橋田俊之, 庄子哲雄

水熱化学実験所報告　8　(14/17)　71-78　1997/12
Publisher: 高知大学理学部附属水熱化学実験所
ISSN： 0389-4630
水熱ホットプレス法を用いた炭酸カルシウム複合体の低温固化技術の開発とその高機能化

細井和幸, 橋田俊之, 庄子哲雄

水熱化学実験所報告　8　(14)　91-106　1997/12
Publisher: 高知大学理学部附属水熱化学実験所
ISSN： 0389-4630
A New 3-D Network Model for HWR Geothermal Reservoir in Fractured Basement

JING Z., WILLIS-RICHARDS J., WATANABE K., HASHIDA T.

19　(2)　128-128　1997/04/25

ISSN： 0388-6735
Estimation of Geothermal Energy Extraction Using Fractal Fracture Network Model

CHIGIRA N., WILLIS-RICHARDS J., WATANABE K., HASHIDA T.

19　(2)　141-141　1997/04/25

ISSN： 0388-6735
Characterization of Fractured Geothermal Reservoir Based on Fractal Geometry

SHIMIZU A., WATANABE K., TATENO M., HASHIDA T.

19　(2)　140-141　1997/04/25

ISSN： 0388-6735
The Effect of Temperature and Surface Velocity on Water/Rock Interaction Under Reservoir Condition

TANIFUJI K., SUDO Y., WATANABE K., HASHIDA T.

19　(2)　140-140　1997/04/25

ISSN： 0388-6735
Coloring of cedar wood by the butt end impregnation hydrothermal method.

篠原速都, 河野敏夫, 山崎仲道, 庄子哲雄, 橋田俊之

日本木材学会大会研究発表要旨集　47th　313　1997/03

ISSN： 0549-3994
Evaluation of Distributed Microcracking Behavior in Rock Using Acoustic Emission.

高橋亨, 佐藤一志, 橋田俊之, 高橋秀明, 庄子哲雄

日本機械学会東北支部総会・講演会講演論文集　32nd　157-158　1997/02
Solidification of light-weight concrete waste by CO2 hardening method and toughening by short fiber reinforcements.

HA J, 橋田俊之, 高橋秀明, 庄子哲雄, 寺村敏史

日本機械学会東北支部総会・講演会講演論文集　32nd　161-162　1997/02
Thermal fatigue resistance of ceramic thermal barrier coating systems for gas turbine blades.

里見嘉保, 橋田俊之, 高橋秀明, 庄子哲雄

日本機械学会東北支部総会・講演会講演論文集　32nd　159-160　1997/02
327 高圧下での炭酸硬化反応による木材と炭酸カルシウムの複合化

河野敏夫, 篠原速都, 山崎仲道, 高橋秀明, 庄子哲雄, 橋田俊之, 吉永秀人

学術講演会講演論文集　45　185-186　1996
Publisher: 日本材料学会
岩石の破壊靭性評価システムの開発

多田周二, 橋田俊之

東北工業技術試験所報告　(24)　p43-48　1991/02
Publisher: 東北工業技術試験所
ISSN： 0389-939X
FRACTURE TOUGHNESS DETERMINATION OF MORTAR BY USE OF BREAKOFF TESTER

KOBAYASHI SHINICHI

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. Materials and construction, fire safety, off-shore engineering and architecture, computer application　62　89-90　1987/08/25
Publisher: Architectural Institute of Japan
ISSN： 0285-7634
Simulation of the Extension Behavior of a Hydraulically Induced Crack by Use of Brittle Epoxy Specimens

HASHIDA Toshiyuki, SHOJI Tetsuo, MURAMATSU Masahiro

JSME international journal : bulletin of the JSME　30　(262)　682-682　1987/04
Publisher: The Japan Society of Mechanical Engineers
ISSN： 0913-185X
花こう岩の混合負荷(開口型およびせん断型)における破壊発生条件

和田千春, 橋田俊之, 庄子哲雄, 玉川きん治, 高橋秀明

日本鉱業会研究業績発表講演会講演要旨集　1982　121-122　1982/04
花こう岩の高温高圧水中における溶解挙動

橋田俊之, 池谷利彦, 庄子哲雄, 高橋秀明

日本鉱業会研究業績発表講演会講演要旨集　1982　105-106　1982/04

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Books and Other Publications 17

セルロースナノファイバー(CNF)による蓄電体の開発 -アモルファスセルロースナノファイバーを利用して創成した物理（量子）的蓄電体-

福原幹夫, 長谷川史彦, 橋田俊之, 藤間信久, 武田光博, 中谷丈史, 森田昌浩

株式会社シーエムシー出版　2022/03
全固体電池の界面抵抗低減と作製プロセス、評価技術

佐藤一永, 橋田俊之

技術情報協会　2020/03

ISBN: 9784861047800
Mechanical and Fracture Properties of Carbon Nanotubes, Chapter 6 of Carbon Nantubes

Keiichi Shirasu, Go Yamamoto, Daniel Nelias, Toshiyuki Hashida

IntechOpen　2018/04

ISBN: 9781789230536

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Chapter 6 of Carbon Nantubes, edited by Mohammes Muzibur Rahman
Topical Themes in Energy and Resources, A Cross-Disciplinary Education and Training Program for Environmental Leaders

T. Hashida

Springer　2015
高分子における劣化・破壊現象の写真・データ事例集～原因特定と対策のために～

山本剛, 白須圭一, 野坂陽, 橋田俊之

技術情報協会　2014
エレクトロニクス用途におけるコンポジット材料の混練・コンパウンド技術と分散・界面制御

山本剛, 白須圭一, 橋田俊之

技術情報協会　2013/04
Composites and Their Properties

Go Yamamoto, Toshiyuki Hashida

InTech　2012

DOI： 10.5772/48667 　

ISBN: 9789535107118
Mega-scale fluid flow in complex subsurface systems, in Nano-Mega Scale Flow Dynamics in Energy Systems, The 21st Century COE Program International COE of Flow Dynamics Lecture Series, Volume 9

Toshiyuki Hashida, Ryuichi Chiba, Sergei Fomin

Tohoku University Press　2008/04

ISBN: 9784861630941
Mathematical Modeling of Mass Transport in Complex Media, The 21st Century COE Program International COE of Flow Dynamics Lecture Series, Volume 7

Shigenao Maruyama, Toshiyuki Hashida

Tohoku University Press　2008/04

ISBN: 9784861630798
The Earth Simulator, The 21st Century COE Program International COE of Flow Dynamics Lecture Series, Volume 8

Shigenao Maruyama, Toshiyuki Hashida

Tohoku University Press　2008/04

ISBN: 9784861630804
水その不思議な世界 –私たちの星を守るために-

橋田俊之

高知新聞社　2007/11/23
JSME Mechanical Engineers' Handbook, Fundamentals, α3: Materials and Mechanics

Toshiyuki Hashida

JSME　2005/04/25
水熱化学ハンドブック

Toshiyuki Hashida

1997/07
金属デ-タブック改訂３版

Toshiyuki Hashida

1993/03
傾斜機能材料

高橋秀明, 橋田俊之

1993/02/15
傾斜機能材料

庄子哲雄, 高橋秀明, 橋田俊之他

1993/02
岩石破壊力学とその応用

西松裕一

1989/05

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Presentations 81

Radial growth kinetics of epitaxial pyrolytic carbon layers on carbon nanotube surfaces by non-catalytic pyrolysis

Fan Liu, Naoto Nishioka, Keiichi Shirasu, Fumio Ogawa, Toshiyuki Hashida

31st International Conference on Diamond and Carbon Materials　2021/09/07
酸化物型全固体電池の正極構成材料を目的とした作製と評価

柳田航輝, 吉田尚生, 佐藤一永, 橋田俊之

日本機械学会 2021年度年次大会　2021/09/07
持続的地熱開発のための還元に伴う温度履歴を活用した貯留層評価に関する基礎的研究

山口碧, 鈴木杏奈, Elvar K. Bjarkason, 今野恵, 橋田俊之

日本機械学会東北支部第56期総会・講演会　2021/03/12
窒化ケイ素セラミックスの開発を目的とした非酸化物焼結助剤の創製と焼結体の評価

鈴木貴晴, 奥山千雅, 橋田俊之

日本機械学会東北支部第56期総会・講演会　2021/03/12
非酸化物焼結助剤の創成と窒化ケイ素セラミックスの機械的特性に及ぼす影響に関する研究

奥山千雅, 鈴木貴晴, 橋田俊之

日本機械学会東北支部第51回卒業研究発表講演会　2021/03/09
CNT紡績糸の作製とその特性評価に関する研究

土井慎平, 小川文男, 橋田俊之

日本機械学会東北支部第51回卒業研究発表講演会　2021/03/09
多層カーボンナノチューブの炭素含浸/アニール処理と構造・特性評価に関する研究

西岡尚人, 劉凡, 小川文男, 橋田俊之

日本機械学会東北支部第51回卒業研究発表講演会　2021/03/09
多層カーボンナノチューブのナノ構造制御を目的とした作製と評価に関する研究

高橋良典, 白須圭一, 高橋和彦, 橋田俊之

日本機械学会東北学生会第50回卒業研究発表講演会　2021/03/06
薄膜型全固体リチウムイオン電池の創製を目的とした酸化物固体電解質の作製と評価に関する研究

大内康弘, 吉田尚生, 佐藤一永, 橋田俊之

日本機械学会東北支部第55期総会・講演会　2020/03/13
テラヘルツ分光法と機械学習を組み合わせた全固体酸化物電池の内部損傷可視化法の開発

薮田佳絵, 佐藤一永, 金森義明, 福井健一, 沼尾正行, 橋田俊之

日本機械学会東北支部第55期総会・講演会　2020/03/13
改良４点曲げ試験法を用いた模擬作動環境下におけるSOFC電極/電解質間の界面破壊特性評価

NAJMAN HELMI BIN JAAFAR, 熊田圭悟, 佐藤一永, 橋田俊之

日本機械学会東北学生会第50回卒業研究発表講演会　2020/03/06
Molecular dynamic simulations of deformation and strength in multi-walled carbon nanotubes

北山駿介, 白須圭一, 高橋和彦, 橋田俊之

2020/03/06
スモールパンチ法を用いた固体酸化物年長電池構成材料のクリープ特性評価に関する研究

進藤有悟, 黄怡暉, 熊田圭悟, 佐藤一永, 橋田俊之

日本機械学会東北学生会第50回卒業研究発表講演会　2020/03/06
酸化物型全固体電池における正極特性の向上を目的とした作製・評価に関する研究

柳田航輝, 吉田尚生, 佐藤一永, 橋田俊之

日本機械学会東北学生会第50回卒業研究発表講演会　2020/03/06
Cosα法を用いた燃料極支持型固体酸化物燃料電池の電解質薄膜内残留応力の評価

熊田圭悟, 佐藤一永, 橋田俊之

日本機械学会2019年度年次大会　2019/09/10
全固体リチウムイオン電池の創成を目的とした固体電解質の作製と評価に関する研究

大内康弘, 吉田尚生, 佐藤一永, 橋田俊之

日本機械学会2019年度年次大会　2019/09/10
テラヘルツ分光法に基づく固体酸化物燃料電池の自動非破壊検査システム開発に関する研究

薮田佳絵, 福井健一, 沼尾正行, 佐藤一永, 橋田俊之

日本機械学会2019年度年次大会　2019/09/10
水潤滑環境下におけるCNT/アルミナ複合材料の摩擦摩耗特性に及ぼすCNT表面修飾の影響に関する研究

白須圭一, 宮浦拓人, 山本剛, 橋田俊之

日本機械学会第26回機械材料・材料加工技術講演会（M&P2018　2018/11/03
Significance of Nano-Scale Experimental Techniques for Development of Carbon Nanotube Reinforced Ceramics Matrix Composites International-presentation

8th International Symposium on Advanced Science and Technology in Experimental Mechanics,　2013/11/03
カーボンナノチュブを用いたセラミックス基複合材料の開発と応用展開

山本剛, 白須圭一, 野坂陽, 橋田俊之

第1回カーボンナノチューブコンポジットワークショップ（主催：JST 先端的低炭素化技術開発「現実的CNTアプリケーション技術による革新的超軽量強化複合材料量産化技術の開発」プロジェクト）　2013/08/29
カーボンナノチューブ/アルミナ複合材料の作製とその機械・電気的特性評価

橋田俊之, 山本剛, 白須圭一, 大森守, 小野崇人, 高木敏行

平成２５年度第１回カーボンナノ材料研究会（主催：（財）大阪科学技術センター）　2013/06/05
Investigation of Fracture Mechanism in Carbon Nanotube Reinforced Alumina Composites and Its Relation with Nanostructure International-presentation

Keiichi Shirasu, Go Yamamoto, You Nozaka, Mamoru Omori, Toshiyuki Takagi, Toshiyuki Hashida

Eighth International Conference on Flow Dynamics (ICFD2011)　2011/11/09
Effect of carbon nanotube addition on tribological behavior of carbon nanotube/alumina composites in dry and humid conditions International-presentation

G. Yamamoto, K. Shirasu, T. Takagi, T. Hashida

22nd European Conference on Diamond, Diamond‐Like Materials,Carbon Nanotubes and Nitrides　2011/09/04
Carbon Nantube-Alumina Composite in Total Joint Replacement International-presentation

Mamoru Omori, Go Yamamoto, Toshiyuki Hashida

The 3rd International Symposium on Surface and Interface of Biomaterials in conjunction with The 5th Annual Meeting of the Biomedical Society　2011/07/12
Fabrication of Yttria-stabilized Zirconia Film Under Room Temperature Condition International-presentation

Kazuhisa Sato, Keiji Yashiro, Junichiro Mizusaki, Toshiyuki Hashida

ICMAT 2011　2011/06/26
In situ Observation of Deformation and Mechanical damage of SOFC Cell/stack International-presentation

Kazuhisa Sato, Tadashi Sakamoto, Atsushi Kaimai, Keiji Yashiro, Koji Amezawa, Toshiyuki Hashida, Junichiro Mizusaki, Tastuya Kawada

219th ECS meeting　2011/06/01
The Effects of Oxygen Vacancy Concentration on the Mechanical Properties of Zirconia and Ceria-Based Electrolytes for SOFCs International-presentation

Toshiyuki Hashida, Yohei Takeyama, Kazuhisa Sato

The 7th International Conference on Fuel Cell Science, Engineering and Technology -FUELCELL2009　2009/06/08
SOFCの信頼性向上のための材料強度学的研究

第５１回固体イオニクス研究会（固体イオニクス学会主催）　2009/03/19
Evaluation of CO2 sorption capacity of rocks using a gravimetric method for CO2 geological sequestration International-presentation

Takashi Fujii, Yoshiyuki Sato, Hongfei Lin, Hiroshi Inomata, Toshiyuki Hashida

Th e 9 t h I n t e r n a t i o n a l C o n f e r e n c e o n G r e e n h o u s e G a s C o n t r o l T e c h n o l o g i e s ( G H G T - 9 )　2008/11/16
Numerical solution of fractional advection-dispersion equation into fractured porous aquifer International-presentation

Ryuichi Chiba, Sergei Fomin, Vladimir Chugunov, Yuichi Niibori, Toshiyuki Hashida

5th Joint ASME/JSME Fluids Engineering Conference　2007/07/30

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Ryuichi Chiba, Sergei Fomin, Vladimir Chugunov, Yuichi Niibori, Toshiyuki Hashida, Numerical solution of fractional advection-dispersion equation into fractured porous aquifer, 5th Joint ASME/JSME Fluids Engineering Conference, (San Diego, California, USA, July 30 - August 2, 2007), Presentation No. FEDSM2007-37692 (2007).
CO2地下貯留のためのCO2圧入挙動の数値シミュレーションに関する研究

佐々木健太, 藤井孝志, 新堀雄一, 伊藤高敏, 橋田俊之

日本機械学会東北支部第42期総会・講演会　2007/03/13

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佐々木健太，藤井孝志，新堀雄一，伊藤高敏，橋田俊之, CO2地下貯留のためのCO2圧入挙動の数値シミュレーションに関する研究, 日本機械学会東北支部第42期総会・講演会講演論文集No. 2007-1（平成19年3月13日，東北大学工学部青葉記念会館），(2007),pp.187-188. Kenta SASAKI, Takashi FUJII, Yuuichi NIIBORI, Takatoshi ITO, Toshiyuki HASHIDA, Numerical simulation of CO2 injection for CO2 geological sequestration, Proceedings of the 2007 Annual Meeting of JSME Tohoku Regional Division, 2007-1, (March 13th, 2007, Tohoku University, Sendai), (2007), pp.187-188.
非整数階微分を利用した地殻内流動の数値シミュレーション法開発

千葉隆一, Sergei Fomin, Vladimir Chugunov, 新堀雄一, 橋田俊之

日本機械学会東北支部第42期総会・講演会　2007/03/13

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千葉隆一，Sergei Fomin, Vladimir Chugunov,新堀雄一，橋田俊之,非整数階微分を利用した地殻内流動の数値シミュレーション法開発，日本機械学会東北支部第42期総会・講演会講演論文集No. 2007-1（平成19年3月13日，東北大学工学部青葉記念会館），(2007), pp.21-22. Ryuichi Chiba, Sergei Fomin, Vladimir Chugunov, Yuichi Niibori, and Toshiyuki Hashida, Numerical Simulation of Non-Fickian Diffusion in a Fractured Porous Aquifer, Proceedings of the 2007 Annual Meeting of JSME Tohoku Regional Division, 2007-1, (March 13th, 2007, Tohoku University, Sendai), (2007), pp. 21-22.
急速起動可能な固体酸化物燃料電池の概念設計と試作

熊田圭悟, 佐藤一永, 橋田俊之, 水崎純一郎

日本機械学会東北支部第37回学生員卒業研究発表講演会　2007/03/05

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熊田圭悟，佐藤一永，橋田俊之，水崎純一郎，急速起動可能な固体酸化物燃料電池の概念設計と試作，日本機械学会東北支部第37回学生員卒業研究発表講演会，（2007年3月5日，弘前大学）, (2007),pp.33-34 (講演番号203)． Keigo Kumada, Kazuhisa Sato, Toshiyuki Hashida, and Junichiro Mizusaki, Conceptual Design and Fbrication of Quich Start-up Solid Fuel Cells, Proceedings of the 2007 Annual Meeting of JSME Tohoku Regional Student Division, March 5, 2007, Hirosaki University, (2007), pp.33-34 (Presentation No. 203).
人工地熱貯留層からの抽熱性能に及ぼす天然き裂密度の影響に関する研究

千坂恒浩, 吉田敬, 橋田俊之

日本機械学会東北支部第37回学生員卒業研究発表講演会　2007/03/05

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千坂恒浩,吉田敬，橋田俊之，人工地熱貯留層からの抽熱性能に及ぼす天然き裂密度の影響に関する研究，日本機械学会東北支部第37回学生員卒業研究発表講演会，（2007年3月5日，弘前大学）, (2007),pp.35-36 (講演番号204)． Tsunehiro Chisaka, Kei Yoshida, and Toshiyuki Hashida, Effetcs of Natural Fracture Densities on the Thermal Extraction Performance of Engineered Geothermal Reservoirs, Proceedings of the 2007 Annual Meeting of JSME Tohoku Regional Student Division, March 5, 2007, Hirosaki University, (2007), pp.35-36 (Presentation No.204).
封圧下における脆性材料の混合モードき裂進展挙動に関する研究

山口裕之, 欅田雄輝, 高橋亨, 坂口清敏, 佐藤一志, 松木浩二, 橋田俊之

日本機械学会東北支部第37回学生員卒業研究発表講演会　2007/03/05

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山口裕之，欅田雄輝,高橋亨，坂口清敏，佐藤一志，松木浩二，橋田俊之，封圧下における脆性材料の混合モードき裂進展挙動に関する研究，日本機械学会東北支部第37回学生員卒業研究発表講演会，（2007年3月5日，弘前大学）, (2007),pp. 37-38 (講演番号205)． Hiroyuki Yamaguchi, Kunigida Yuki, Toru Takahashi, Kiyotoshi Sakaguchi, Kazushi Sato, Koji Matsuki, and Toshiyuki Hashida, Mixed Mode Crack Growth in Brittle Materials under Confining Pressures, Proceedings of the 2007 Annual Meeting of JSME Tohoku Regional Student Division, March 5, 2007, Hirosaki University, (2007), pp.37-38 (Presentation No.205).
自己組織化マッピング手法を用いたSOFCの損傷可視化に関する研究

佐藤一永, 今中規景, 福井健一, 八代圭司, 沼尾正行, 川田達也, 湯上浩雄, 橋田俊之, 水崎純一郎

第15回SOFC研究発表会　2006/12/05

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佐藤一永，今中規景，福井健一，八代圭司，沼尾正行，川田達也，湯上浩雄，橋田俊之，水崎純一郎，自己組織化マッピング手法を用いたSOFCの損傷可視化に関する研究，SOFC研究発表会
Effects of Thermal Stresses on Rock Permeability with Application to the Thermal Extraction from Supercritical Rock Masses International-presentation

Ryuichi Chiba, Yohei Takashima, Toru Takahashi, Takatoshi Ito, Kazuo Hayashi, Toshiyuki Hashida

International Conference on Renewable Energy 2006　2006/10/09

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Ryuichi Chiba,Yohei Takashima, Toru Takahashi, Takatoshi Ito, Kazuo Hayashi and Toshiyuki Hashida, Effects of Thermal Stresses on Rock Permeability with Application to the Thermal Extraction from Supercritical Rock Masses, Abstracts of International Conference on Renewable Energy 2006, 9-13 October 2006, Makuhari Messe, Chiba, Japan, O-G-4-2, (2006), p. 52.
Numerical Solution of Fractional Advection-Dispersion Equation for Non-Fickian Diffusion in Fractional Porous Aquifer International-presentation

Ryuichi Chiba, Sergei Fomin, Vladimir Chugnov, Yuichi Niibori, Toshiyuki Hashida

International Conference on Renewable Energy 2006　2006/10/09

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Ryuichi Chiba, Sergei Fomin, Vladimir Chugnov, Yuichi Niibori and Toshiyuki Hashida, Numerical Solution of Fractional Advection-Dispersion Equation for Non-Fickian Diffusion in Fractional Porous Aquifer, Abstracts of International Conference on Renewable Energy 2006, 9-13 October 2006, Makuhari Messe, Chiba, Japan, P-G-11, (2006), p. 113.
イットリア安定化ジルコニアの電気特性に及ぼす力学的負荷の影響に関する研究

鳴海涼, 佐藤一永, 橋田俊之, 川田達也, 八代圭司, 湯上浩雄, 水崎純一郎

2006年電気化学秋季大会　2006/09/14

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鳴海涼, 佐藤一永, 橋田俊之, 川田達也, 八代圭司, 湯上浩雄, 水崎純一郎, イットリア安定化ジルコニアの電気特性に及ぼす力学的負荷の影響に関する研究，2006年電気化学秋季大会講演要旨集，平成18年9月14-15日，同志社大学工学部，2F28 (2006), p. 160. R. Narumi, K. Sato, T. Hashida, T. Kawada, K. Yashiro, H. Yugami, J. Mizusaki, Effect of mechanical load on electrical property of yttria-stabilized zirconia, Proceedings of 2006 Autumn Meeting of The Electrochemical Society of Japan, 14th-15th September 2006, Doshisha University, 2F28 (2006), p. 160.
断裂型岩体を対象としたCO₂地中圧入の数値シミュレーションに関する研究

佐々木健太, 藤井孝志, 新堀雄一, 橋田俊之

資源・素材学会　2006/09

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佐々木健太，藤井孝志，新堀雄一，橋田俊之, 断裂型岩体を対象としたCO2地中圧入の数値シミュレーションに関する研究, 資源・素材学会 ?????，平成年月日，，(2006), . Kenta SASAKI, Takashi FUJII, Yuuichi NIIBORI, Toshiyuki HASHIDA, Numerical simulation of CO2 injection into fractured type rock masses, ????? (2005), 9-10.
Influence of formation tobermorite on mechanical properties of hydrothermally solidified blast furnace slag International-presentation

Zhenzi Jing, Emile Hideki Ishida, Fangming Jin, Toshiyuki Hashida, Nakamichi Yamasaki

Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006)　2006/08/05

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Zhenzi Jing, Emile Hideki Ishida, Fangming Jin, Toshiyuki Hashida and Nakamichi Yamasaki, Influence of formation tobermorite on mechanical properties of hydrothermally solidified blast furnace slag, Abstracts of Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006),August 5-9, 2006,Sendai, Japan, (2006), pp88, OC-2-06
Numerical Solution of Fractional Advection-Dispersion Equation for Fractured Porous Aquifer International-presentation

Ryuichi CHIBA, Sergei FOMIN, Vladimir CHUGUNOV, Yuichi NIIBORI, Toshiyuki HASHIDA

Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006)　2006/08/05

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Ryuichi CHIBA, Sergei FOMIN, Vladimir CHUGUNOV, Yuichi NIIBORI and Toshiyuki HASHIDA, Numerical Solution of Fractional Advection-Dispersion Equation for Fractured Porous Aquifer, Abstracts of Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006),August 5-9, 2006,Sendai, Japan, (2006), pp89, OC-2-10
Numerical Simulation of Fluid Flow in CO₂ Injection into Fractured Type Rock International-presentation

Kenta SASAKI, Takashi FUJII, Yuichi NIIBORI, Toshiyuki HASHIDA

Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006)　2006/08/05

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Kenta SASAKI, Takashi FUJII, Yuichi NIIBORI, Toshiyuki HASHIDA, Numerical Simulation of Fluid Flow in CO2Å@Injection into Fractured Type Rock, Abstracts of Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006),August 5-9, 2006,Sendai, Japan, (2006), pp89, OC-2-11
Numerical Model of Nuclide Transport in Fractured Porous Medium with a Treatment of Radioactive Disintegration International-presentation

Mioo SHIRAI, Ryuichi CHIBA, Sergei FOMIN, Vladimir CHUGUNOV, Toru TAKAHASHI, Yuichi NIIBORI, Toshiyuki HASHIDA

Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006)　2006/08/05

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Mioo SHIRAI, Ryuichi CHIBA, Sergei FOMIN, Vladimir CHUGUNOV, Toru TAKAHASHI, Yuichi NIIBORI, and Toshiyuki HASHIDA, Numerical Model of Nuclide Transport in Fractured Porous Medium with a Treatment of Radioactive Disintegration, Abstracts of Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006),August 5-9, 2006,Sendai, Japan, (2006), pp90, OC-2-12
Experimental valuation of interaction in supercritical CO2/water/rock minerals system under sequestration conditions International-presentation

Hongfei Lin, Takashi Fujii, Reisuke Takisawa, Toru Takahashi, Toshiyuki Hashida

Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006)　2006/08/05

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Hongfei Lin, Takashi Fujii, Reisuke Takisawa, Toru Takahashi and Toshiyuki Hashida, Experimental valuation of interaction in supercritical CO2/water/rock minerals system under sequestration conditions, Abstracts of Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006),August 5-9, 2006,Sendai, Japan, (2006), pp103, P-033
Optimization of pH Value of Water Media for CO2 Reduction via Hydrothermal Process International-presentation

Takamasa ONOKI, Hiro TAKAHASHI, Toshinari KORI, Nakamichi YAMASAKI, Toshiyuki HASHIDA

Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006)　2006/08/05

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Takamasa ONOKI, Hiro TAKAHASHI, Toshinari KORI, Nakamichi YAMASAKI and Toshiyuki HASHIDA, Optimization of pH Value of Water Media for CO2 Reduction via Hydrothermal Process, Abstracts of Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006),August 5-9, 2006,Sendai, Japan, (2006), pp106, P-048
Numerical Analysis of Effects of Natural Crack Density on HDR Geothermal Energy Extraction International-presentation

Kei YOSHIDA, Sergei FOMIN, Toshiyuki HASHIDA

Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006)　2006/08/05

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Kei YOSHIDA, Sergei FOMIN, Toshiyuki HASHIDA, Numerical Analysis of Effects of Natural Crack Density on HDR Geothermal Energy Extraction, Abstracts of Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006),August 5-9, 2006,Sendai, Japan, (2006), pp107, P-050
Synthesis and Characterization of Nanometer NiO-SDC Composite Powders for Solid Oxide Fuel Cells International-presentation

Changsheng DING, Hajime OOMURA, Kazuhisa SATO, Toshiyuki HASHIDA

Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006)　2006/08/05

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Changsheng DING, Hajime OOMURA, Kazuhisa SATO, Toshiyuki HASHIDA, Synthesis and Characterization of Nanometer NiO-SDC Composite Powders for Solid Oxide Fuel Cells, Abstracts of Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006),August 5-9, 2006,Sendai, Japan, (2006), pp124, P-117
Effects of Titanium Surface Modification on adhesive properties of Hydroxyapatite Coating by Double Layered Capsule Hydrothermal Hot-pressing method International-presentation

Takamasa ONOKI, Toshiyuki HASHIDA, EIICHI YASUDA, Yasuhiro TANABE

Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006)　2006/08/05

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Takamasa ONOKI, Toshiyuki HASHIDA, EIICHI YASUDA and Yasuhiro TANABE, Effects of Titanium Surface Modification on adhesive properties of Hydroxyapatite Coating by Double Layered Capsule Hydrothermal Hot-pressing method, Abstracts of Joint Conference of 8th Int. Sympo. On Hydrothermal Reactions and 7th Int. Conf.on Solvo-Thermal Reactions (ISHR&ICSTR 2006),August 5-9, 2006,Sendai, Japan, (2006), pp134, P-160
カーボンナノチューブとセラミックスとの生体適用と生体材料

大森守, 橋田俊之, 木村久道, 大久保昭

第２回「ナノトキシコロジーアセスと微粒子・ナノチューブのバイオ応用」研究会　2006/06/22

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大森守, 橋田俊之, 木村久道, 大久保昭, カーボンナノチューブとセラミックスとの生体適用と生体材料, 第２回「ナノトキシコロジーアセスと微粒子・ナノチューブのバイオ応用」研究会，平成１８年６月２２日-２３日, 北海道大学学術交流会館, (2006).
Tribological Properties of Binder-Free Single-Walled Carbon Solids International-presentation

Go Yamamoto, Koshi Adachi, Yoshinori Sato, Toru Takahashi, Toshiyuki Hashida, Mamoru Omori, Akira Okubo, Kazuyuki Tohji

7th International Conference on The Science and Application of Nanotubes　2006/06/18

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Go Yamamoto, Koshi Adachi, Yoshinori Sato, Toru Takahashi, Toshiyuki Hashida, Mamoru Omori, Akira Okubo, and Kazuyuki Tohji, Tribological Properties of Binder-Free Single-Walled Carbon Solids, Abstracts & Program of 7th International Conference on The Science and Application of Nanotubes, (June 18-23, 2006, Nagano, Japan), Contribution E. 019-Thursday, June 22, (2006), p.298.
Synthesis and Characretization of Single-Walled Carbon Nanotube-Silicon Carbide Nanocomposites International-presentation

Toru Takahashi, Go Yamamoto, Mamoru Omori, Yoshinori Sato, Kenji Yokomizo, Toshiyuki Hashida, Akira Okubo, Kazuyuki Tohji

7th International Conference on The Science and Application of Nanotubes　2006/06/18

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Toru Takahashi, Go Yamamoto, Mamoru Omori, Yoshinori Sato, Kenji Yokomizo, Toshiyuki Hashida, Akira Okubo, and Kazuyuki Tohji, Synthesis and Characretization of Single-Walled Carbon Nanotube-Silicon Carbide Nanocomposites, Abstracts & Program of 7th International Conference on The Science and Application of Nanotubes, (June 18-23, 2006, Nagano, Japan), Contribution E. 023-Thursday, June 22, (2006), p.302.
Development of Mechanical Design Methodology for Solid Oxide Fuel Cells International-presentation

Toshiyuki Hashida, Kazuhisa Sato, Tatsuya Kawada, Junichiro Mizusaki, Hiroo Yugami

International Conference For Mechanical and Automotive Technologies 2006 (ICMATE 2006)　2006/04/26

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New University for Mechanical and Automotive Technology Education, (Chonbuk National University, Jeonju, Jeonbuk, Korea, April 26-28, 2006), pp.39-55
支持膜型固体酸化物燃料電池の製作と評価に関する研究

京谷真太郎, 大村肇, 佐藤一永, 橋田俊之

日本機械学会東北支部第36回学生員卒業研究発表講演会　2006/03/04

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京谷真太郎，大村肇，佐藤一永，橋田俊之，支持膜型固体酸化物燃料電池の製作と評価に関する研究，日本機械学会東北支部第36回学生員卒業研究発表講演会，（2006年3月4日，いわき明星大学）, (2006), 講演番号411． Sintaro Proceedings of the 2006 Annual Meeting of JSME Tohoku Regional Student Division, March 4, 2006, Iwaki Meisei University, (2006), Presentation No. 411.
CO₂地下貯留のための岩石と超臨界CO₂との相互作用に関する研究

瀧澤礼介, 藤井孝志, 林宏飛, 高橋亨, 橋田俊之

日本機械学会東北支部第36回学生員卒業研究発表講演会　2006/03/04

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瀧澤礼介，藤井孝志，林宏飛，高橋亨，橋田俊之，CO2地下貯留のための岩石と超臨界CO2との相互作用に関する研究,日本機械学会東北支部第36回学生員卒業研究発表講演会，（2006年3月4日，いわき明星大学）, (2006), 講演番号412 Proceedings of the 2006 Annual Meeting of JSME Tohoku Regional Student Division, March 4, 2006, Iwaki Meisei University, (2005), Presentation No.412.
Damage Mechanism in Ceria-Based Solid Oxide Fuel Cells under Simulated Operating Conditions International-presentation

2005 Taiwan-Japan Joint Conference on SOFC　2005/12/19

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National Central University, Taoyuan County, Taiwan, December 19-20, 2005 (2005), 161-182.
Development of Evaluation Methods for Solid Oxide Fuel Cells International-presentation

The 5th Korea-Japan Students’ Symposium –Fast Ion Transport in Solids and Through Interfaces; The Related Materials and Phenomena-　2004/10/27

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October 27-30,2004, Research Institute for Advanced Materials, Seoul National University, Korea, (2004).
Development of Evaluation Methods for Ceria-Based Solid Oxide Fuel Cells International-presentation

Kazushi Sato, Toshiyuki Hashida

21COE Joint Workshop on Nano Science in Energy Technology, with Emphasis on Transport and Reactions in or on Solids　2004/09/27

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September 27-28, 2004, Massachusetts Institute of Technology, Cambridge, USA, Program and Abstract, K-06.
Hydraulic Fracturing Experiments and Rock Fracture Mechanics International-presentation

Toshiyuki Hashida, Kazushi Sato

International Workshop on Rock Fracture Mechanics　2004/09/24

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September 24, 2004, GeoForschungsZentrum (GFZ) Potsdam, Telegrafenberg, Potsdam
Advances in Mathematical Modeling of Hydraulic Stimulation of a Subterranean Fractured Reservoir International-presentation

Sergei Fomin, Toshiyuki Hashida

8th International Workshop on New Approches to High-Tech: Nondestructive Testing and Computer Simulations in Science and Engineering　2004/06/07

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June 7-13, 2004, St. Petersburg, Russia, Proceedings of the St. Petersburg Academy of Sciences on Strength Problems (SPAS), Vol. 8 (2004), 8-11.
超臨界水と岩石の相互作用を利用した地熱貯留層形成の可能性

橋田俊之, 高橋亨

第52期第1回日本材料学会高温強度部門委員会　2003/07/04

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第52期第1回日本材料学会高温強度部門委員会講演会資料（日本材料学会会議室、京都、平成15年7月4日）、pp. 1-6.
地殻エネルギー抽出のための複雑き裂システムの制御

第107回日本材料学会破壊力学部門委員会　2002/11/15

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第107回破壊力学部門委員会講演会資料, 日本材料学会（平成14年11月15日、仙台市）, Vol. 51, No. 3 (2002), pp. 61-65.
Development of Design Methodology for Deep-seated Geothermal Energy Extraction Systems International-presentation

International Symposium of Young Scholars on Mechanics and Material Engineering for Science and Experiments　2001/08/11
超臨界岩体からの地殻エネルギー抽出の可能性

東京地学協会地学クラブ講演会　2001/07/19
コンクリート廃材およびガラス廃材の再利用に向けて

資源素材学会東北支部春季大会　2001/06/20
Review of Progress Toward the Development of Geothermal Reactor International-presentation

The Joint 6th Int. Symposium on Hydrothermal Reactions and 4th Int. Conference on Solvo-Thermal Reactions　2000/07/25
次世代型地熱開発

平成12年度地熱研究会　2000/07/19
未来型地殻エネルギー抽出

日本学術会議地球・エネルギー・資源 -近未来技術の展望に関するシンポジュウム　2000/06/30
Session 6A: Fracture Parameter (II) International-presentation

Third International Conference on Fracture Mechanics of Concrete and Concerete Structures　1998/10/12

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(プロシーディング) Proc. of Third International Conference on Fracture Mechanics of Concrete and Concerete Structures 1998
セッション：材料力学環境工学

日本機械学会、第76期全国大会　1998/10/03

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(プロシーディング) 1998
特別企画フォーラム高効率ガスタービンの現状と将来

日本機械学会、第76期全国大会　1998/10/03

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(プロシーディング) 1998
Development of environmentally-friendly processing methods for cementitious material International-presentation

International Symposium on Solvethermal & Hydrothermal Processes　1997/09/01

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(プロシーディング) 1997 54 55
セッション：学生賞セッション

日本機械学会東北支部第32期総会・講演会　1997/03/08

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(プロシーディング) 1997
Development of Solvothermal Methods for Recycling Concrete Wastes International-presentation

The Second International Conference on Solvothermal Reactions　1996/12/18

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(プロシーディング) Proc. of The Second International Conference on Solvothermal Reactions 1996
Development of Solvothermal Methods for Recycling Concerete Wastes International-presentation

The Second International Conference on Solvothermal Reactions　1996/12/18

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(プロシーディング) Proc. of The Second International Conference on Solvothermal Reactions 1996
セッション：貯留層5

日本地熱学会平成８年学術講演会　1996/12/08

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(プロシーディング) 1996
Session: Eco-Cementitious Composites II International-presentation

The Fourth Materials Engineering Conference　1996/11/10

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(プロシーディング) Proc. of The Fourth Materials Engineering Conference 1996
水熱ホットプレス法による繊維複合材料の開発

財団法人四国産業・技術振興センター主催平成7年度高温高圧流体反応に関する技術セミナー　1996/03/31

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(プロシーディング) 1996
水熱ホットプレス法による繊維複合材料の開発

高温高圧流体反応平成７年度技術セミナー（財）四国産業・技術振興センター　1996/03/11
Ductile Fracture in Cementitious Materials? International-presentation

First International Conference on Fracture Mechanics of Concrete Structures　1992/06/01
Concrete International-presentation

The 10th International Acoustic Emission Symposium　1990/10/22

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Industrial Property Rights 10

セメント系繊維複合材料 Fiber Reinforced Cementitious Composites

橋田俊之, 宮外清貴, 高島博之

Property Type: Patent
ハイドロキシアパタイト多孔質焼結体の製造方法 Production Method for Sintered Porous Hydroxyapatite Ceramics

中平敦, 村上隆幸, 橋田俊之, 細井和幸, 小野木伯薫

Property Type: Patent
軽量なセメント系電波吸収体およびその製造方法 Lightweight Electric Wave Absorbing Solids and Their Manufacturing Method

橋田俊之, 佐藤源之, 宮外清貴, 高島博之

Property Type: Patent
短繊維複合セメント系押出成形材料とその製造方法 Extrusion Molded Cementitious Composites by Discontinuous Fibers and Their Manufacturing Method

橋田俊之, 宮外清貴, 高島博之

Property Type: Patent
短繊維補強セメント系押出成形材料 Discontinuous Fiber Reinforced Cementitious Composites Manufactured by Extrusion Molding

橋田俊之, 宮外清貴, 高島博之

Property Type: Patent
短繊維補強セメント系押出成形材料 Discontinuous Fiber Reinforced Cementitious Composites Manufactured by Extrusion Molding

橋田俊之, 宮外清貴, 高島博之

Property Type: Patent
蓄電材料及びウルトラ蓄電体

福原幹夫, 長谷川史彦, 黒田共之, 伊藤修, 橋田俊之, 中谷丈史, 森田昌浩

特許7057577

Property Type: Patent
蓄電材料及びウルトラ蓄電体

福原幹夫, 黒田共之, 長谷川史彦, 伊藤修, 橋田俊之, 中谷丈史, 森田昌浩

Property Type: Patent
学習装置，浸透率推定システム，学習方法及びプログラム

小野寺真也, 橋田俊之, 鈴木杏奈

Property Type: Patent
Materials for ultra-capacitors, and ultra-capacitors

Property Type: Patent

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Research Projects 33

超臨界岩体からの地殻エネルギー抽出に関する研究 Competitive

1997/09 - Present
マイクロメカニックスに基づく繊維複合材料の開発 Competitive

1989/04 - Present
セラミックコーティングの耐熱衝撃・疲労性能評価に関する研究 Competitive

1986/04 - Present
Development of quantum solid-sate capacitor using cellulose nanofibers and contribution to the creation of sustainable society

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2022/04/01 - 2025/03/31
Development and risk assessment of new geothermal development by supercritical CO2 fracturing

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2020/04/01 - 2024/03/31
Preparation of physical solid-state capacitors using nano-scale unevenness surface structure and their applications to environment-conscious energy systems

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2019/04/01 - 2022/03/31
Preparation of Novel Silicon Nitride Ceramics Using Non-oxide Sintering Agents and Their Applications for Structural/Functional Materials

Hashida Toshiyuki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2016/04/01 - 2019/03/31

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The use of non-oxide sintering agents was investigated to prepare silicon nitride ceramics with enhanced high-temperature properties. A non-oxide sintering agent containing yttrium was selected and silicon nitride samples were successfully sintered with a full density utilizing the agent. Three-point bending tests conducted at argon gas environment revealed that the silicon nitride prepared with the non-oxide sintering agent maintained higher flexural strength at high temperatures compared with that for an oxide sintering agent, yttria. The phases of the non-oxide, and oxide sintering agents in the sintered condition were shown to be crystal and amorphous, respectively. The crystal phase may be a plausible reason for the improved high-temperature strength in the non-oxide sintering. Furthermore, the addition of the non-oxide agent caused no deterioration in the thermal conductivity measured with a laser flash method, and led to excellent tribological characteristics in water.
Development of visualization technologies for battery security society

Hashida Toshiyuki, SATO Kazuhisa, SUZUKI Ken, FUKUI Ken-ichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2015/04/01 - 2017/03/31

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This study presents technologies of visualizing the mechanical damage in Li ion secondary cells and solid oxide fuel cells (SOFCs) using acoustic emission (AE) method and laser microscope technique. For Li ion secondary cells, we have developed an AE/laser microscope technique for monitoring the dimensional change in Si-electrodes due to Li ion migration and the associated delamination of the Si-electrode from the substrate. Three stages in the Li ion migration process has been newly discovered in this study. We have also succeeded to detect the mechanical damages such as vertical cracking and delamination induced by the electro-chemical oxidation in the operation of SOFCs, and proposed a self-organization map of the mechanical damages on the basis of the AE monitoring. The above- mentioned technologies are expected to provide a viable foundation for the development of battery security society.
テンプレート法によるナノ界面制御を用いたＣＮＴ複合材料の高機能化と展開応用

橋田俊之, WANG Weili

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特別研究員奨励費

Institution: 東北大学

2012/04/01 - 2015/03/31

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多層カーボンナノチューブ(MWCNT)とアルミナからなる複合材料の高機能化と応用展開を目的として、以下の3つの研究を実施した．研究1：複合材料の破壊特性の支配因子であるMWCNTとアルミナとの界面強度を評価する目的で、埋込長さ傾斜制御型引抜試験法を開発した。MWCNT-アルミナ間の界面強度は19 MPa程度であることを明らかにするとともに、得られた値は理論モデルから予想される界面強度と概ね一致していた。これらの結果は、複合材料のさらなる破壊特性の向上のためには、MWCNT-アルミナ間の界面強度を適切な値まで低減させることが有効であることを示すものである。研究2：常圧焼成法による複合材料作製技術を確立する目的で、MWCNT/アルミナ複合材料の焼結特性ならびに機械的特性におよぼすMWCNT添加量とMWCNT種の影響を検討した。MWCNT添加量の少ない試料において緻密な組織を有する試料の作製に成功するとともに、適切な表面性状ならびに剛性を有するMWCNTを複合化に使用することで、アルミナ焼結体の強度・靱性特性を超える破壊特性を有する試料の作製に成功した。さらに、常圧焼成法を用いることで大型試料ならびに半球カップ状の試料を作製することが可能となった。研究3：MWCNT/アルミナ複合材料の摩擦･摩耗特性に関する知見を得ることを目的として、摩擦･摩耗特性に及ぼす作製条件ならびに摩擦環境の影響評価を行った。摺動距離が短い条件において、MWCNT添加量の増加に伴い摩擦係数は低下する傾向が認められた。MWCNTsを5.5 vol.%添加した複合材料の摩擦係数は約0.3であり、この値はアルミナ焼結体と比較して約26%低い値であった。一方、摺動距離の増加に伴い摩擦係数は上昇し、定常状態の摩擦係数はいずれの条件で作製した複合材料においてもアルミナ焼結体と同程度の値(0.4-0.5程度)であった。
Development of Design-Fabrication-Evaluation Methodology for High Performance Composites Reinforced by Carbon Nanotube

HASHIDA Toshiyuki, TOHJI Kazuyuki, TAKAGI Toshiyuki, ONO Takahito, FU Ning, OMORI Mamoru, YAMAMOTO Go

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (S)

Institution: Tohoku University

2009/05/11 - 2014/03/31

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Preparation and evaluation of multi-walled carbon nanotube (MWCNT) reinforced alumina composites were conducted with the objective of promoting practical applications of engineered ceramic composites. Uniform dispersion of MWCNTs in matrix precursors was achieved primarily by controlling the rigidity of the MWCNTs used and through their surface modifications. Furthermore, in view of the advantage for industrial applications, a pressureless sintering method was developed in contrast with the pressure-assisted techniques used in the previous studies. The achievements then enabled us to successfully produce homogeneous MWCNT/alumina composites with the highest strength and fracture toughness compared with the literature data. It was demonstrated that the MWCNT/alumina composites developed in this study had superior friction/wear properties, electric conductivity, and electric magnetic wave absorption characteristics, providing a useful foundation for their practical applications.
Design Methodology of Thin Electrytes for the Development of Intermediate Temperature SOFCs

HASHIDA Toshiyuki, MIZUSAKI Junichro, YUGAMI Hiroo, KAWADA Tatsuya, SATO Kazuhisa

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2006 - 2008
Nano-ionic Structure for the Development of High Performance Solid Oxide Fuel Cells

MIZUSAKI Junichiro, HASHIDA Toshiyuki, YASHIRO Keiji, SATO Kazuhisa

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Priority Areas

Institution: Tohoku University

2004 - 2008
Formation of Superaitical Geothermal Resevoirs by Means of Supercritical Water-Induced Cracking

HASHIDA Toshiyuki, HAYASHI Kazuo, TSUCHIDA Noriyuki, NIIBORI Yuichi, TAKAHASHI Toru

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2002 - 2004

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The research project determined the feasibility of utilizing the interactions between supercritical water and rock-forming minerals in the creation of an artificial subsurface geothermal reservoir in a deep-seated rock mass, in which temperature and pressure conditions exceed the critical point for water. The main results obtained in this study are summarized below. 1.Application of confining pressures in high temperature testing was shown tot be effective in order to mitigate the thermal stress induced micro-cracking due to thermal expansion mismatch of the rock-forming minerals by conducting ultrasonic wave velocity measurements. 2.Permeability measurements were made for several types of granitic rocks using thick-walled cylindrical specimens. The rock specimens included cores taken from the deep-seated high temperature rock mass at an actual geothermal field site. It has been shown that the permeability measured jumped significantly when the condition of water exceeded the critical point for water regardless of the rock types used in this study. The significant increase in permeability was shown to be due to grain-scale microcracking induced from the interaction between the supercritical water and rock-forming minerals. The extent of the permeability increase was less for the rock specimens taken from the deep-seated rock masses than that for the rock types obtained from outcrops. 3.Tri-axial compression tests were conducted in order to examine the effect of stress on the above-mentioned supercritical water induced cracking phenomenon. It has been demonstrated that the microcrack density at the vicinity of the final fracture plane was signifcantly larger than that at the far-field when the temperature was greater than the critical temperature. The increase in the microcrack density points out that the supercritical water induced cracking was accelerated by the effect of stress. The accelerated cracking is newty named as supercritical water enhanced stress corrosion cracking. The experimental observation may suggest the potential use of the supercritical water enhanced stress corrosion cracking the expansion of hydraulically-induced geothermal reservoirs. 4.We undertook long-term thermal extraction numerical modeling analysis, for a supercritical rock mass, which incorporated fluid flow characteristics (i. e. circulating water) and thermal transfer in the surrounding rock mass. We considered the effects of temperacure and pressure in the supercritical fluid regime, as well as fluid density, viscosity etc. Based on the numerical results, it has been shown that there is an optimum injection rate to extract the heat energy from the supercritical reservoir combined with subcritical temperacure rock mass.
DIRECT SYNTHESIS OF ORGANIC COMPOUNDS FROM CARSON DIOXIDE BY HYDROTHERMAL PROCESS

YAMASAKI Nakamichi, NAKATSUKA Katsuto, ODA Yukito, GOTO Yoshihiko, HASHIDA Toshiyuki, TSUCHIYA Noriyoshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: TOHOKU UNIVERSITY

2001 - 2002

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Water and CO_2 were easily reduced by using metal Fe and Ni under hydrothermal conditions and to form hydrocarbons. The activated hydrogen from water and the activated CO_2 on metal surface reacted each other and to form hydrocarbons. We confirmed the basic principle of above reactions. The produced alkane groups (gaseous phase) under neutral hydrothermal conditions showed this reaction proceed according to a Fisher-Tropseh reaction via CO formation. On acidic conditions, many carboxylic acids were detected in solution phase. When the magnetite powder was used instead of metals, ethanol was detected in solution phase. In final year (2002), the bench scale flow system autoclave for industrial scale treatment were developed and confirmed the possibility in use the research of non-equilibrium reaction. The batch type autoclave can be used for equilibrium reaction and fitted in the ideal basic research, however this flow system autoclave can be used in the natural analogue experiment (simulator of water flow underground) and the tube digester research for the practical industrial scale treatment. This non-equilibrium reaction in a typical complex system and the non-traditional science. In here, the lathe scrap of metallic iron was set in this tube reactor and the mixed flow of HCl solution and CO_2 gas were introduced in this heating tabs and the outlet sample from tube reactor was collect and determined the carboxylic compounds. In systematic research planning, firstly, the activated hydrogen and CO_2 are formed, and hydrocarbons were synthesized at second stage, and at next stage we discovered the selective formation of organic compounds by the control of hydrothermal conditions and at the last stage we could showed the possibility of large scale treatment by using this flow system autoclave.
固体酸化物型燃料電池の設計・作成と機械的特性評価に関する研究 Competitive

2001/04 -
Optimization of Heat Extraction Performance from Multiple Borehole Reservoir Systems-Towards the Enlargement of Geothermal Reservoirs and Enhancement of Heat Extraction-

HASHIDA Toshiyuki, NIIBORI Yuichi, MATSUKI Koji, HAYASHI Kazuo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2000 - 2001

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An improved three-dimensional simulation model (FRACSIM-3D) for the fractured hot-dry-rock (HDR) geothermal reservoir is developed. It incorporates the mechanical rock-fluid interaction during hydraulic stimulation and quantitatively predicts the 3D reservoir growth behavior. In this model the pre-existing fractures are generated stochastically. The fractal size distribution of the penny-shaped fractures with random orientation is assumed. The fluid flow through the discrete fracture network is simulated by mapping the connectivity of the fractured rock to a regular cubic grid under condition of constant injection pressure. The fluid flow is approximated by the Darcy law equation. The fluid pressure from the injection well induces the growth of the fractures' apertures due to the fracture shear offset. Computation of the fracture dilation requires several iterations: solving the complete flow model simulating the fracture system anew each time and recalculating the shear displacement using the inner fracture pressure from the previous iteration. The numerical model is calibrated on the basis of the field data available for the Hijiori HDR reservoir. For instance, the series of numerical computations was carried for the different randomly seeded initial distributions of fractures and their apertures within the reservoir. The distribution, which leads to a good agreement of the numerically obtained and experimentally detected Hijiori reservoir's volume and growth direction, was chosen as an appropriate one for simulating the natural fractured media. The model was used for the assessment of the adequate stress regime of the Hijiory reservoir since the related field data obtained by the different experimental technique are not very reliable. The latest version of FRACSIM-3D incorporates the multi-borehole system of injection and production wells. This improvement of the model makes possible to analyze the effect of different borehole system arrangement on the reservoir productivity. A number of numerical experiments for the different geometrical boreholes configurations have been conducted. As a result, the optimal arrangements of the production and injection wells, which provide the relevant reservoir recovery rate with lesser amount of active boreholes, are proposed.
Development of Monitoring Technique for Creep Deterioration in High Temperature Materials Using Miniaturized Specimens -Establishment of a New SP Creep Testing Method and Its Application-

HASHIDA Toshiyuki, KOMAZAKI Shin-ichi, KAWASAKI Akira, SHOJI Tetsuo, OKADA Ikuo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

1999 - 2001

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A small punch creep (SP-C) testing method using a miniaturized specimen with a dimension of 10mm by 10mm by 0.3mm has been demonstrated for evaluating creep properties and mechanical deterioration due to long-term service operations at high temperatures. This testing method involves the application of a concentrated central load to the specimen rigidly supported at its surrounding region, and determines a central deformation vs. time curve for a given load and temperature. The SP-C method was applied to several types of high temperature boiler and turbine materials, including tungsten-alloyed 9Cr ferritic steel, 316 type stainless steel, and Ni-based super alloys. Experimental results revealed that the overall shapes of the creep curves obtained SP-C tests were qualitatively similar to those obtained from conventional uniaxial creep tests, which clearly delineate primary, secondary, and tertiary creep stages. Bending was a dominant mode of deformation governing the primary creep region, while membrane stretching was dominant mode in the secondary and tertiary creep regions. A correlation with uniaxial creep was determined in terms of stress (load) exponent and apparent activation energy for creep deformation. In particular, the apparent activation energy obtained from the SP-C method was close to that determined from uniaxial creep tests. The rupture data was deduced from the SP-C tests conducted on the used materials using the Larson-Miller parameters. The results demonstrated that the SP-C testing method enables us to determine the effects of the high temperature materials degradation on the creep properties. The above experimental evidence suggests that the SP-C testing technique provides a useful tool for evaluating degradation of creep properties for structural components in-service.
Fracture Mechanics Study of Shear Type Fracture Process Zone in Microcracking Materials

HASHIDA Toshiyuki, SATO Kazushi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: TOHOKU UNIVERSITY

1998 - 1999

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The objective of this research is to develop a fracture mechanics method for predicting the growth of hydraulically driven cracks in deep-seated rock masses for next generation geothermal energy extraction. The research results are described below for the each research task (I-IV). Task (I) : Fracture criterion of rocks Tension and compression tests of Iidate granite were conducted at confining pressures up to 150 MPa and pore pressure up to 50 MPa. Tension softening and shear weakening curves were deduced from the test results. It was shown that the deduced experimental curves were independent of the confining and pore pressures used in this study, and that the relationships can be employed for analyzing the mixed mode crack growth. Task (II) : Simulated hydraulic fracturing experiment Mini-hydraulic fracturing tests were performed on thick-walled cylindrical specimens under a variety of confining pressure. The tests indicated that an opening type crack was created when the differential stress was less than 100 MPa and a shear type crack was initiated if the differential stress exceeded 100 MPa. This observation suggests that shear fracture may be induced by hydraulic injection in deep-seated rock masses. Task (III) : FEM code for analyzing the growth of hydraulically driven cracks A FEM code was newly developed by employing an embedded crack element. The fracture criterion determined in Task (I) was incorporated into the code the crack growth condition. Task (IV) : Numerical analysis of hydraulic fracturing and formation process of artificial reservoirs. The hydraulic crack growth at depth was examined using the FEM code under a typical tectonic stress condition. It was shown that the crack growth was opening type at shallower regime and at greater depth shear fracture was predicted to occur followed by the transition to open fracture.
Development of Life Predictive Method For Thermal Barrier Coating Systems

HASHIDA Toshiyuki, KAWAI Hisataka, SATO Kazushi, KAWASAKI Akira

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

1997 - 1998

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The objective of this research is to develop evaluation methods of charcterizing thermal barrier coating (TBC) systems and predictive methodology of their life with special reference to a leading edge of advanced gas turbine blades, The research results are summarized for the following individual task. Task (1) Preparation of TBC specimens : TBC specimens with a top coat of ZrO and a bond coat of NiCrAlY were prepared by air plasma splay and electron beam-physical vapor deposition techniques. The specimen geometry was a cylindrical tube for simulating the curvature of leading edges and the substrate was a Ni-based superal loy. Task (2) Evaluation of interface properties (2-1) Thermal shock/fatigue tests were conducted on the cylindrical specimens with the TBCs using a laser heating method. A air-forced cooling cycle was employed to simulate the thermal transient history during trips. An acoustic emission method was used to examine the fracture process in the laser heating experiment. It was shown from the AE monitoring that the buckling of the top coating layer induced the final spallation of the TBC system. Furthermore, the effect of high-temperature oxidation on the spallation was evaluated in terms of the thermal gradient within the TBC and the number of cycles to failure. (2-2) Thermal stress analyses using a FEM method were performed with reference to the cylindrical specimen geometry. The interface crack was accounted for in the thermal stress analyses. The stress intensity factor was determined as a function of interfacial crack length which formed a foundation for the analysis of the spallation behavior of the TBCs. Task (3) The experimental data of interface crack growth obtained from the laser heating thermal shock/fatigue tests were used to produce the fracture mechanics based relationship of fatigue crack growth rate through the interfacial crack stress intensity factor as determined by the FEM, The relationship was then used to reproduce the fracture process in the laser heating experiment. It was demonstrated that the predicted critical interfacial crack length was close to that observed in the laser heating experiment, indicating the validity of the fracture mechanics based life predictive method.
Fracture Mechanics Study for Toughening Fiber Reinforced Composites

HASHIDA Toshiyuki, SATO Kazushi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

1996 - 1997

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The objective of this research is firstly to develop a fracture mechanics based micromechanical model for the design of pseudo strain hardening composites reinforced with random discontinuous and aligned continuous fibers, and then to propose a method for optimizing the strength and the toughness of composites on the basis of themicromechanical model. The following tasks form major subjects of this research. Task (1) Development of Design Model We developed a micromechanical model which provides a link between the composite properties (strength and toughness) and the composite parameters (fiber parameters : dimensions, volume fraction and mechanical properties ; matrix parameters : toughness and elastic moduli ; interface shear strength ; snubbing coefficient). The model is applicable to both the cases of fiber pull-out and fiber rupture. Task (2) Preparation and Evaluation of Fiber Reinforced Composites Using a spark plasma sintering method, we prepared continuos carbon fiber reinforced SiC composites and LAS/wolastonite composites reinforced with short random fibers of a 304 type stainless steel. It was shown by conducting three point bend tests that the micromechanical model has a capability of predicting the mechanical properties of the prepared composites. Furthermore, the LAS/wolastonite composites were shown to produce pseudo strain hardening behavior. Task (3) Optimization of Composite Parameters Based on the micromechanical model, we devised a design chart which embodied the conditions for pseudo strain hardening, uniform fiber distribution, and fiber rupture. Finally, we proposed a methodology of optimizing the fiber parameters for high toughness composites by conducting parametric studies.
Development of a Fractured Geothermal Reservoir Simulator in terms of Mechanical and Chemical Water/Rock Interactions.

HASHIDA Toshiyuki, HANANO Mineyuki, KITANO Koichi, WATANABE Kimio

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

1995 - 1996

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Hot Dry Rock (HDR)/Hot Wet Rock (HWR) geothermal energy extraction systems, which attract a great deal of attention as one of new technologies to obtain energy, are designed to utilize natural and artificial subsurface fractures for the heat exchange between water and hot rock. Numerical analysis of water flow and heat transfer in fractured geothermal reservoir is strongly needed to estimate the heat mining performance of these systems. In this study, first of all, HDR/HWR geothermal reservoirs were characterized by fracture network based on fractal geometry which is getting popular to assess subsurface fractures. By using fracture network geothermal reservoir model, the mithodology to analyze water flow and heat transfer in reservoirs has been established. The changes of fracture apertures has significant influence on fluid flow, and it is important to estimate fracture behavior during water circulation. The mechanical and chemical interaction between water and rock was included into the program. Share dilation of each fracture caused by water pressure was calculated based on rock mechanics theory. Rock dissolution and precipitation experiments in high pressure and temperatures have been performed. Water/Rock interaction rate was obtained as a function of temperature and surface water velocity. Short-term water circulation test was conducted at Ogachi field, one of HDR/HWR test sites in Japan. The profile of production temperature was analyzed by the program developed in this study, and the results has shown good agreement with the actual data. Furthermore this analysis could give a stochastic estimation of long-term performance of Ogachi reservoir.
Multi-Crack Characterization

TAKAYASU Hideki, KANEKO Katsuhiko, SASSA Koichi, SANO Masami, HASHIDA Toshiyuki, YUSA Yuki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Priority Areas

Institution: Tohoku University

1993 - 1995

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Results obtained during the research term (1993-1995) are summarized for each researcher in the following : (1) We investigated universal properties of fracture by numerical simulations. It was proven that strong macroscopic universality holds both in the cases of crack propagation model on a plane and of 3-dimensional impact fracture (Takayasu). (2) Asynthetic modelling of geothermal structure was developed which accounts for the heat discharge at the surface, the subsurface temperature, the electric resistivity structure, the Curie point depth and the inert gas composition of fumarolic gas (Yusa). (3) The multiple cracking behavior in rock was examined based on the fractal nature of acoustic emission (AE). It is demonstrated that the multiple cracking behavior in rock could be analyzed using a numerical model in conjunction with the AE results (Hashida). (4) The conditions for propagation and unstable oscillation of cracks were characterized by nondimentional fracture parameters for both single crack and multiple cracks (Sano). (5) A new method of detecting and monitoring fractures by use of seismic waves was proposed. The effect of injecting air into fracture was nvestigated by using both model experiments and numerical simulations. An AVO inversion method and a depth transform technique of seismic reflection data were developed. A current-convergent resistivity log by adding auxiliary sources was investigated (Sasa). (6) A fractal model to quantify the crack distribution in rock masses and a method to evaluate model input parameters by a lineament analysis of earth satellite image have been proposed. By applying the proposed method to a granite field, the crack distribution and the connectivity of cracks have been estimated (kaneko). (7) Analytical data of aero-photo and satellite images were compared with geologically identified natural fracture systems. Geologically undefined lineaments were traced by gamma ray survey. A new analytical method for satellite image was introduced (Takashima). (8) The fractal analysis on the 1500 faults of 6 groups suggests that the relationship between the width of shear zone and fault displacement, size (displacement) distribution, and the spatial distributions of faults and fault displacements show the fractal distributions whose fractal dimensions change depending on the ductility of rocks and the total energy density injected (Ohtsuki). (9) The structure of elastic wave velocity and density of the crust is known to be heterogeneous. Analyzing the well-log data obtained at 5 wells in Kyushu and Kanto, Japan, we found that their power spectra obey a power law for a wide range in wavelength from a few tens of centimeters to a few hundred meters (Sato). (10) Fractal dimensions of splitting fracture surface of welded tuff specimens using by divider method are nearly in inverse proportion to the strength. On the other hand, the coefficient of variation of dimensions near the pre-crack in CT specimens are nealry in proportion to the fracture toughness (Tano).
Fundamental Design Methogology for Geothermal Energy Extraction -Establishment of Fractal Fracture Mechanics and Its Application-

NAKATSUKA Katsuto, HASHIDA Toshiyuki, YAMASAKI Nakamichi, HAYASHI Kazuo, TAKAYASU Hideki, YUSA Yuki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Priority Areas

Institution: Tohoku University

1993 - 1995

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The objective of the present research program is to develop a numerical model for predicting long-term performance of thermal extraction from geothermal reservoirs. The research program consists of the following major subjects, and three research group (RG) are formed to examine each research subject : (1) Characterization of subsurface natural fracture networks based on fractal geometry (RG : A01) (2) Modeling of mechanical responses of fracture-type rock mass stimulated by hydraulic fracturing (RG : A02) (3) Characterization of water-rock interaction (RG : A03) The following results are obtained from the RG activities. Firstly, a fractals-based method has been worked out which allows the generation of a 3D fracture network using a well logging data obtained from the reservoir considered. Then, numerical models have been developed to analyze the mechanical behavior of the geothermal reservoir during hydraulic stimulation process, steady state fluid flow at circulation stage, and heat extraction through the fractured rock mass, based on the generated fractal fracture network and the inputs measurable from field data. The numerical model of hydraulic stimulation allows to take into account the shear displacements of the stimulated fracture as well as the openings at a given treatment pressure, and to calculate the amount of fluid needed to stimulate a given volume of rock. The numerical models allows to predict the shape of the stimulated region, the recovery rate of circulating fluid, and then the long-term temperature variation of produced fluid. Finally, we have established a computer simulation model for predicting long-term performance of thermal extraction from a fracture network type geothermal reservoir, on the basis of the above-mentioned fundamental results. The model has been applied to examine the effect of geothermal reservoir size on the thermal output. International co-operative joint research programs have also been conducted to support the present study. Three international symposia have been held to disseminate our research results in addition to annual research group meeting. Furthermore, we have issued ten news-letters to facilitate the information change within the research groups.
放電プラズマ法を用いた短繊維複合延セラミックスの設計・合成・評価に関する研究

橋田俊之

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 奨励研究(A)

Institution: 東北大学

1994 - 1994

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本研究の目的は、セラミックス系短繊維複合材料を対象に、マイクロメカニックスモデルに基づく材料開発を実施し、マルチプルクラックひずみ硬化特性を有する高靭性セラミックスを創製することである。 1.繊維ブリッジング応力-き裂開口変位の関係に基礎を置く短繊維強化材料設計モデルを構成した。モデルは繊維(寸法,体積含有率,弾性係数),マトリックス(破壊靭性,弾性係数)および界面強度の各パラメータを考慮している。これによりマルチプルクラックの発生条件、ひずみ硬化型材料の応力-ひずみ挙動を推定するモデルを提案した。 2.放電プラズマ法により、以下の4種のセラミックスを燒結した結果、50MPaの加圧力、5minの加熱時間でSiCでは1800℃、ZrO_2,Al_2O_3,Si_3N_4では1600℃の温度で、いずれも燒結助剤を添加することなく、理論密度100%の緻密な固化体を得た。固化体の高温強度評価をスモ-ルパンチ試験法により実施した結果、通常のホットプレス法による燒結で作成した固化体よりも耐熱性に優れていることを見いだした。1500℃で最大2倍程度の強度を保持している。これにより、燒結助剤無添加の高温強度特性に優れたセラミックスの迅速な合成ルートを開発した。 3.金属間化合物繊維の合成を目的に、Ni_3Alの放電プラズマ燒結実験を実施した結果、50MPaの加圧力、10minの加熱時間、1850℃の温度で緻密な固化体を得た。3点曲げ試験により、室温においても延性挙動を呈することを確認し、上記2で作成したセラミックスをマトリックス、本金属間化合物を繊維として複合化できる見通しを得た。今後、設計モデルを基礎に、さらに金属間化合物繊維複合セラミックス材料の完成を目指す。 4.1に記した材料設計モデルの妥当性を検討するために、化学的セラミックの代表例であるケイ酸カルシウム(ゾノトライト)複合材料を水熱ホットプレス低温合成法で製作した。用いた繊維はポリエチレン(アスペクト比:500)である。体積含有率0.7%でマルチプルクラックを誘起することができ、ひずみ硬化型高靭性材料の開発に成功するとともに、構成したモデルの予測と調和的であることを確認した。本研究により、マルチプルクラックひずみ硬化型高靭性複合材料の設計モデルが開発できたといえる。
マルチプルクラックひずみ硬化挙動を利用した延性セラミック,ガラスの開発

橋田俊之

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 奨励研究(A)

Institution: 東北大学

1993 - 1993

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本研究は、短繊維複合によりマトリックスにマルチプルクラックを誘起し、準ひずみ硬化特性を有する素材を開発することが目的であり、素材の合成技術の開発に加えて、特に材料微視組織と巨視的破壊特性をリンクしたマイクロメカニックスに立脚した材料開発手法に関する研究を行った。破壊力学的結合力モデルに立脚し、繊維ブリッジング応力-き裂開口変位関係に基づく材料設計モデルを鋼製した。これによりマルチプルクラックを誘起するための適切な繊維パラメータ(寸法、剛性、含有率)とマトリックスパラメータ(靱性、剛性)及び界面強度の条件を決定する手法を考案した。本研究では、セラミック、ガラス系マトリックスとして、ゾノトライト、コンクリート、発泡ガラスを対象とした。またゾノトライトには種々のポリマー繊維、コンクリート、発泡ガラスにはスチール製繊維を強化要素として用いた。脱水成形により作成したゾノトライト複合材料、および水熱ホットプレス法によるコンクリート複合材料では、上述の設計モデルで予測される条件を満足する合成技術が開発でき、4点曲げ試験および破壊靱性試験によりマルチプルクラックを誘起することができることを確認した。開発された素材は顕著な延性的挙動を示しマルチプルクラックによるひずみ硬化特性を発現させることができた。本手法により合成した素材は、木材の強度、靱性を越えるものであり、木材代替の計量素材としても期待される。とくに、マルチプルクラックを発生させることで変形性能を格段に向上させ得ることがわかった。発泡ガラスについては、強度はマトリックスの2倍、靱性は300倍まで向上したものの、現在の合成技術によっては用いることのできる繊維アスペクト比、含有率に大きな限界があり、繊維のブリッジングのみによる特性の向上にとどまった。しかしながら、より耐熱性にすぐれた高強度鋼を選択できればマルチプルクラックの誘起が可能であることをモデルにより示し、将来の指針を得た。本研究の遂行により、短繊維複合による脆性材料の高靱化のための材料開発手法の基礎が構成されたといえる。
Characterization of the Subsurface Fracture Network by Means of Crystal Fracture Mechanics and Crystal Stress Study

TAKAHASHI Hideaki, SAMMONDS Peter R., GLOVER Paul W.J., WATANABE Kimio, TAKAYASU Misako, SATO Kazushi, TSUCHIYA Norimasa, HASHIDA Toshiyuki, TAKAYASU Hideki, HAYASHI Kazuo, MATSUKI Kouji, MEREDITH Philip G.

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Overseas Scientific Survey.

Institution: Tohoku University

1993 - 1993

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The observed fractal nature of both fault length distributions and earthquake magnitude-frequency distribution suggests that there may be a relationship between the structure of active fault systems and the resulting seismicity. Here, we present the first experimental evidence for a correlation between the fractal dimension of fracture length distribution D and acoustic emission (AE) b-value based on a series of tensile fracture mechanics tests on crystalline rock, carried out in different environmental conditions, both air-dry and water-saturated at ambient temperature and pressure. The constant stress intensity, K_I, and quantitative analyses of the resulting fracture patterns were carried out on the same specimens. It is found that AE b-values, ranging from 1.0 to 2.3, correlate negatively with normalized stress intensity K_I/K_<IC>, where K_<IC> is the fracture toughness of the specimen. The fractal dimension of fracture length distribution D, ranges from 1.0 to 1.7. Fluid presence has a first-order influence on both the AE and structure produced in these experiments. For experiments at low stress intensity or high fluid content, the activation of the stress corrosion mechanism for K_I < K_<IC> leads to a greater relative proportion both of small cracks and of low amplitude acoustic emissions, reflected in higher values of D and b. The fractal dimension D is found to correlate positively with the AE b-value.
Co-operative Study on a New Rock Fracture Mechanics based on Fractal Geometry

TAKAHASHI Hideaki, TAKAYASU Hideki, ITO Keisuke, HASHIDA Toshiyuki, MATSUKI Kouji, ABE Hiroyuki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Co-operative Research (A)

Institution: Tohoku University

1992 - 1993

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The observed fractal nature of both fault length distributions and earthquake magnitude-frequency distribution suggests that there may be a relationship between the structure of active fault systems and the resulting seismicity. Here, we present the first experimental evidence for a correlation between the fractal dimension of fracture length distribution D and acoustic emission (AE) b-value based on a series of tensile fracture mechanics tests on crystalline rock, carried out in different environmental conditions, both air-dry water-saturated at ambient temperature and pressure. The constant stress intensity, K_I, and quantitative analyzes of the resulting fracture patterns were carried out on the same specimens. It is found that AE b-values, ranging from 1.0 to 2.3, correlate negatively with normalized stress intensity K_I/K_<IC>, where K_<IC> is the fracture toughness of the specimen. The fractal dimension of fracture length distribution D, ranges from 1.0 to 1.7. Fluid presence has a first-order influence on both the AE and structure produced in these experiments. For experiments at low stress or high fluid content, the activation of the stress corrosion mechanism for K_I<K_<IC> leads to a greater relative proportion both of small cracks and of low amplitude acoustic emissions, reflected in higher values of D and b. The fractal dimension D is found to correlate positively with the AE b-value.
Characterization of the Subsurface Fracture Network by Means of Fractal Fracture Mechanics and Stress Studies

TAKAHASHI H., WATANABE K., MEREDITH P.G., P.R.SAMMONDS, P.W.J.GLOVER, TAKAYASU H., SATO K., TSUCHIYA N., HAYASHI K., HASHIDA T., MATSUKI K., C.E.STUART

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Overseas Scientific Survey.

Institution: Tohoku University

1992 - 1992

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The thermal output of geothermal power plants has been limited so much because of few information on subsurface cracks, which behave as fluid path or heat exchanging surfaces. this project aims at developing a new methodology for design of advanced geothermal energy extraction system based on "Fractal Fracture Mechanics". A study on "Fractal Fracture Mechanics" has a multidisciplinary aspect ranging from geophysics and geology to mechanical and resources engineering. "Fractal Fracture Mechanics" includes multi-crack characterization of subsurface fracture networks, modelling of heat and mass transfer through the heat exchanging surfaces, and alternation process of reservoir rocks.
Development of Evaluation Methods for Thermal Stress Relief Type Ceramic Coating Design

TAKAHASHI Hideaki, YAMASAKI Nakamichi, TAMAKAWA Kinji, HASHIDA Toshiyuki, HAYASHI Kazuo, SHOJI Tetsuo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Developmental Scientific Research (B).

Institution: Tohoku University

1989 - 1990

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The objective of this research is to develop methods for evaluating thermal stress relief type ceramic coatings on the basis of transient thermal stress analyses. This study especially focuses on the development of functionally gradient materials ( FGMs ). The following evaluation and analysis methods were developed for evaluating the thermal shock resistance of FGMs in this study. (1) Evaluation of mechanical properties of constituent materials ( Small punch testing method ) In order to determine the optimum microstructure of FGMs under the thermal environment, the mechanical properties as a function of the mixture ratio of the component are required for the materials design. For this purpose, the small punch ( SP ) method was developed for determining the elasticity modulus and fracture properties using a thin, miniaturized specimen ( 0.5*10*10mm ). By use of the SP method a material properties data base was established for SiC/C and ZrO_2/metal composiltes. (2) Computer simulation method for evaluating transient thermal stress using a finite element method Transient thermal stress analyses were conducted on several FGMs such as SiC/C and ZrO_2/metal coating systems under the thermal environments of their applications. The analyses were also performed to simulate the test of laser heating in order to facilitate the fabrication- evaluation loop. Using the simulation method, the effect of varying the gradient microstructure on the transient thermal stresses was examined. (3) Thermal shock resistance evaluation method ( Laser and plasma-arc heating technique ) Laser and plasma-arc heating methods supplemented by the transient thermal stress analysis were developed to evaluate the thermal shock resistance of FGMs. The tests demonstrated the usefulness of FGMs to mitigate the induced thermal stress within the ceramic coating materials.
Fracture Mechanics Study on Process Zone in Brittle-Microcracking Materials

ABE Hiroyuki, HASHIDA Toshiyuki, DATE Kazuhiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for General Scientific Research (C)

Institution: Tohoku University

1988 - 1989

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The objective of this research is to develop a fracture mechanics model for characterizing the process zone growth in brittle-microcracking materials. A microcracking fracture process zone is known to accompany tensile macrocrack propagation in quasi-brittle materials such as rock, concrete and ceramics. The fracture process zone is suggested to be largely responsible for the dependence of fracture mechanics data on the specimen size and geometry. In this study, we examine the fracture process of granites. An ultrasonic timing method was employed to detect the extent of the process zone during fracture toughness tests of granites. The travel time of longitudinal waves propagating through fractures was monitored using 500-kHz transducers with a commercially available equipment. It was demonstrated that the travel time technique can locate the tip of the process zone continuously during fracture experiments. The ultrasonic wave measurements revealed that the process zone length is not a material property but dependent on specimen size, indicating the importance of characterizing the process zone growth for the fracture toughness evaluation. The tension-softening model is chosen to describe the development of the process zone in the granites. The J-based technique, which has recently been proposed by Li et al. for concrete, was used to determine the tension-softening curve. A boundary element analysis was carried out to simulate the process zone growth in the fracture toughness specimens based on the tension-softening relation. The growth behavior of the process zone observed by the ultrasonic method was shown to agree with the results of numerical analysis. This supports the use of the tension-softening model to characterize the process zone growth in the granites. A method was developed for determining the critical J-integral value, Jc on the basis of the process zone length, and the measured Jc values were compared with those obtained by Li's proposed multiple-specimen technique. It was shown that the present method permits a valid fracture-toughness value to be evaluated by use of a single fracture specimen.
Development of Miniaturized Specimen Technique for Evaluating Stress Corrosion Cracking Suspeptibility

TAKAHASHI Hideaki, NAKAJIMA Hajime, MISAWA Toshihei, TAMAKAWA Kinji, HASHIDA Toshiyuki, SHOJI Tetsuo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Co-operative Research (A)

Institution: TOHOKU UNIVERSITY

1988 - 1989

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The small specimen test technique (SSTT) combined with electrochemical measurements for irradiated miniaturized specimens has been developed to evaluate the resistance to stress corrosion cracking (SCC) and corrosion of fusion reactor structural steels in water-coolant environment under irradiation. Two newly developed apparatus for a small punch (SP) testing and a slow-strain-rate test (SSRT) using miniaturized specimens in high temperature and high pressure aqueous solutions under applied potential conditions were successfully demonstrated for Type 304 austenitic and HT-9 ferritic stainless steels. Anodic polarization curves were measured and SP fracture energies of stress corrosion were obtained as a function of potential and strain rate. SP-SCC tests using small specimens showed that sensitized Type 304 steel had the susceptibility zones to SCC at the regions of corrosion potential and transpassive potential, whereas the solution-annealed Type 304 and HT-9 steels had the potential independence of SP energies without lowering by the stress corrosion. Surface films were examined by scanning electron microscope, Auger electron spectroscopy and laser Raman spectroscopy. There was the relationship between nature of surface films and SCC susceptibility. The strain rates smaller than 1.5x10^<-6> s^<-1> were necessary for a significant reduction of the elongation required for intergranular stress corrosion of sensitized Type 304 steel in the SSRT using miniaturized tensile specimens. The strain rate value that brought about the highest SCC susceptibility in sensitized Type 304 steel was larger than that of the popular SSRT using the uniaxial tensile specimens because of the stronger bulge deformation in SP tests. The SP-SCC test may therefore develop as a rapid and useful stress-corrosion testing method using small specimens in order to evaluate the SCC resistance of irradiated materials in high temperature water environments.
DEVELOPMENT OF DIAGNOSIS PROCEDURE OF MATERIALS DEGRADATION BY MEANS OF NONDESTRUCTIVE ELECTROCHEMICAL TECHNIQUE FOR REMAINING LIFE PREDICTION

SHOJI Tetsuo, HASHIDA Toshiyuki, TANAKA Takashi, SAITO Kiyoshi, SAITO Yoshihisa, OKU Tatsuo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Developmental Scientific Research

Institution: TOHOKU UNIVERSITY

1987 - 1989

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A NEW EVALUATION PROCEDURE FOR DETECTION AND DIAGNOSIS OF MATERIALS DEGRADATION OF HEAT RESISTANT MATERIALS WAS DEVELOPED WHICH HAS BEEN REQUIRED TO BE DEVELOPED FOR ENSURING THE STRUCTURAL SAFETY AND INTEGRITY OF COMPONENTS USED FOR A LONG TERM IN SERVICE. THE BASIC MECHANISMS OF DAMAGE DETECTION IS APPLICATION OF ELECTROCHEMICAL TECHNIQUE SUCH AS ANODIC POLARIZATION MEASUREMENTS AND IMPEDANCE SPECTROSCOPY MEASUREMENT FOR EVALUATION OF MICROSTRUCTURAL CHANGES CAUSED DURING THE SERVICE TIME AT ELEVATED TEMPERATURE. THE MATERIALS USED IN THIS INVESTIGATION ARE AUSTENITIC STAINLESS STEELS, Cr-Mo-V STEELS AND Cr-Mo STEELS WHICH ARE COMMONLY USED AS BOILER SUPERHEATER, TURBINE ROTORS AND CASING, REACTOR OF CHEMICALPLANTS AND BOILER HEADER. THE RESULTS CAN BE SUMMARIZED AS FOLLOWS, 1. EMBRITTLEMENT AND REDUCTION OF CREEP RESISTANCE OF SUS 321 and 316 DUE TO SIGMA PHASE FORMATION AND CARBIDE PRECIPITATION CAN BE DETECTED BY POLARIZATION MEASUREMENT IN KOH SOLUTION. 2. A SOLUTION FOR DETECTION OF TEMPER EMBRITTLEMENT OF Cr- Mo- V STEELS IS DEVELOPED WITH A VERY HIGH SENSITIVITY RATHER THAN PICRIC ACID SOLUTION. 3. A DETECTION SOLUTION WAS DEVELOPED FOR SELECTIVE DETECTION OF M6C CARBIDES WHICH CAUSE THE VARIOUS DETERIORATION SUCH AS SOFTNING, CARBIDE EMBRITTLEMENT ETC. 4. DEVELOPMENT OF GELL ELECTRODE, SMALL ELECTOCHEMICAL CELL AND HANDY TYPE POTENTIOSTATT WERE ACHIEVED FOR THE IN-SITU MEASUREMENTS AT THE PLANTS. 5. DEVELOPMENT OF DATA BASE FOR THE SYSTEMATIC PROCEDURE TO DETECT THE VARIOUS TYPE OF DEGRADATION AND THEIR STANDARIZATION.
岩石、コンクリート、セラミックスの破壊靭性評価に関する研究 Competitive

1985/04 - 1988/03

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Social Activities 35

文部科学省・先端研究基盤共用・プラットフォーム形成事業「社会の安全・安心のための先端的経年損傷計測・評価と破壊制御」

2016/04/01 - 2017/03/31

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課題選定評価委員会委員
文部科学省・先端研究基盤共用・プラットフォーム形成事業「社会の安全・安心のための先端的経年損傷計測・評価と破壊制御」

2014/04/25 - 2015/03/31

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課題選定評価委員会委員
第11回国際ナノテクノロジー総合展・技術会議における展示

2012/02/15 - 2012/02/17

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カーボンナノチューブ/アルミナ複合材料の作製と評価に関する研究成果を展示した．
「第１０回国際ナノテクノロジー総合展・技術会議」出展

2011/02/16 - 2011/02/18

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開発したカーボンナノチューブ配合セラミックス複合材料の展示をした．
仙台市民公開講座

2010/07/17 - 2010/07/18

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「環境とエネルギーの安全科学」ー地球と人に優しいエネルギーの供給と維持を目指してー
公開講座「エネルギー環境学特論」

2009/08/04 - 2009/08/06

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平成２１年度公開講座・特論「エネルギー環境学特論」，東北大学環境科学研究科主催
新規開発したSOFC評価試験装置の展示・広報

2009/02/25 - 2009/02/27

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FC EXPO 2009 第5回国際水素・燃料電池展（2009年2月25日−27日,東京ビッグサイト）においてCHINO株式会社と共同開発したSOFC評価試験装置を展示した
「アスベスト対策環境展(ASBEX)'07'」における展示

2007/10/17 - 2007/10/19

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開発した染色法に基づくアスベスト検出技術を展示した．
（社）火力原子力発電技術協会平成１８年度研究発表会

2006/11/30 - 2006/12/01

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プレゼンターション賞審査委員長
産業界主催研究活動紹介

2017/08/08 -

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株式会社高純度化学研究所からの依頼を受けて，「準脆性材料の材料強度学的評価と応用に関する研究」を題目とする招待講演を2017年8月8日に行った．
公開講座「エネルギー資源・環境学」

2015/08/25 -

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エネルギー資源ならびにエネルギー環境に関する話題を，水素エネルギー，地殻エネルギー・物質，ならびに資源リサイクルの観点から講義を行い一般公開した．
東北大学イノベーションフェア2014

2014/01/28 -

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カーボンナノチューブ/アルミナセラミックス複合材料の作製と機械的特性評価に関するブース出展
公開講座「エネルギー環境学特論」

2012/08/02 -

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地熱エネルギーの特色ならびに現状と課題について概説するとともに，増産のための方策について講演する．
東北大学イノベーションフェア

2012/03/15 -

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「クリーン地熱エネルギー増産技術」に関する出展とプレゼンテーション
講演会講師

2010/03/29 -

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ISS産業科学システムズ主催講演会「材料力学入門」講師
A novel structure for carbon nanotube reinforced alumina composites

2008/07/17 -

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インターネット上で，カーボンナノチューブ(CNT)を表面修飾し，ナノ欠陥ならびに表面電位を調整することにより，CNTをアルミナマトリックス中で一様に分散させ，かつ強度・靱性を飛躍的に増大させた複合材料を作製することに世界で初めて成功た．
CNTs reinforce alumina composites

2008/07/17 -

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インターネット上（Nanotechweb.org）で，カーボンナノチューブ(CNT)を表面修飾し，ナノ欠陥ならびに表面電位を調整することにより，CNTをアルミナマトリックス中で一様に分散させ，かつ強度・靱性を飛躍的に増大させた複合材料を作製することに世界で初めて成功た．
Spying asbestos

2008/02/23 -

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東北大学の橋田俊之教授らのグループは、建材などが石綿（アスベスト）を含むかどうかを現場で短時間に検査できる試薬を開発したと発表した。判定に要する時間は1時間ほど。石綿を含むスレートや石こう板などに試薬を付けると、石綿の部分だけが赤か青か黄色に染まる。染まる色は、建材の色と比べて目立つように、3色のなかから1色を選べる。白石綿（クリソタイル）、茶石綿（アモサイト）、クロシドライト（青石綿）と3種類ある石綿のうち、白石綿だけを検知の対象としている。
独立行政法人科学技術振興機構新技術説明会ミナノメカニックスが拓く機能創成と制御-

2007/06/08 -

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大学初のライセンス可能な特許を発表「カーボンナノチューブを利用したセラミックス基複合材料の製造方法」
アスベスト簡易染色

2007/02/27 -
Development of On-Site Technology for Quick and Easy Detection of Asbestos Succeeded

2007/02/25 -
アスベストをスピード検出東北大が新技術費用も安く

2007/02/09 -
石綿含有簡単に判別，特殊染料で”赤信号” 東北大グループ検査時間大幅に短縮

2007/02/09 -

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東北大学大学院工学研究科附属エネルギー安全科学国際研究センター橋田俊之教授および尾家慶彦助手らの研究グループは，染料を使用して建材等製品中のアスベストを選択的に染色し，アスベスト（石綿）を短時間で簡単に検出できるオンサイト技術を開発した．本技術は，エックス線などを使用する従来の検査方法と比べ，高度な専門技術や高額な機器を必要とせず低コストで検査が可能となり，簡易な講習程度で検査を実施できるため，一般家屋など広範囲にわたるアスベスト使用状況の調査に役立つ技術として期待されている．また，試料の粉砕が必要ないため，アスベスト飛散のリスクが抑えられる上，アスベスト存在位置の確認も可能である．
石綿の有無を現場で判定、東北大学のグループが試薬を開発

2007/02/07 -

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東北大学の橋田俊之教授らのグループは、建材などが石綿（アスベスト）を含むかどうかを現場で短時間に検査できる試薬を開発したと発表した。1年以内に携帯用の検知器などの形で製品化することを目指す。判定に要する時間は1時間ほど。石綿を含むスレートや石こう板などに試薬を付けると、石綿の部分だけが赤か青か黄色に染まる。染まる色は、建材の色と比べて目立つように、3色のなかから1色を選べる。白石綿（クリソタイル）、茶石綿（アモサイト）、クロシドライト（青石綿）と3種類ある石綿のうち、白石綿だけを検知の対象としている。今後は、建材に含まれる茶石綿と青石綿の検知や、大気中に浮遊する石綿の検知を可能にする技術の開発にも力を注ぐ方針だ。開発を手がけているのは、同大学の大学院工学研究科付属エネルギー安全科学国際研究センターの橋田教授（センター長）と尾家慶彦助手、大学院環境科学研究科の元教授の山崎仲道氏と、マエタテクノ
曲がるセメント板高靱性セメント系押出成形材料

2002/08/01 -

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原料の配合比率，使用すべき補強繊維を最適化し，セメント系押出成形材料の高靱性化を実現した．
”曲がる”セメ系押出成形材料 -耐震補強，衝撃吸収部材に-

2002/06/17 -

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ひび割れが生じても直ちに破壊せず，大きな変形能力を示し，耐震補強部材や衝撃吸収部材にして利用できる素材を開発した．
高靱性セメント繊維複合材中空形状の成型可能土木，住宅外装材向け

2002/06/11 -

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異形押出成形法により高靭生セメント繊維複合材料を開発した。中空形状の成形が可能で、大幅な軽量化を図れるのが特徴。土木資材の型枠や耐震補強材料、住宅用外装材・床材、通信ケーブルのハウジング材料向けの用途開発を目指す。
強度を維持するセメント系建材

2002/06/11 -

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ビニロン繊維を複合化した耐震補強材や住宅外装材用の建築素材を押し出し成形により作製し、2003年度に実用化を目指している。
セメント繊維複合材料歪み強度が１０倍超

2002/06/11 -

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き裂やひび割れが広がりにくく、耐震性や耐衝撃強度に優れる高靭生のセメント繊維複合材料を押出成形法により作製した。
耐ひずみ性１０倍以上セメント系押出成形材料

2002/06/11 -

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一般のコンクリートに比べ強度で2倍、耐ひずみ性で10倍以上の特性をもつ繊維強化セメント系押し出し成形材料を開発した。
創造技術コンクリ，ガラス廃材を建材に東北大，太平洋セメント子会社などが再利用技術

2001/08/01 -

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処分場不足に悩む埋め立て廃材の利用を目的として、コンクリート廃材とガラス廃材を建築パネル等として再利用するための二酸化炭素固化法を開発した。
耐熱性高い複合セラミックス開発加工性に優れ，低い熱膨張係数も兼備

1997/02/17 -

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優れた低熱膨張性、断熱性、加工性を同時に有するセラミックス「リチウムアルミノケイ酸塩系セラミックスアドセラム-CS」を開発した。用途には，耐熱衝撃性を生かした熱処理ジグ類や，熱膨張係数がちいさいことから精密成型型やエアスライダなどが検討され，一部採用され始めている．
熱膨張少なく断熱性セラミックス複合材開発

1997/02/14 -

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多機能セラミックス「リチウムアルミノケイ酸塩系セラミックスアドセラム-CS」を開発した。多くの特性を備えている単一素材として，半導体や家電製品分野での活用が見込まれている．
高断熱で耐熱衝撃性もセラ新素材を開発半導体・家電に的

1997/02/13 -

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高断熱で耐熱衝撃性に優れたセラミックス「リチウムアルミノケイ酸塩系セラミックスアドセラム-CS」を開発した。ケイ酸カルシウムをベースとしてリチウムアルミノケイ酸を複合化することにより，断熱性に優れ，かつ耐熱衝撃性にも優れているという相反する性質を持つ新しい素材の開発に成功した．
窒化ケイ素セラミックス耐熱1400℃超を達成ータービン利用に道

1996/12/20 -

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放電プラズマ焼結により耐熱温度1400℃を超える窒化ケイ素セラミックスの作成に成功した

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Media Coverage 2

新たなアスベスト探知法開発

NHK「てれまさむね」

2007/02/26

Type: TV or radio program
Technology for Reuse of Concrete Debris

New Technology Japan, Vol. 29, No. 7, October, 2001, p. 38, 日本貿易振興会(JETRO)

2001/10

Type: Newspaper, magazine

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コンクリート廃材再利用技術、コンクリート廃材を炭酸ガスを用いることにより固化し、コンクリート廃材の再利用と同時に二酸化炭素ガスを同時に固定化するための方法を開拓した。

Other 47

SOFCセルスタック発電時の変形および応力解析技術に関する研究

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SOFCセルスタック発電時の変形および応力評価を目的として，レーザー計測技術を用いた非破壊計測技術を開発する．
地熱貯留層評価・管理技術開発のための注水涵養に伴う貯留層内変動把握に関する研究

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柳津西山地熱貯留層を対象として，不連続き裂を考慮できるトレーサー応答数値シミュレーション法の開発と貯留層評価に関する研究を行う．
固体酸化物燃料電池の機械的特性評価に関する研究

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固体酸化物燃料電池の経年劣化損傷を小型試験法（スモールパンチ試験法）を用いて検出するための研究を行う．経年劣化した積層材料であるSOFC構成材料に対して，AE法を併用した材料強度学的試験法を開発し，劣化損傷を定量的に評価できる方法を提案する．
固体酸化物型燃料電池の基礎と研究開発に関する学術指導

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固体酸化物型燃料電池(SOFC)の基礎と研究開発に関して，一般的な事項とともに最先端の技術の現状について学術指導を行う．
珪酸カルシウム系複合材料の材料強度に関する研究

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珪酸カルシウム系複合材料を対象として，複合材料の作製とその機械的特性の評価に関する研究を行う．
経年火力部材の特性評価に関する研究

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運転時間が３０年を超える火力発電部材においては，室内加速試験に基づく予測結果が必ずしも実時間における損傷度合いを推定できていない場合も経験されており，この乖離については十分検討されていないのが現状である．本研究においては，長期使用された経年火力部材を用いて損傷評価の高度化を目的として，経年損傷メカニズムの解明を行う．実機から直接抽出した経年火力部材を活用し，材料組織学的調査と材料強度学的調査を組み合わせた検討を行い，現実に発生する経年損傷メカニズムを明らかにするとともに，加速試験法による予測結果との詳細な比較検討を行う．
経年火力部材の特性評価に関する研究

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運転時間が３０年を超える火力発電部材においては，室内加速試験に基づく予測結果が必ずしも実時間における損傷度合いを推定できていない場合も経験されており，この乖離については十分検討されていないのが現状である．本研究においては，長期使用された経年火力部材を用いて損傷評価の高度化を目的として，経年損傷メカニズムの解明を行う．実機から直接抽出した経年火力部材を活用し，2009年度には，材料組織学的調査に焦点を当てた検討を行い，現実に発生する経年損傷メカニズムを明らかにする．
ガスタービンTBCシステムの高温損傷発生メカニズムの解明と寿命評価手法の確立

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ガスタービンブレードに施工されるTBCならびにその下地耐熱金属を対象として，TBC/下地金属界面に形成される酸化膜成長に及ぼす応力の影響，ならびに下地金属の組織変化の非破壊評価に関する検討を行い，高温損傷発生メカニズムの解明と寿命評価手法の確立を目指す．
ガスタービンTBCシステムの高温損傷発生メカニズムの解明と寿命評価手法の確立

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ガスタービンブレードに施工されるTBCならびにその下地耐熱金属を対象として，TBC/下地金属界面に形成される酸化膜成長に及ぼす応力の影響，ならびに下地金属の組織変化の非破壊評価に関する検討を行い，高温損傷発生メカニズムの解明と寿命評価手法の確立を目指す．
「固体酸化物形燃料電池システム要素技術開発」耐久性・信頼性向上のための基礎研究 (機械的解析による劣化機構の解明、加速試験方法の確立)

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固体酸化物燃料電池(SOFC)の機械的信頼性を確保することを目的として，劣化メカニズム解明に基づく耐久性評価法の開発を行う．構成材料の弾性特性，強度特性等の評価，AE法等による損傷の非破壊評価，作動状態におけるセルの応力解析を組み合わせた検討を行うことにより，材料強度学に基づくSOFCの機械的信頼性を評価し，耐久性を確保するための学術的基盤を構築している．
薄膜材料・薄膜化技術の開発と固体酸化物燃料電池への応用に関する研究

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固体酸化物燃料電池の開発を目的として，スプレー法により薄膜でかつ緻密な電解質膜の作製法を開発する．出発原料粉の作製方法ならびにスプレー溶液のゲル化法に関する研究，焼成温度などの影響に関する検討などを通して，多孔質材料である電極膜への緻密な電解質コーティング法を開発する．
固体酸化物燃料電池の長期信頼性評価に関する研究

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固体酸化物燃料電池(SOFC)の実用化のためには，長期信頼性の確保が最も重要な検討課題の一つとなっている．そのため，SOFC構成要素・構造の基礎的特性評価法ならびに劣化損傷過程検出法に関する研究を推進し，長期信頼性確保のための学術的基礎を構築する． SP法，インピーダンス法等を有機的に組み合わせたSOFC構成要素・構造の基礎特性評価法，およびAE法等を併用したセル損傷の非破壊検出技術に関する検討を行う．特に，AE法の検討に関しては，セルスタックならびにモジュールへの適用について十分に調査研究を推進する．さらに発生応力解析法の開発と合わせて，劣化メカニズムの解明ならびにこれに基づく長期信頼性評価法の開発を行う．
金属ガラスとセラミックスの接合とその評価に関する研究

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水熱法を活用することにより，金属ガラスと生体活性セラミックスなどのセラミックスとの接合に関する研究を行う．金属ガラスを基材として，前駆体法と水熱法を組み合わせた接合方法を開発する．さらに，界面近傍の化学分析ならびに機械特性評価と行うことにより強度特性に優れた接合体の作製を目指す．
ボーリングコアを用いたISRMせん断型破壊靭性試験法に関する国際共同研究

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岩石破壊力学の専門家を結集させ，2007年までに国際岩の力学会（ISRM）岩石せん断型破壊靱性試験法を提案することを目的とした国際共同研究を行う．具体的には，岩石のせん断型破壊靱性試験法として，ボーリングコアに基づくパンチ—スルーせん断型試験片（Punch-Through Shear Specimens ; PTS）を用いた方法を開発し，ISRM推奨試験法として提案するための学術的基盤を構築するとともに，本試験法を組み込み，かつ多数き裂の相互作用を考慮した混合モード下におけるき裂進展則の評価方法をドイツ国との国際共同研究により構築する．
水溶性塩基染料の吹き付けによるアスベスト有無の簡易判別法

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本研究テーマでは、建材中の含有アスベストをオンサイトで、簡易、迅速に探知、計測できる技術を開発する。このために、水溶性塩基染料の吹き付けによるアスベスト有無の簡易判別技術を開発する。そのため、下記の研究開発項目を実施する。 (1)建材等中のアスベストを選択的に染色する水溶性塩基性染料の選定 (2)オンサイトで探知・計測するトータルシステムに関する検討 (3)実用化に資する導入シナリオとビジネスモデルの策定
水熱条件下での二酸化炭素の有機化合物への変換

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水熱条件下での二酸化炭素の有機化合物への変換
水熱合成による製鉄プロセス副生物の利材化に関する研究

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水熱合成による製鉄プロセス副生物の利材化に関する研究
超臨界水条件下における岩石の環境助長割れに関する基礎的研究 Environmentally assisted cracking in rocks under supercritical water conditions

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超臨界水条件下における岩石の環境助長割れに関する基礎的研究
ナノチューブ、ナノ微粒子、マイクロ微粒子の組織反応性とバイオ応用 Tissue Reaction and Biomedical Application of Nanotubes, Nanoparticles and Microparticles

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ナノチューブ、ナノ微粒子、マイクロ微粒子の組織反応性とバイオ応用
二酸化炭素を含む超臨界水環境下におけるNi基圧力容器用鋼の耐久性評価に関する研究 Durability Evaluation of Ni-Based Pressure Vessel Alloys under CO2-Containing Supercritical Water Environments

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二酸化炭素を含む超臨界水環境下におけるNi基圧力容器用鋼の耐久性評価に関する研究
資源開発のための岩盤破砕プロセスの破壊力学的研究 Prediction of Rock Fracture Process Based on Fracture Mechanics

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資源開発のための岩盤破砕プロセスの破壊力学的研究
ごみ焼却灰の固化法の開発と耐久性評価に関する基礎研究 Solidification and Durability Evaluation of Refuse Incineration Ashes

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ごみ焼却灰の固化法の開発と耐久性評価に関する基礎研究
加熱炉用セラミックス系複合材料の性能評価に関する研究 Evaluation of High Temperature Performances of Ceramic Fiber Composites for Heating Furnaces

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加熱炉用セラミックス系複合材料の性能評価に関する研究
ごみ焼却灰の固化法の開発とその機械的特性の評価に関する基礎研究 Solidification and Mechanical Evaluation of Refuse Incineration Ashes

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ごみ焼却灰の固化法の開発とその機械的特性の評価に関する基礎研究
珪酸カルシウム系複合多結晶体の水熱合成とその利用 Hydrothermal Synthesis of Calcium Silicate Composite Materials and Their Application

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珪酸カルシウム系複合多結晶体の水熱合成とその利用
鉄鋼スラグの固化とその利用に関する研究 Solidification of Steelmaking Slag by Mechanochemical Method and its Application

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鉄鋼スラグの固化とその利用に関する研究
水圧破砕による断裂型地熱貯留層の拡大と性能評価のための数値シュミレーションに関する研究 –Fracsim-3Dの確立- Numerical Simulation of the Fractured Type Reservoir Formation by Hydraulic Stimulation

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水圧破砕による断裂型地熱貯留層の拡大と性能評価のための数値シュミレーションに関する研究 –Fracsim-3Dの確立-
自動車部材廃材のマテリアルリサイクル法に関する研究 Development of Recycling Method for Automobile Wastes

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自動車部材廃材のマテリアルリサイクル法に関する研究
複雑な地下き裂分布推定のためのコンピュータシミュレーションコードの開発 Development of Numerical Model for Predicting Complex Subsurface Fracture Systems

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複雑な地下き裂分布推定のためのコンピュータシミュレーションコードの開発
抵抗加熱法によるTBCの剥離・亀裂の破壊力学的評価 Fracture Mechanics Study of Delamination and Spallation in Thermal Barrier Coatings

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抵抗加熱法によるTBCの剥離・亀裂の破壊力学的評価
超臨界水環境下における岩石のすべり軟化とクラックシーリングに関する破壊力学的研究 Fracture Mechanics Study of Slip Weakening and Crack Healing in Rocks under Supercritical Water Environments

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超臨界水環境下における岩石のすべり軟化とクラックシーリングに関する破壊力学的研究
地熱貯留層評価・管理技術に関する研究 Assessment and Management Technology for Geothermal Reservoirs

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地熱貯留層評価・管理技術に関する研究
コンクリートおよびガラスビン廃材のリサイクルと資源化技術に関する研究

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コンクリートおよびガラスビン廃材のリサイクルと資源化技術に関する研究
廃ガラスの再利用技術の開発と高機能化に関する研究

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廃ガラスの再利用技術の開発と高機能化に関する研究
建築用鋼材の局所靭性値の評価法の研究 Study on Evaluation Procedure of Local Fracture Toughness of Steels for Building Construction

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建築用鋼材の局所靭性値の評価法の研究
ケイ酸カルシウム系材料ならびにその建材廃材の炭酸硬化技術に関する研究 Study on Carbon Dioxide Technique for Solidifying Concrete Wastes

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ケイ酸カルシウム系材料ならびにその建材廃材の炭酸硬化技術に関する研究
未来開拓学術研究推進事業「未来型地殻エネルギー抽出の研究」Research for the Future Program Investigation on Design Methodology of Supercritical Subsurface Boiler for Next Generation Geothermal Energy Extraction

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未来開拓学術研究推進事業「未来型地殻エネルギー抽出の研究」
繊維補強セメント系準脆性材料の押出成形技術の開発に関する研究 Investigation on Development of Extrusion Production Method for Fiber-Reinforced Cementitious Materials

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繊維補強セメント系準脆性材料の押出成形技術の開発に関する研究
材料強度に関する研究 Study on Materials Strength

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材料強度に関する研究
地熱貯留層評価・管理技術に関する研究 Study on Evaluation and Control of Geothermal Reservoirs

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地熱貯留層評価・管理技術に関する研究
無機質複合材料の機械的特性評価に関する研究 Investigation on Evaluation of Mechanical Properties of Inorganic Composites

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無機質複合材料の機械的特性評価に関する研究
SP試験法による建築用鋼材の破壊靭性の評価試験 Toughness Evaluation of Steels for Building Construction by SP Method

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SP試験法による建築用鋼材の破壊靭性の評価試験
材料強度に関する研究 Study on Materials Strength

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材料強度に関する研究
高効率ガスタービンの寿命評価技術に関する研究 Investigation on Life-Prediction for High Efficiency Gas Turbines

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高効率ガスタービンの寿命評価技術に関する研究
ポストテンション構造物の緊張材定着部の挙動とその解析および設計に関する研究 Study on Analysis and Design of Joint Parts in Post-Tension Structures

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ポストテンション構造物の緊張材定着部の挙動とその解析および設計に関する研究
珪酸カルシウム系材料の高強度・強靭化 Strengthening and Toughening of Calcium Silicate Materials

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珪酸カルシウム系材料の高強度・強靭化
水熱技術を利用した無機系材料の製造、評価に関する研究 Investigation on Production and Evaluation of Inorganic Materials Using Hydrothermal Technique

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水熱技術を利用した無機系材料の製造、評価に関する研究

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