Details of the Researcher

PHOTO

Seishiro Matsubara
Section
Graduate School of Engineering
Job title
Associate Professor

Research History 3

  • 2025/04 - Present
    Tohoku University

  • 2020/04 - 2025/03
    Nagoya University　Department of mechanical and aerospace engineering　Assistant Professor

  • 2018/04 - 2020/03
    Tohoku university　Department of civil engineering　Assistant Professor

Education 3

  • Tohoku university　Department of civil engineering

    2015/04 - 2018/03

  • Tohoku university　Department of civil engineering

    2013/04 - 2015/03

  • Gifu university　Faculty of engineering　Mathematical and Design Engineering

    2009/04 - 2013/03

Professional Memberships 5

  • 土木学会

  • 日本材料学会

  • 日本計算数理工学会

  • THE JAPAN SOCIETY OF MECHANICAL ENGINEERS

  • THE JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE

Research Interests 6

  • 材料力学

  • 繊維強化複合材料

  • 高分子材料

  • 熱力学

  • 連続体力学

  • 計算力学

Research Areas 2

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

  • Informatics / Computational science / Computational mechanics

Awards 8

  1. 第73 期日本機械学会東海支部総会・講演会 ベストプレゼンテーション賞

    2024/03　日本機械学会

  2. 第26回計算工学講演会 若手優秀講演フェロー表彰

    2022/01　日本計算工学会

  3. 日本材料学会第71期学術講演会優秀講演発表賞

    2020/05　日本材料学会

  4. 平成30年度建設工学研究奨励賞

    2019/06　建設工学研究振興会

  5. 平成30年度日本計算工学会博士論文賞

    2019/05　日本計算工学会

  6. 平成30年度日本機械学会賞（論文）

    2019/04　日本機械学会

  7. 平成27年度応用力学論文奨励賞

    2016/05　土木学会 応用力学委員会

  8. 20周年記念JSCESスカラーシップアワード （WCCM XII & APCOM VI - student travel award）

    2016/04　日本計算工学会

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Papers 46

  1. Computational and physical aspects for the occurrence of crease in an elastomer under general loading conditions Peer-reviewed

    Matsubara, S, Ogino, A, Nagashima, S, Okumura, D

    INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES　288　2024/02/01

    Publisher: International Journal of Solids and Structures

    DOI： 10.1016/j.ijsolstr.2023.112610 　

    ISSN： 0020-7683

    eISSN： 1879-2146

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    We study the occurrence of crease in an elastomer under three loading conditions from both computational and physical points of view. A two-dimensional finite element analysis, including a perturbation force-based approach, is performed to detect the stable creased state, where the crease formation is completed. A mesh convergence study for the energy release and crease depth in the creased state provides a guideline for the finite element mesh requisite for predicting the occurrence of crease. We also visualize the mesh convergence for the critical creasing onset by plotting the set of compressive strain and mesh resolution at the point where the energy release is zero. In addition, the present evaluation method of the surface tension using the energy release and surface area change for an elastomer with a traction-free surface yields a good prediction for the creasing onset delayed by surface tension without additional numerical implementations or adjustment parameters. This facilitates the comprehensive study of the creasing onset delayed by the surface tension under general loading conditions. The results reveal that tensile deformation in the out-of-plane direction encourages the retardation of the creasing onset via the extension of the width and the energy emission. We further demonstrate that energetically preferential crease interval can be used to evaluate the spacing between creases delayed by moderate surface tension.

  2. Surrogate modeling for the homogenization of elastoplastic composites based on RBF interpolation Peer-reviewed

    Yamanaka, Y, Matsubara, S, Hirayama, N, Moriguchi, S, Terada, K

    COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING　415　2023/10/01

    Publisher: Computer Methods in Applied Mechanics and Engineering

    DOI： 10.1016/j.cma.2023.116282 　

    ISSN： 0045-7825

    eISSN： 1879-2138

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    We propose a new framework for creating a surrogate model of computational homogenization for elastoplastic composite materials that serves as a homogenized constitutive law for decoupled two-scale analysis. Two key ingredients of the proposed surrogate modeling are the introduction of a variable representing the macroscopic strain history along with the macroscopic strain and the application of radial basis function (RBF) interpolation. Not only the coefficients of the RBF but also the type of its function form are considered hyperparameters and are determined by applying an optimization algorithm. In the offline process, numerical material tests (NMTs) are performed on a unit cell consisting of multiple elastoplastic materials subjected to various patterns of macroscopic strain to create a database that stores the discrete relationships between variables representing macroscopic deformation states with the macroscopic stresses. Then, RBF interpolation is applied to represent the macroscopic stress in a continuous function with these input data as independent variables. In the online process, this function is used as a macroscopic constitutive law in the macroscopic analysis, which can be followed by localization analysis using an arbitrary macroscopic strain history if necessary.

  3. Bio-Inspired Instability-Induced Hierarchical Patterns Having Tunable Anisotropic Wetting Properties Peer-reviewed

    Nagashima, S, Suzuki, K, Matsubara, S, Okumura, D

    ADVANCED MATERIALS INTERFACES　10　(14)　2023/05

    Publisher: Advanced Materials Interfaces

    DOI： 10.1002/admi.202300039 　

    ISSN： 2196-7350

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    This paper introduces a method for the bottom-up fabrication of bio-inspired hierarchical patterns having tunable anisotropic wetting properties. The method exploits the surface instability of bilayers comprising a gold nanofilm attached to a substantially prestretched elastomer substrate. Upon film formation, highly aligned wrinkles spontaneously form on the surface owing to the surface instability driven by the compressive residual stress in the film. Thereafter, uniaxial compressive strain is applied to the film by prestretch relaxation of the substrate, which generates an array of high-aspect-ratio ridges on the surface. Consequently, hierarchical patterns comprising unidirectionally aligned ridges covered with wrinkles are obtained. Water droplets placed on surfaces having the aforementioned hierarchical patterns show direction-dependent contact angles, resulting in elongated shapes, which indicates the presence of anisotropic wetting properties. The magnitude of wetting anisotropy can be tuned by simple control of the applied compressive strain and film thickness.

  4. A method of fully implicit coupled analyses for thermoset resin subjected to cure based on variationally consistent formulation for finite thermo-viscoelasticity Peer-reviewed

    Yamanaka, Y, Matsubara, S, Moriguchi, S, Terada, K

    INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES　268　2023/04/15

    Publisher: International Journal of Solids and Structures

    DOI： 10.1016/j.ijsolstr.2023.112161 　

    ISSN： 0020-7683

    eISSN： 1879-2146

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    A variationally consistent formulation is presented to devise a method of fully implicit analysis for predicting thermo-mechanically coupled behavior of thermosetting resin subjected to cure in finite strain theory. To characterize the finite thermo-viscoelasticity coupled with cure kinetics, the dual dissipation potential (DDP) is originally defined in the thermodynamically consistent formulation, which begins with the definition of stored energy. The governing equations are derived as stationary conditions of the relevant total energy rate potential containing internal energy, and viscous and curing DDPs, and then discretized in time and space in order. In the temporal discretization process within a time interval, we utilize the function form of the equilibrium temperature obtained from the Legendre–Fenchel transformation of internal energy. The obtained time discretized equations are spatially discretized by means of the standard finite element method. The present formulation results in a fully implicit algorithm with separate systems of governing equations that can be solved in a monolithic manner. Two representative numerical examples are presented to demonstrate that, while allowing relatively large time increments, the devised analysis method provides a more realistic prediction than the previous method formulated within the framework of small strain theory.

  5. Gradient damage model for ductile fracture introducing degradation of damage hardening modulus: implementation and experimental investigations Peer-reviewed

    Han, JK, Matsubara, S, Nishi, S, Takada, K, Muramatsu, M, Omiya, M, Ogawa, K, Oide, K, Kobayashi, T, Murata, M, Moriguchi, S, Terada, K

    INTERNATIONAL JOURNAL OF FRACTURE　240　(2)　183-208　2023/04

    Publisher: International Journal of Fracture

    DOI： 10.1007/s10704-022-00681-9 　

    ISSN： 0376-9429

    eISSN： 1573-2673

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    This study presents a gradient damage model for ductile fracture, in which the damage hardening modulus is degraded by the accumulation of plastic deformation and the volume expansion caused by negative hydrostatic pressure. The proposed model fulfills the thermodynamic requirements, and the governing equations are derived from energy minimization principles. Two parameter studies are carried out to confirm the basic performance of the proposed model, in which some typical ductile fracture responses are demonstrated by changing parameters for degrading the damage hardening modulus. Also, a series of numerical experiments are presented to reveal the ability of the proposed model to successfully simulate the fracture tests of advanced high strength steel sheets with different tensile strengths. It is indeed confirmed by the close agreement with experimental results that the proposed model is capable of realizing the breaking elongation, the transitional behavior from unstable to stable crack propagations, and the corresponding load–displacement curves. Also, the model successfully reproduces and predicts the crack initiation positions in notched specimens with different notch radii.

  6. Self-Wrinkling in Polyacrylamide Hydrogel Bilayers Peer-reviewed

    Nagashima, S, Akamatsu, N, Cheng, XF, Matsubara, S, Ida, S, Tanaka, H, Uchida, M, Okumura, D

    LANGMUIR　39　(11)　3942-3950　2023/03/21

    Publisher: Langmuir

    DOI： 10.1021/acs.langmuir.2c03264 　

    ISSN： 0743-7463

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    Swelling of a gel film attached to a soft substrate can induce surface instability, which results in the formation of highly ordered patterns such as wrinkles and folds. This phenomenon has been exploited to fabricate functional devices and rationalize morphogenesis. However, obtaining centimeter-scale patterns without immersing the film in a solvent remains challenging. Here, we show that wrinkles with wavelengths of up to a few centimeters can be spontaneously created during the open-air fabrication of film-substrate bilayers of polyacrylamide (PAAm) hydrogels. When the film of an aqueous pregel solution of acrylamide prepared on the PAAm hydrogel substrate undergoes open-air gelation, hexagonally packed dimples initially emerge on the surface, which later evolve into randomly oriented wrinkles. The formation of such self-organized patterns can be attributed to the surface instability resulting from autonomous water transport in the bilayer system during open-air fabrication. The temporal evolution of the patterns can be ascribed to an increase in overstress in the hydrogel film due to continued water uptake. The wrinkle wavelength can be controlled in the centimeter-scale range by adjusting the film thickness of the aqueous pregel solution. Our self-wrinkling method provides a simple mechanism for the generation of swelling-induced centimeter-scale wrinkles without requiring an external solvent, which is unachievable with conventional approaches.

  7. Mechanical nonreciprocity in a uniform composite material International-coauthorship Peer-reviewed

    X. Wang, Z. Li, S. Wang, K. Sano, Z. Sun, Z. Shao, A. Takeishi, S. Matsubara, D. Okumura, N. Sakai, T. Sasaki, T. Aida, Y. Ishida

    Science　380　192-198　2023

  8. Grobner bases plugged into graphical skills to solve a set of multiple bifurcation equations in structural compound stability problems Peer-reviewed

    Tanaka, M, Matsubara, S, Schröder, J, Fujii, F

    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING　123　(23)　5779-5800　2022/12/15

    Publisher: International Journal for Numerical Methods in Engineering

    DOI： 10.1002/nme.7088 　

    ISSN： 0029-5981

    eISSN： 1097-0207

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    A core issue in structural multiple bifurcations (MB) in computational engineering is to identify all existing branching paths emanating from the MB point in compound stability problems. The governing MB equations (MBEs) will commonly result in a set of three (or occasionally two) polynomial equations in asymptotic stability theory when the singular stiffness matrix is subject to a rank deficiency of two (i.e., two null eigenvalues). However, no general solution strategy has been established to solve MBEs so far. This study proposes innovative graphical solution ideas to intuitively visualize multiple path branching in 2D- and 3D-spaces of variables. Although the graphical skills display real solutions in specified search areas on a graphical monitor, it is not assured that “all” real roots are detected. The total number of identified real and complex roots of simultaneous equations must be generally consistent with that predicted algebraically to ensure that all real and complex roots are captured in MB. In computational algebra, Gröbner bases are employed to convert a set of polynomial equations into single recursively solvable equations and can be plugged into visualization steps. Therefore, Gröbner bases and graphical skills are complementary and can be applied to numerically solve a set of plate/shell structural MBEs.

  9. Variational crack phase-field model for ductile fracture with elastic and plastic damage variables Peer-reviewed

    Han, JK, Matsubara, S, Moriguchi, S, Terada, K

    COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING　400　2022/10/01

    Publisher: Computer Methods in Applied Mechanics and Engineering

    DOI： 10.1016/j.cma.2022.115577 　

    ISSN： 0045-7825

    eISSN： 1879-2138

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    Based on the study on characteristic features of existing crack phase-field (PF) models for ductile fracture, we propose a new model endowed with elastic and plastic damage variables. In the review part, the emphasis is placed on the plastic driving force and degrading fracture toughness that enable PF models to represent damage evolution in elastoplastic materials. Attention is also paid to the damage evolution tendency in terms of the definition of the yield function. Based on the reviewed features, we originally formulate the proposed model, which separately accommodates two damage variables for elasticity and plasticity. Its constitutive work density consists of elastic, plastic hardening, and damage hardening components. Evolution laws for plasticity and damage are derived by using separate threshold (yield) functions while having similar formats so that those for damage hold variational and thermodynamic consistencies. Also, the proposed model is equipped with thresholds and coefficients to control the amount of damage driving force. Several numerical examples are presented to demonstrate the characteristic features of the proposed model and the ability to mimic the typical fracture behavior of elastoplastic materials.

  10. Diversity of the bifurcations and deformations on films bonded to soft substrates: Robustness of the herringbone pattern and its cognate patterns Peer-reviewed

    Kikuchi, S, Matsubara, S, Nagashima, S, Okumura, D

    JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS　159　2022/02

    Publisher: Journal of the Mechanics and Physics of Solids

    DOI： 10.1016/j.jmps.2021.104757 　

    ISSN： 0022-5096

    eISSN： 1873-4782

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    In this study, we investigate the diversity of the bifurcations and deformations during evolution of periodic patterns on compressed films bonded to compliant substrates. Three-dimensional finite element analysis is performed assuming that the first bifurcation has either the hexagonal or square (i.e., checkerboard) dimple mode. Step-by-step eigenvalue buckling analysis is performed to explore sequential bifurcations on the bifurcated paths. It is found that at the second bifurcation, a rectangular checkerboard or stripe mode occurs depending not only on the Young's modulus ratio of the film and substrate, but also on the magnitude of the imperfection prescribed by the first bifurcation mode. Different bifurcation modes give a family of herringbone deformation patterns with different dimensions, i.e., the evolutional process is multiple and robust. Further, superposition of the identical modes in symmetric directions elucidates the existence of distinctive patterns cognate with the herringbone pattern, including a variety of experimentally observed patterns.

  11. Crease instability in Gent-Gent hyperelastic materials Peer-reviewed

    Seishiro Matsubara, Keijiro Kobayashi, Tatsuya Ishida, So Nagashima, Dai Okumura

    International Journal of Mechanical Sciences　280　2024/10/15

    DOI： 10.1016/j.ijmecsci.2024.109549 　

    ISSN： 0020-7403

  12. Deformation in the wrinkle–crease transformation Peer-reviewed

    Tatsuya Ishida, Seishiro Matsubara, So Nagashima, Dai Okumura

    International Journal of Solids and Structures　298　2024/07/15

    DOI： 10.1016/j.ijsolstr.2024.112876 　

    ISSN： 0020-7683

  13. ノンレシプロカルゲルの円筒押し込み大変形解析 Peer-reviewed

    野々垣翔真, 松原成志朗, 永島壮, 奥村大

    計算数理工学論文集　23　(17-231124)　2023/11

  14. クリースの発達過程に対する影響因子の調査 Peer-reviewed

    石田竜也, 永島壮, 松原成志朗, 奥村大

    計算数理工学論文集　23　(20-231124)　2023/11

  15. 均質化解析によるノンレシプロカルゲルの引張・圧縮非対称性評価 Peer-reviewed

    布施卓馬, 松原成志朗, 永島壮, 奥村大

    計算数理工学論文集　23　(19-231124)　2023/11

  16. 粘弾性・粘塑性・損傷複合モデルに対する材料物性値の混合型同定による熱可塑性樹脂の非線形材料挙動の再現と評価 Peer-reviewed

    染宮 聖人, 田口 尚輝, 平山 紀夫, 松原 成志朗, 山本 晃司, 寺田 賢二郎

    日本機械学会論文集　88　(913)　22-00178　2022/08

  17. 数値材料試験とニューラルネットワークを用いた一方向CFRPの界面接着強度の予測 Peer-reviewed

    鷹見 凌, 染宮 聖人, 平山 紀夫, 山本 晃司, 松原 成志朗, 石橋 慶輝, 寺田 賢二郎

    日本複合材料学会誌　48　(1)　32-39　2022/06

  18. リッジパターン変態のプレストレッチ依存性と分 岐座屈特性 Peer-reviewed

    田中大地, 若林駿人, 松原成志朗, 永島壮, 奥村大

    計算数理工学論文集　22　(13-221216)　2022

  19. 数値材料試験による一方向炭素繊維強化 熱可塑性樹脂の非主軸方向における非線形材料挙動の予測 Peer-reviewed

    染宮聖人, 平山紀夫, 山本晃司, 松原成志朗, 寺田賢二郎

    日本複合材料学会誌　48　(3)　96-108　2022

  20. Crack phase-field model equipped with plastic driving force and degrading fracture toughness for ductile fracture simulation Peer-reviewed

    Jike Han, Seishiro Matsubara, Shuji Moriguchi, Michael Kaliske, Kenjiro Terada

    Computational Mechanics　2021/09/23

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s00466-021-02087-1 　

    ISSN： 0178-7675

    eISSN： 1432-0924

  21. Ductile fracture crack phase-field model equipped with a novel degrading fracture toughness Peer-reviewed

    HAN Jike, MURATA Masanobu, MORIGUCHI Shuji, TERADA Kenjiro, MATSUBARA Seishiro, NISHI Shinnosuke, TAKADA Kenji, MURAMATSU Mayu, OMIYA Masaki, OGAWA Kensuke, OIDE Kai, KOBAYASHI Takaya

    Transactions of the Japan Society for Computational Engineering and Science　2021　20210014-20210014　2021/08

    Publisher: JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE

    DOI： 10.11421/jsces.2021.20210014 　

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    <p>This study aims to enhance the crack phase-field model for ductile fracture by introducing a novel degrading fracture toughness to reflect damage evolution based on the phenomenological justification for the failure mechanism in elastoplastic materials. The free energy consists of elastic, pseudo-plastic and crack components. The governing equations are derived as stationary conditions for the corresponding local and global optimization problems within the continuum thermodynamics framework. Then, we introduce a degrading fracture toughness to reflect the evolution of micro-defects and their coalescences that are caused by both plastic deformation and negative hydrostatic pressure. Equipped with this implement, the proposed crack phase-field model realizes the reduction of both stiffness and fracture toughness to simulate the failure phenomena of elastoplastic materials. Two numerical examples are presented to demonstrate the capability of the proposed model in reproducing typical ductile fracture behaviors.</p>

  22. Implicit rule on the elastic function of a swollen polyacrylamide hydrogel Peer-reviewed

    Ryota Kawai, Hiro Tanaka, Seishiro Matsubara, Shohei Ida, Makoto Uchida, Dai Okumura

    Soft Matter　17　(19)　4979-4988　2021/05/21

    DOI： 10.1039/d1sm00346a 　

    ISSN： 1744-683X

    eISSN： 1744-6848

  23. Effects of initial imperfection and mesh resolution on wrinkle and crease analyses Peer-reviewed

    HOSHI Ryogo, MIYOSHI Hiroaki, MATSUBARA Seishiro, OKUMURA Dai

    Transactions of the JSME (in Japanese)　87　(898)　21-00045-21-00045　2021/05

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/transjsme.21-00045 　

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    <p>This study investigates the effects of initial imperfection and mesh resolution on the wrinkling and creasing. Finite element analyses are conducted to simulate compression behaviors of an incompressible Neo-Hookean elastic plane with a V-shaped notch as initial imperfection, so that the occurrences and evolutions of wrinkle and crease are evaluated quantitatively. As a result, it is demonstrated that the origins of wrinkle and crease can be determined by the overall and local strains even for the introduction of a V-shaped notch. Further, we illustrate that the converged specific local strain with respect to the increase of mesh resolution almost coincides with the condition of the occurrence of wrinkle (i.e., εw = 0.456) when the depth of a V-shaped notch is sufficiently small. We also show that the sizes of wrinkle and crease do not converge due to strain localization around a V-shaped notch. In the investigation of pattern evolutions about initial imperfection, we illustrate that two kinds of pattern evolution can be comprehensively discussed by varying the depth of a V-shaped notch, so that the condition of the occurrence of crease can be organized by the sharpness of a V-shaped notch.</p>

  24. Thermo-mechanical coupled incremental variational formulation for thermosetting resins subjected to curing process Peer-reviewed

    Yosuke Yamanaka, Seishiro Matsubara, Risa Saito, Shuji Moriguchi, Kenjiro Terada

    International Journal of Solids and Structures　216　30-42　2021/05/01

    DOI： 10.1016/j.ijsolstr.2021.01.014 　

    ISSN： 0020-7683

  25. Bifurcation and deformation during the evolution of periodic patterns on a gel film bonded to a soft substrate Peer-reviewed

    Hiroaki Miyoshi, Seishiro Matsubara, Dai Okumura

    Journal of the Mechanics and Physics of Solids　148　2021/03

    DOI： 10.1016/j.jmps.2020.104272 　

    ISSN： 0022-5096

  26. A variationally consistent formulation of the thermo-mechanically coupled problem with non-associative viscoplasticity for glassy amorphous polymers Peer-reviewed

    Seishiro Matsubara, Kenjiro Terada

    International Journal of Solids and Structures　212　152-168　2021/03/01

    DOI： 10.1016/j.ijsolstr.2020.12.004 　

    ISSN： 0020-7683

  27. A decoupling scheme for two-scale finite thermoviscoelasticity with thermal and cure-induced deformations Peer-reviewed

    Risa Saito, Yosuke Yamanaka, Seishiro Matsubara, Tomonaga Okabe, Shuji Moriguchi, Kenjiro Terada

    International Journal for Numerical Methods in Engineering　122　(4)　1133-1166　2021/02/28

    DOI： 10.1002/nme.6575 　

    ISSN： 0029-5981

    eISSN： 1097-0207

  28. Formulation for the Cam-clay model based on the finite deformation theory with the multiplicative decomposition of the deformation gradient and avoidance of the volumetric locking by using the F-bar method Peer-reviewed

    KUBOTA Tomoya, YAMADA Shotaro, MATSUBARA Seishiro, KYOYA Takashi

    Transactions of the Japan Society for Computational Engineering and Science　2021　20210001-20210001　2021

    Publisher: JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE

    DOI： 10.11421/jsces.2021.20210001 　

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    <p>This paper presents a formulation for the Cam-clay model based on the finite deformation theory with the multiplicative decomposition of the deformation gradient. We developed an implicit stress-update scheme using the return-mapping algorithm and derived the consistent tangent modulus analytically. We also demonstrated that the scheme had high accuracy and quadratic convergence. By conducting the finite element analysis, we obtained the following conclusions. 1) Even though the Cam-clay model has compressibility both elastically and plastically, volumetric locking occurs. That is because the model shows the nearly incompressible property in the vicinity of the critical state. 2) F-bar method is useful for avoidance of the volumetric locking.</p>

  29. AN INCREMENTAL MEAN DILATATION METHOD FOR THE FULLY COUPLED THERMO-MECHANICAL PROBLEM OF NEARLY INCOMPRESSIBLE MATERIALS Peer-reviewed

    20　(05-201219)　101-109　2020/12

  30. FE r method with surrogate localization model for hyperelastic composite materials Peer-reviewed

    Ryo Hatano, Seishiro Matsubara, Shuji Moriguchi, Kenjiro Terada, Julien Yvonnet

    Advanced Modeling and Simulation in Engineering Sciences　7　(1)　2020/12/01

    DOI： 10.1186/s40323-020-00175-0 　

    eISSN： 2213-7467

  31. Decoupled two-scale viscoelastic analysis of FRP in consideration of dependence of resin properties on degree of cure Peer-reviewed

    Risa Saito, Yuya Yamaguchi, Seishiro Matsubara, Shuji Moriguchi, Yasuko Mihara, Takaya Kobayashi, Kenjiro Terada

    International Journal of Solids and Structures　190　199-215　2020/05/01

    DOI： 10.1016/j.ijsolstr.2019.11.010 　

    ISSN： 0020-7683

  32. Finite element implementation of Gent-Gent hyperelastic model for swollen elastomers Peer-reviewed

    KIKUCHI Shotaro, MIYOSHI Hiroaki, MATSUBARA Seishiro, OKUMURA Dai

    Transactions of the JSME (in Japanese)　86　(890)　20-00233-20-00233　2020

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/transjsme.20-00233 　

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    <p>In this study, we conduct finite element implementation of a Gent-Gent hyperelastic model for swollen elastomers. To this end, an inhomogeneous field theory for swollen elastomers is extended using the Gent-Gent model, which includes the effects of limiting chain extensibility and the second strain-invariant. The extended theory is implemented into a commercial finite element package using a user-defined material subroutine. The accuracy of the implementation is verified by analyzing Young's modulus and Poisson's ratio of swollen elastomers undergoing large deformations. Further, the inflation of a spherical balloon made of swollen elastomers is computed as an example. The results are verified with an analytical prediction and demonstrate the inflation behavior of swollen elastomers.</p>

  33. Incremental variational formulation of time evolution of cure-degree along with viscoelasticity for thermosetting resins Peer-reviewed

    YAMANAKA Yosuke, MATSUBARA Seishiro, SAITO Risa, MORIGUCHI Shuji, TERADA Kenjiro

    Transactions of the Japan Society for Computational Engineering and Science　2020　20200011-20200011　2020

    Publisher: JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE

    DOI： 10.11421/jsces.2020.20200011 　

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    <p>In the thermodynamically consistent formulation of the material behavior of thermosetting resins subjected to curing, a dual dissipation potential (DDP) for the cure state is originally derived in conjunction with that for viscoelasticity, and the free energy combined with these DDPs is applied to the incremental variational framework (IVF) to construct an algorithm to efficiently solve the equilibrium problem. By the introduction of the 'cure' multiplier as an internal variable to the cure's DDP, a flow rule for the degree of cure (DOC), which is equivalent to the stationary condition of the Legendre-Fenchel transformation, is defined as a constraint condition for the rate of change of the total energy in the IVF. The flow condition of the DOC for the prescribed flow rule that is analogous with that of viscoplasticity is transformed along the lines of Perzyna's viscoplastic over-stress theory and is therefore fully consistent with the vairational structure of mathematical theory for plasticity. As a result, the governing equation for the global equilibrium and the constitutive equations for local material behavior, which correspond to the stationary conditions of the rate of change of the total energy within the IVF, are also variationally consistent so that all the state variables can be implicitly solved in the numerical scheme. The verification analysis is carried out to confirm that the proposed method provides the same numerical result with that obtained by the conventional framework.</p>

  34. Viscoelastic-viscoplastic combined constitutive model for glassy amorphous polymers under loading/unloading/no-load states Peer-reviewed

    Seishiro Matsubara, Kenjiro Terada, Ryusei Maeda, Takaya Kobayashi, Masanobu Murata, Takuya Sumiyama, Kenji Furuichi, Chisato Nonomura

    Engineering Computations (Swansea, Wales)　2020

    DOI： 10.1108/EC-05-2019-0197 　

    ISSN： 0264-4401

  35. A data-driven micro-macro coupled multiscale analysis for hyperelastic composite materials Peer-reviewed

    HATANO Ryo, MATSUBARA Seishiro, MORIGUCHI Shuji, TERADA Kenjiro

    Transactions of the Japan Society for Computational Engineering and Science　2019　(0)　20190015-20190015　2019

    Publisher: 一般社団法人 日本計算工学会

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    &lt;p&gt;A data-driven approach is developed for micro-macro coupled multiscale analysis of hyperelastic composite materials. The offline process in this approach is to make a database that stores the microscopic stress distributions in response to various patterns of macroscopic deformation gradients. This can be done by carrying out an adequate number of numerical material tests on a periodic microstructures, or equivalently, a unit cell and followed by the proper orthogonal decomposition (POD) to extract the principal components of the data along with the corresponding basis vectors. In order to realize FE&lt;sup&gt;2&lt;/sup&gt;-type two-scale analysis in the online process, we interpolate each of the coefficients with the radial basis functions as a function of a macroscopic deformation gradient and make the resulting continuous function gently varying by means of the L2-regularization followed by the cross-validation and Bayesian optimization techniques. Each of the functions thus obtained is referred to as &quot;data-driven function&quot; of the microscopic stress distribution and can be used to obtain the macroscopic stress by the averaging process in the homogenization method. A representative numerical example is presented to validate the proposed data-driven FE&lt;sup&gt;2&lt;/sup&gt; analyses in comparison with high-fidelity direct FE&lt;sup&gt;2&lt;/sup&gt;.&lt;/p&gt;

  36. On the treatments of heterogeneities and periodic boundary conditions for isogeometric homogenization analysis Peer-reviewed

    Seishiro Matsubara, Shin-Nosuke Nishi, Kenjiro Terada

    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING　109　(11)　1523-1548　2017/03

    DOI： 10.1002/nme.5328 　

    ISSN： 0029-5981

    eISSN： 1097-0207

  37. NUMERICAL PLATE TESTING FOR NON-LINEAR MULTI-SCALE ANALYSIS OF PLATE-SHAPED DEVICE Peer-reviewed

    SATO Masami, MURAMATSU Mayu, MATSUBARA Seishiro, NISHI Shinnosuke, TERADA Kenjiro, YASHIRO Keiji, KAWADA Tatsuya

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　73　(2)　I_283-I_294　2017

    Publisher: 公益社団法人 土木学会

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    We propose a new method of multi-scale analysis for plate-like devices such as a flat plate cell of solid oxide fuel cell (SOFC), which is classified into a composite plate composed of in-plane periodic structures. To characterize the macroscopic nonlinear mechanical behavior of the in-plane periodic structure, the method of numerical plate testing is employed. Since the obtained relationships between macroscopic generalized strains and stress cannot be represented by an equivalent homogeneous plate with a single material, we introduce a surrogate model composed of homogeneous layers that is expected to exhibit the same macroscopic responses. After the material parameters of these layers are identified, the macroscopic analysis becomes possible by use of a laminated structure with continuum solid shell elements available in a general-purpose finite element program. Representative numerical examples are presented to demonstrate the capability of the proposed multi-scale analysis method.

  38. A set of constitutive functions for dried body to predict entire deformation process of ceramic products during firing Peer-reviewed

    Seishiro Matsubara, Kenjiro Tarada, Takaya Kobayashi, Toshiyuki Saitou, Manabu Umeda, Yasuko Mihara, Kai Oide, Hiroto Shin, Yasuhiro Katsuda

    ENGINEERING COMPUTATIONS　34　(8)　2668-2697　2017

    DOI： 10.1108/EC-12-2016-0444 　

    ISSN： 0264-4401

    eISSN： 1758-7077

  39. Isogeometric analysis method for heterogeneous periodic microstructures Peer-reviewed

    Seishiro Matsubara, Kenjiro Terada, Fumio Fujii

    Transactions of the Japan Society for Computational Engineering and Science　2016　(0)　20160010-20160010　2016/03/23

    Publisher: Japan Society for Computational Engineering and Science

    DOI： 10.11421/jsces.2016.20160010 　

    ISSN： 1347-8826

  40. Rheological constitutive model for thermoplastic resin based on viscoplastic-viscoelastic multiplicative decomposition of deformation gradient Peer-reviewed

    MATSUBARA Seishiro, TERADA Kenjiro

    Transactions of the JSME (in Japanese)　82　(839)　16-00060-16-00060　2016

    Publisher: 一般社団法人 日本機械学会

    DOI： 10.1299/transjsme.16-00060 　

    ISSN： 2187-9761

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    &lt;p&gt;We propose a rheology-based viscoelastic-viscoplastic constitutive model in which the deformation gradient is mutiplicatively decomposed into viscoelastic and viscoplastic components. The viscoelastic and viscoplastic rheology elements are connected in series, and the stress is determined only in the former element, which is modified by the back stress introduced in the latter one to represent the hardening due to orientation of molecular chains. The standard generalized Maxwell model is used to characterize the viscoelastic material behavior at small or moderate strain regime, while a proven finite strain viscoplastic model is employed to realize the transient creep deformations due to frictional resistance of molecular chains. After identifying the material parameters with reference to experimental data and verifying the fundamental performance of the proposed model in reproducing typical material behavior of resin, we carry out two kinds of numerical analyses for simple structures to demonstrate its applicability for practical use.&lt;/p&gt;

  41. Constitutive equations of earthenware material during firing processes and determination of their function forms Peer-reviewed

    MATSUBARA Seishiro, SAITOU Toshiyuki, OIDE Kai, SHIN Hiroto, UMEDA Manabu, KATSUDA Yasuhiro, MIHARA Yasuko, KOBAYASHI Takaya, TERADA Kenjiro

    Transactions of the JSME (in Japanese)　82　(843)　16-00266-16-00266　2016

    Publisher: 一般社団法人 日本機械学会

    DOI： 10.1299/transjsme.16-00266 　

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    &lt;p&gt;We propose a set of constitutive equations of earthenware material subjected to the firing process and appropriate ways of determining their function forms and relevant material parameters from a series of respective experiments. The firing process under a specific heat curves is generally divided into three different phases; &quot;thermal dilatation phase&quot;, &quot;sintering phase&quot; and &quot;thermal contraction phase&quot;. These non-mechanical deformations are assumed not to be coincident, and the mechanical ones are assumed to be represented by viscoplastic constitutive model. Then, the key issue must be how to determine sintering strains by calibrating the employed function form of the densification rate with the data obtained from the stairway thermal cycle (STC) tests. Also, the presentations of the dependencies of the elastic and creep properties on both temperature and density are of particular importance to accurately predict the overall deformation of earthware. All the relevant material parameters as well as coefficients of thermal expansion and contraction are identified with the data obtained from respective mechanical experiments conducted in testing equipments for thermo-mechanical analysis (TMA) under several levels of termperature. The method of differential evolution, which is one of the metaheuristic optimization techniques, is employed to identify the creep parameters, since the mechanical responses to several levels of loading during firing processes involve all the non-mechanical and mechanical deformation of specimens simultaneously. The calculation results with the proposed constitutive equations are compared with the original experimental data to demonstrate the applicability for practical use of their function forms determined by the proposed strategy.&lt;/p&gt;

  42. Numerical plate testing for linear two-scale analyses of composite plates with in-plane periodicity Peer-reviewed

    Kenjiro Terada, Norio Hirayama, Koji Yamamoto, Mayu Muramatsu, Seishiro Matsubara, Shin-nosuke Nishi

    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING　105　(2)　111-137　2016/01

    DOI： 10.1002/nme.4970 　

    ISSN： 0029-5981

    eISSN： 1097-0207

  43. Numerical plate testing for linear multi-scale analyses of composite plates Peer-reviewed

    TERADA Kenjiro, HIRAYAMA Norio, YAMAMOTO Koji, MATSUBARA Seishiro

    Transactions of the Japan Society for Computational Engineering and Science　2015　(0)　20150001-20150001　2015

    Publisher: JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE

    DOI： 10.11421/jsces.2015.20150001 　

    ISSN： 1347-8826

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    A method of numerical plate testing for composite plates with in-plane periodic heterogeneity is proposed. A thick plate model with transverse shear deformation is employed at macro-scale, while three-dimensional solids are assumed at micro-scale. The homogenization process to evaluate the macroscopic plate stiffnesses is called &quot;numerical plate testing&quot; (NPT) in this study, which is in fact a series of microscopic analysis on a unit cell. The specific functional forms of microscopic displacements are originally presented so that the relationship between the macroscopic resultant stresses/moments and strains/curvatures to be consistent with the microscopic equilibrated state. In order to perform NPT by using general-purpose FEM software, we introduce control nodes to facilitate the multiple-point constraints for in-plane periodicity. Numerical examples are presented to verify that the proposed method of NPT reproduces the plate stiffnesses in classical plate and laminate theories. We also perform a series of NMT (homogenization analysis), macroscopic and localization analyses for an in-plane heterogeneous composite plate to demonstrate the performance of the proposed method.

  44. FINITE STRAIN VISCOELASTO-VISCOPLASTIC CONSTITUTIVE MODEL FOR THERMOPLASTIC RESINS IN CONSIDERATION OF SELF-HEATING PHENOMENON Peer-reviewed

    MATSUBARA Seishiro, TERADA Kenjiro

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　71　(2)　I_509-I_520　2015

    Publisher: 公益社団法人 土木学会

    DOI： 10.2208/jscejam.71.I_509 　

    ISSN： 2185-4661

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    We propose a rheology-based viscoelastic-viscoplastic constitutive model that takes into account the self-heating phenomenon of thermoplastic resin. Different kinds of hyperelastic constitutive laws are used for the viscoelastic and viscopelastic rheological elements. A generalized Maxwell model is used to characterize the viscoelastic material behavior at small or moderate strain regime, while a finite strain viscoplastic model is employed to transient creep deformations due to frictional resistance of molecular chains. Also, back stress is introduced to represent the hardening due to orientation of molecular chains. After verifying the fundamental performance of the proposed model in reproducing typical material behavior of resin, we carry out several numerical analyses for simple structures to demonstrate its applicability for practical use.

  45. Applicability of micro-macro decoupling scheme to two-scale analysis of fiber-reinforced plastics Peer-reviewed

    Kenjiro Terada, Norio Hirayama, Koji Yamamoto, Junji Kato, Takashi Kyoya, Seishiro Matsubara, Yusuke Arakawa, Yuta Ueno, Naohiro Miyanaga

    ADVANCED COMPOSITE MATERIALS　23　(5-6)　421-450　2014/09

    DOI： 10.1080/09243046.2014.915098 　

    ISSN： 0924-3046

    eISSN： 1568-5519

  46. De-coupled multi-scale analyses of fiber-reinforced composites by elastic-creep-damage combined model Peer-reviewed

    MATSUBARA Seishiro, ARAKAWA Yusuke, KATO Junji, TERADA Kenjiro, KYOYA Takashi, UENO Yuta, MIYANAGA Naohiro, HIRAYAMA Norio, YAMAMOTO Kouji

    Transactions of the Japan Society for Computational Engineering and Science　2014　(0)　20140004-20140004　2014

    Publisher: JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE

    DOI： 10.11421/jsces.2014.20140004 　

    ISSN： 1347-8826

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    The numerical study is made to illustrate the applicability of the &lt;i&gt;method of decoupled multi-scale analysis&lt;/i&gt; to the micro-macro evaluation of the mechanical behavior of carbon-fiber-reinforced plastics (CFRP) that exhibit inelastic deformations and internal damage of the matrix material. During the course of this illustration, it is confirmed that the reliability of the decoupled method can be guaranteed if the macroscopic constitutive model is introduced so as to inherit the microscopic material behavior. To this end, with reference to the results of the numerical material testing on the periodic microstructures (unit cells) of CFRP, we propose an anisotropic elasto-plastic-creep-damage combined constitutive model to represent the macroscopic material behavior and demonstrate the characteristics of the inelastic deformations that resemble the material behavior assumed for plastics at micro-scale. With the identified macroscopic material parameters, the macroscopic structural analysis, which is followed by the localization analysis consistently, can be an actual proof of the utility value of the decoupled method in practice.

Show all ︎Show first 5

Misc. 167

  1. STUDY ON THE MECHANICAL ASYMMETRY OF A NON-RECIPROCAL GEL USING COMPUTATIONAL HOMOGENIZATION

    Takuma Fuse, Seishiro Matsubara, So Nagashima, Dai Okumura

    WCCM2024　2024/07

  2. STABILIZATION OF LARGE DEFORMATION ANALYSIS FOR A NONRECIPROCAL GEL UNDER CYLINDRICAL INDENTATION

    Shoma Nonogaki, Seishiro Matsubara, So Nagashima, Dai Okumura

    WCCM2024　2024/07

  3. NUMERICAL ANALYSIS OF WRINKLE TRANSFORMATION DUE TO WATER SURFACE TENSION

    Rikuto Ohta, So Nagashima, Seishiro Matsubara, Dai Okumura

    WCCM2024　2024/07

  4. for bridging scales in the mechanics and physics of complex materials Effect of the inelastic self-heating on thermo-mechanically coupled two-scale behaviors

    Seishiro Matsubara, So Nagashima, Dai Okumura, Kenjiro Terada

    WCCM2024　2024/07

  5. ノンレシプロカルゲルの大変形解析に対するアワーグラス安定化

    野々垣 翔真, 松原 成志朗, 永島 壮, 奥村 大

    日本計算工学会第29回計算工学講演会　2024/06

  6. 微視的座屈・座屈後解析によるノンレシプロカルゲルのユニットセル解析

    布施 卓馬, 松原 成志朗, 永島 壮, 奥村 大

    日本計算工学会第29回計算工学講演会　2024/06

  7. 混合型アイソジオメトリック解析手法による二層弾性体の表面不安定解析

    松原 成志朗, 平川 明莉, 野々垣 翔真, 永島 壮, 奥村 大

    日本計算工学会第29回計算工学講演会　2024/06

  8. Stabilization of a Nonreciprocal Gel in Large Deformation Analysis and its Efect on Accuracy and Efciency

    Shoma Nonogaki, Seishiro Matsubara, So Nagashima, Dai Okumura

    IUTAM Symposium on Mechanics of Soft Materials and Soft Robots　2024/05

  9. Tension-Compression Asymmetry Evaluation of Nonreciprocal Gels Using Homogenization Analysis

    Takuma Fuse, Seishiro Matsubara, So Nagashima, Dai Okumura

    IUTAM Symposium on Mechanics of Soft Materials and Soft Robots　2024/05

  10. Folding of a Thin Film on a Fiber-Incorporated Soft Substrate

    Shunsuke Hayashi, So Nagashima, Akbar Solhtalab, Seishiro Matsubara, Mir Jalil Razavi, Dai Okumura

    IUTAM Symposium on Mechanics of Soft Materials and Soft Robots　2024/05

  11. Effect of Material Properties on Crease Formation in Gent–Gent Elastomer

    Seishiro Matsubara, Keijiro Kobayashi, Tatsuya Ishida, So Nagashima, Dai Okumura

    IUTAM Symposium on Mechanics of Soft Materials and Soft Robots　2024/05

  12. 金属薄膜のリンクル形成に及ぼす成膜角度の影響

    永島 壮, 大久保 建, 松原 成志朗, 奥村 大

    日本材料学会第9回マルチスケール材料力学シンポジウム　2024/05

  13. 水フィラメントによるリンクル・フォールド変態の数値解析

    太田 陸斗, 永島 壮, 松原 成志朗, 奥村 大

    日本材料学会第9回マルチスケール材料力学シンポジウム　2024/05

  14. 表面パターン解析におけるB-spline関数の性能評価

    松原 成志朗, 平川 明莉, 永島 壮, 奥村 大

    東海支部第73期総会・講演会 TOKAI ENGINEERING COMPLEX 2024（TEC24)　2024/03

  15. 薄膜リンクルの寸法および配向に及ぼす成膜角度の影響

    大久保 建, 永島 壮, 松原 成志朗, 奥村 大

    日本材料学会東海支部 第18回学術講演会　2024/03

  16. An incremental variational formulation for mixed thermomechanically coupled problems of nearly incompressible solids

    Seishiro Matsubara

    6th German-Japanese Workshop on Computational Mechanics　2023/12

  17. Study on the effects of mesh resolution and surface tension on the occurrence of crease in an elastomer

    Seishiro Matsubara, Atsuya Ogino, So Nagashima, Dai Okumura

    ICOME2023　2023/11

  18. Computational homogenization of mechanical nonreciprocity in a uniform composite

    Takuma Fuse, Dai Okumura, So Nagashima, Seishiro Matsubara

    ICOME2023　2023/11

  19. チューブの外壁形状によるクリース発生角度の制御

    神圭佑, 松原成志朗, 永島壮, 奥村大

    第 36 回計算力学講演会（CMD2023）　2023/10

  20. 水の表面張力によるリンクルｰフォールド変態の数値解析

    太田陸斗, 永島壮, 奥村大, 松原成志朗

    第 36 回計算力学講演会（CMD2023）　2023/10

  21. 非・微圧縮性を有する散逸固体の熱・機械連成混合型 Isogeometric 解析

    松原成志朗,永島壮,奥村大

    第 36 回計算力学講演会（CMD2023）　2023/10

  22. ノンレシプロカルゲルの微視的座屈・座屈後解析

    布施卓馬, 奥村大, 永島壮, 松原成志朗

    第 36 回計算力学講演会（CMD2023）　2023/10

  23. リンクル―クリース変態における分岐経路の非線形有限要素解析

    石田竜也, 松原成志朗, 永島壮, 奥村大

    第 36 回計算力学講演会（CMD2023）　2023/10

  24. Effects of surface tension on crease nucleation and evolution in an elastomer subjected to uniaxial, plane strain, and equibiaxial compressions

    Dai Okumura, Atsuya Ogino, Seishiro Matsubara, So Nagashima

    IUTAM Symposium Creep in Structures　2023/09

  25. Time-swelling superposition principle for the linear viscoelastic properties of polyacrylamide hydrogels

    Seishiro Matsubara, Akira Takashima, So Nagashima, Shohei Ida, Hiro Tanaka, Makoto Uchida, Dai Okumura

    IUTAM Symposium Creep in Structures　2023/09

  26. Two-scale Analysis of Elastoplastic Material by Means of RBF-Based Surrogate Model

    Y. Yamanaka, S. Matsubara, N. Hirayama, S. Moriguchi, K. TERADA

    COMPLAS2023　2023/09

  27. Transient Thermo-Mechanically Coupled Analysis for Dissipative Composites Considering Periodicity of Perturbed Temperature

    S. Matsubara, S. Nagashima, D. Okumura, K. Terada

    COMPLAS2023　2023/09

  28. 異方濡れ特性を有する階層凹凸パターンのボトムアップ形成

    永島 壮, 鈴木 航, 松原 成志朗, 奥村 大

    M&M2023/M&P2023　2023/09

  29. 二層ハイドロゲルのパターン形成に及ぼす厚さ勾配の影響

    内山 航, 永島 壮, 松原 成志朗, 奥村 大

    M&M2023/M&P2023　2023/09

  30. リンクル―クリース変態のための連鎖反応モデル

    石田 竜也, 松原 成志朗, 永島 壮, 奥村 大

    M&M2023/M&P2023　2023/09

  31. リッジパターンの発現に至る第二分岐特性

    奥村 大, 太田 陸斗, 松原 成志朗, 永島 壮

    M&M2023/M&P2023　2023/09

  32. 膨潤エラストマーに対する高分子鎖の伸び切り効果を考慮した溶媒拡散・変形連成解析

    松原 成志朗,永島 壮,奥村 大

    M&M2023/M&P2023　2023/09

  33. 二層モデルを用いたノンレシプロカルゲルの均質化解析

    布施 卓馬, 奥村 大, 永島 壮, 松原 成志朗

    M&M2023/M&P2023　2023/09

  34. 重合促進剤によるゲル化誘起パターンの制御

    程 相輔, 永島 壮, 松原 成志朗, 奥村 大

    M&M2023/M&P2023　2023/09

  35. Mixed variational formulation for thermo-mechanically coupled problem of thermoset resin subjected to curing process

    2023/08

  36. 均質化弾塑性構成則の代理モデルによるマルチスケール解析

    山中 耀介, 松原 成志朗, 平山 紀夫, 森口 周二, 寺田 賢二郎

    第28回計算工学講演会　2023/06

  37. 混合型増分ポテンシャル法による微圧縮性材料の熱・機械連成アイソジオメトリック解析

    松原 成志朗, 村松 亮, 永島 壮, 奥村 大

    第28回計算工学講演会　2023/06

  38. ゲル化誘起パターンの形成に及ぼす重合促進剤の影響

    程 相輔, 永島 壮, 松原 成志朗, 奥村 大

    日本材料学会第72期学術講演会　2023/05

  39. 金属ナノ薄膜の変形による階層凹凸パターンの形成

    永島 壮, 鈴木 航, 松原 成志朗, 奥村 大

    日本材料学会第8回マルチスケール材料力学シンポジウム　2023/05

  40. クリースのスケール・メッシュ依存性に及ぼす負荷条件の影響

    荻野 敦也, 松原 成志朗, 永島 壮, 奥村 大

    日本機械学会第35回計算力学講演会(CMD2022)　2022/11

  41. 非弾性複合材料に対する微視的伝熱現象の非定常性を考慮したマルチスケール解析

    松原 成志朗, 永島 壮, 奥村 大

    日本機械学会第35回計算力学講演会(CMD2022)　2022/11

  42. ソフトマテリアルの表面不安定に及ぼす底面の影響

    中島 大貴, 松原 成志朗, 永島 壮, 奥村 大

    日本機械学会第35回計算力学講演会(CMD2022)　2022/11

  43. 微圧縮性固体に対する熱・機械連成解析手法の開発

    村松 亮, 松原 成志朗, 奥村 大, 永島 壮

    日本機械学会第35回計算力学講演会(CMD2022)　2022/11

  44. 金属薄膜リッジパターンを用いた異方濡れの制御

    鈴木 航, 永島 壮, 松原 成志朗, 奥村 大

    日本機械学会最適化シンポジウム2022(OPTIS2022)　2022/11

  45. リンクルからクリースへの変態制御のための非線形有限要素解析

    石田 竜也, 荻野 敦也, 松原 成志朗, 永島 壮, 奥村 大

    日本機械学会最適化シンポジウム2022(OPTIS2022)　2022/11

  46. 増分ポテンシャル法による微圧縮性材料の熱・機械連成解析

    村松 亮, 松原 成志朗, 永島 壮, 奥村 大

    日本機械学会最適化シンポジウム2022(OPTIS2022)　2022/11

  47. チューブ内壁に生じるクリースの伝播及び間隔の制御

    神 圭佑, 松原 成志朗, 永島 壮, 奥村 大

    日本機械学会最適化シンポジウム2022(OPTIS2022)　2022/11

  48. 切り欠きから伝播するクリースの周期間隔

    奥村 大, 星 亮吾, 中島大貴, 松原 成志朗, 永島 壮

    日本機械学会M&M2022材料力学カンファレンス　2022/09

  49. ハイドロゲルの線形粘弾性特性評価のための時間・膨潤重ね合わせの原理

    松原 成志朗, 高島 晃, 永島 壮, 伊田 翔平, 田中 展, 内田 真, 奥村 大

    日本機械学会M&M2022材料力学カンファレンス　2022/09

  50. クリースの発生・発達に対するスケールとメッシュの依存性

    荻野 敦也, 松原 成志朗, 永島 壮, 奥村 大

    日本機械学会M&M2022材料力学カンファレンス　2022/09

  51. 圧縮変形下の金属ナノ薄膜に生じるリッジパターンの異方濡れ特性

    鈴木 航, 永島 壮, 松原 成志朗, 奥村 大

    日本機械学会M&M2022材料力学カンファレンス　2022/09

  52. Incremental Mean-Dilatation Method for Coupled Thermo-Mechanical Problems in Nearly Incompressible Solids

    Ryo Muramatsu, Seishiro Matsubara, So Nagashima, Dai Okumura

    WCCM2022　2022/07

  53. Creasing Instability Analysis Focusing on Energy Barrier and Energy Bottom

    Atsuya Ogino, Seishiro Matsubara, So Nagashima, Dai Okumura

    WCCM2022　2022/07

  54. Morphological Evolution of Surface Patterns in Hydrogel Bilayers

    So Nagashima, Naoki Akamatsu, Seishiro Matsubara, Shohei Ida, Hiro Tanaka, Makoto Uchida, Dai Okumura

    WCCM2022　2022/07

  55. Crease Nucleation and Propagation from a V-shaped Notch in an Elastomer

    Daiki Nakajima, Ryogo Hoshi, Seishiro Matsubara, So Nagashima, Dai Okumura

    WCCM2022　2022/07

  56. Investigation of the linear viscoelastic property for polyacrylamide hydrogels during transient equilibrium swelling

    Seishiro Matsubara, Akira Takashima, So Nagashima, Shohei Ida, Hiro Tanaka, Makoto Uchida, Dai Okumura

    WCCM2022　2022/07

  57. Surrogate model of computational homogenization for history dependent materials

    Yosuke Yamanaka, Seishiro Matsubara, Shuji Moriguchi, Kenjiro Terada

    WCCM2022　2022/07

  58. Numerical Material Testing for Compaction Process of Powdered Materials by means of FEM

    Koji Yamamoto, Masato Somemiya, Norio Hirayama, Seishiro Matsubara, Kenjiro Terada

    WCCM2022　2022/07

  59. Estimation of Nonlinear Material Behavior for Off-axis UD-CFRTP Using Numerical Material Tests

    Masato Somemiya, Norio Hirayama, Koji Yamamoto, Seishiro Matsubara, Kenjiro Terada

    WCCM2022　2022/07

  60. Numerical Material Tests for Characterizing Macroscopic Viscoplasticity along with Static Recovery of Fiber-reinforced Thermoplastics

    JUNLAN ZHU, Seishiro Matsubara, So Nagashima, Dai Okumura

    WCCM2022　2022/07

  61. Variationally consistent crack phase-field formulation for ductile fracture

    Jike Han, Seishiro Matsubara, Shuji Moriguchi, Kenjiro Terada

    WCCM2022　2022/07

  62. 弾性体に誘起するクリースの発生と伝播の有限要素解析

    松原 成志朗,星 亮吾,永島 壮,奥村 大

    第66 回理論応⽤⼒学講演会　2022/06

  63. 非均質材料のマクロ弾塑性構成則の代理モデル

    山中 耀介, 松原 成志朗, 森口 周二, 寺田 賢二郎

    第27回計算工学講演会　2022/06

  64. Crack propagation simulations of advanced high strength steel sheet using crack phase-field model

    韓 霽珂, 松原 成志朗, 西 紳之介, 高田 賢治, 村松 眞由, 大宮 正毅, 小川 賢介, 生出 佳, 小林 卓哉, 岡東 寿明, 森口 周二, 寺田 賢二郎

    第27回計算工学講演会　2022/06

  65. リンクルからリッジへのパターン変態の有限要素分岐座屈解析析

    田中 大地, 若林 駿斗, 松原 成志朗, 永島 壮, 奥村 大

    日本計算工学会第27回計算工学講演会　2022/06

  66. 微圧縮非弾性材料の熱・機械強連成解析

    松原 成志朗, 村松 亮, 永島 壮, 奥村 大

    日本計算工学会第27回計算工学講演会　2022/06

  67. 2層構造体のリンクル解析に対するIsogeometric分岐座屈解析法の基礎的検討

    平川 明莉, 松原 成志朗, 永島 壮, 奥村 大

    日本計算工学会第27回計算工学講演会　2022/05

  68. 過渡膨潤過程におけるポリアクリルアミドゲルの粘弾性特性評価

    松原 成志朗, 高島 晃, 永島 壮, 伊田 翔平, 田中 展, 内田 真, 奥村 大

    日本材料学会第71期学術講演会　2022/05

  69. 二層ハイドロゲル表面に自律形成する凹凸パターン

    永島 壮, 赤松直紀, 松原成志朗, 奥村 大

    日本材料学会東海支部第16回学術講演会　2022/03

  70. Distortional Hardening Material Model for Unidirectioally Reinforced CFRTP Considered from the Results of Numerical Material Testing

    Koji Yamamoto, Masato Somemiya, Seishiro Matsubara, Norio Hirayama, Kenjiro Terada

    COMPOSITES2021　2021/09/23

  71. クリース伝播解析に及ぼす欠陥形状と要素分割の影響

    星 亮吾, 荻野 敦也, 松原 成志朗, 永島 壮, 奥村 大

    日本機械学会 第 34 回計算力学講演会　2021/09/21

  72. エラストマーの二次元表面不安定解析に及ぼす V 字型ノ ッチの影響

    荻野 敦也, 星 亮吾, 松原 成志朗, 永島 壮, 奥村 大

    日本機械学会 第 34 回計算力学講演会　2021/09/21

  73. 膜基盤構造体の分岐座屈解析に及ぼすヤング率比及び 幾何学的不整量の影響

    菊池 正太郎, 松原 成志朗, 永島 壮, 奥村 大

    日本機械学会 第 34 回計算力学講演会　2021/09/21

  74. V ノッチ欠陥によって誘起されるクリースの伝播

    星 亮吾, 荻野 敦也, 松原 成志朗, 永島 壮, 奥村 大

    ⽇本機械学会 M&M2021 材料⼒学カンファレンス　2021/09/16

  75. 膜・基盤構造体の表面パターン発達における分岐と変形

    菊池 正太郎, 松原 成志朗, 永島 壮, 奥村 大

    ⽇本機械学会 M&M2021 材料⼒学カンファレンス　2021/09/15

  76. 過渡膨潤状態におけるアクリルアミドハイドロゲルの弾性・粘性特性評価

    高島 晃, 松原 成志朗, 永島 壮, 伊田 翔平, 田中 展, 内田 真, 奥村 大

    ⽇本機械学会 M&M2021 材料⼒学カンファレンス　2021/09/15

  77. ゲル材料の弾性・膨潤特性に及ぼす分子鎖伸び切りの影響

    奥村 大, 古谷 徹朗, 松原 成志朗, 永島 壮

    ⽇本機械学会 M&M2021 材料⼒学カンファレンス　2021/09/15

  78. V 字型ノッチのリンクル・クリース表面不安定解析に及ぼす影響

    荻野 敦也, 星 亮吾, 松原 成志朗, 永島 壮, 奥村 大

    ⽇本機械学会 M&M2021 材料⼒学カンファレンス　2021/09/15

  79. 拡張 Flory-Rehner モデルによるハイドロゲルの膨潤弾性特性評価

    田中 展, 河合 僚太, 松原 成志朗, 伊田 翔平, 内田 真, 奥村 大

    ⽇本機械学会 M&M2021 材料⼒学カンファレンス　2021/09/15

  80. 非晶性樹脂の変形による自己発熱を考慮した有限要素解析

    松原 成志朗, 奥村 大, 永島 壮, 寺田 賢二郎

    ⽇本機械学会 M&M2021 材料⼒学カンファレンス　2021/09/15

  81. Thermo-mechanically coupled analyses for dissipative composites considering transient change of microscopic temperature

    S. Matsubara, D. Okumura, K. Terada

    COMPLAS2021　2021/09/08

  82. Fully implicit coupled analysis for finite thermo-viscoelasticity with resin cure: application to multiscale analysis

    Y. Yamanaka, S. Matsubara, S. Moriguchi, K. Terada

    COMPLAS2021　2021/09/07

  83. Crack phase-field modeling for ductile fracture coupled with non-local plasticity

    J. Han, S. Matsubara, S. Moriguchi, K. Terada

    COMPLAS2021　2021/09/07

  84. ひずみ勾配塑性論に基づくphase-field延性損傷モデル

    韓 霽珂, 松原 成志朗, 西 紳之介, 高田 賢治, 村松 眞由, 大宮 正毅, 小川 賢介, 生出 佳, 小林 卓哉, 村田 真伸, 森口 周二, 寺田 賢二郎

    第26回計算工学講演会　2021/05/28

  85. クリース発生に及ぼすV字型ノッチの影響の有限要素解析

    星 亮吾, 三好 宏明, 松原 成志朗, 奥村 大

    第26回計算工学講演会　2021/05/28

  86. 膜・基盤構造体の第二分岐座屈に及ぼすヤング率比と初期不整の影響解析

    菊池 正太郎, 三好 宏明, 松原 成志朗, 奥村 大

    第26回計算工学講演会　2021/05/28

  87. 増分型変分法による熱硬化性樹脂の有限変形粘弾性と硬化度時間発展の完全陰的熱・機械連成解析手法

    山中 耀介, 松原 成志朗, 森口 周二, 寺田 賢二郎

    第26回計算工学講演会　2021/05/26

  88. 熱弾性材料に対するマルチスケール熱・機械連成解析

    松原 成志朗, 奥村 大, 寺田 賢二郎

    第26回計算工学講演会　2021/05/26

  89. リンクル・クリース発展に及ぼす表面欠陥と要素分解能の影響解析

    荻野 敦也, 星 亮吾, 三好 宏明, 松原 成志朗, 奥村 大

    機械学会東海支部第70期講演会　2021/03

  90. アニオン性アクリルアミドゲルの膨潤・弾性相互作用の評価

    古谷 徹朗, 奥村 大, 田中 展, 松原 成志朗, 内田 真, 伊田 翔平

    機械学会東海支部第70期講演会　2021/03

  91. ゲル化により誘起される2 層ゲル膜パターンの評価・制御

    赤松直紀, 松原成志朗, 伊田翔平, 田中展, 内田真, 奥村大

    日本材料学会東海支部 第15 回学術講演会　2021/03

  92. 非均質体に対する微視的温度場の過渡現象を考慮した熱・機械連成マルチスケール解析

    松原成志朗, 奥村大

    機械学会東海支部第70期講演会　2021/03

  93. 非晶性熱可塑性樹脂の負荷速度と温度に依存する力学挙動の予測 Invited

    松原成志朗

    第39回計算数理工学フォーラム　2021/03

  94. 非晶性熱可塑性樹脂の熱・機械強連成有限要素解析

    松原成志朗, 奥村大

    日本材料学会東海支部 第15 回学術講演会　2021/03

  95. TWO-SCALE ANALYSIS OF FIBER REINFORCED PLASTICS SUBJECTED TO CURING IN FINITE STRAIN THERMO-CHEMO-VISCOELASTICITY

    Risa Saito, Yosuke Yamanaka, Seishiro Matsubara, Shuji Moriguchi, Kenjiro Terada

    14th World Congress on Computational Mechanics　2021/01

  96. Thermo-Mechanical Coupled Incremental Variational Framework for Thermosetting Resins in Consideration of Curing Process

    Yosuke Yamanaka, Risa Saito, Seishiro Matsubara, Shuji Moriguchi, Kenjiro Terada

    14th World Congress in Computational Mechanics　2021/01

  97. 現場重合型熱可塑性エポキシ樹脂の非線形力学挙動の推定

    染宮聖人, 平山紀夫, 山本晃司, 松原成志朗, 寺田賢二郎

    プラスチック成形加工学会 第28回成形加工シンポジア‘20 F-205　2020/12/02

  98. A phase-field approach for ductile fracture coupled with variational gradient plasticity at finite strains

    Jike Han, Seishiro Matsubara, Shuji Moriguchi, Kenjiro Terada

    The 3rd international conference on computational engineering and science for safety and environmental problems　2020/12

  99. Thermomechanical coupled analysis of thermoset resin by means of incremental variational method

    Yosuke Yamanaka, Seishiro Matsubara, Shuji Moriguchi, Kenjiro Terada

    The 3rd international conference on computational engineering and science for safety and environmental problems　2020/12

  100. Finite element analysis of influential factors in a three dimensional structure assembled from a gel film

    星 亮吾, 三好 宏明, 松原成志朗, 奥村 大

    The 3rd international conference on computational engineering and science for safety and environmental problems　2020/12

  101. Buckling and post-buckling analysis in surface pattern evolution from hexagonal dimples on a gel film bonded on a soft substrate

    三好宏明, 松原成志朗, 奥村大

    The 3rd international conference on computational engineering and science for safety and environmental problems　2020/12

  102. 膨潤エラストマー解析に向けたGent-Gent超弾性モデルの有限要素実装

    菊池 正太郎, 三好 宏明, 松原 成志朗, 奥村 大

    CMD2020 計力スクウェア研究報告集　2020/12

  103. 擬似非圧縮性材料に対する完全陰的熱・機械強連成解析手法の開発

    松原成志朗, 奥村大

    CMD2020 計力スクウェア研究報告集　2020/12

  104. Thermo-mechanical coupled two-scale analysis involving microscopic thermal inertia

    松原成志朗, 奥村大, 寺田賢二郎

    The 3rd international conference on computational engineering and science for safety and environmental problems　2020/12

  105. A thermo-mechanically coupled variational update for glassy amorphous polymers in consideration of the effect of mechanical entropy change

    S. Matsubara, D. Okumura, K. Terada

    IMECE2020 virtual conference　2020/11

  106. ゲル膜立体化の有限要素影響因子解析

    星 亮吾, 三好 宏明, 松原成志朗, 奥村 大

    日本機械学会2020年度年次大会　2020/09

  107. 膨潤エラストマー解析のための Gent-Gent モデルの有限要素実装

    菊池正太郎, 三好宏明, 松原成志朗, 奥村大

    日本機械学会2020年度年次大会　2020/09

  108. 硬質ゲル膜のパターン発展分岐座屈解析

    三好宏明, 松原成志朗, 奥村大

    日本機械学会2020年度年次大会　2020/09

  109. ガラス基盤上のアニオン性アクリルアミドゲル膜の立体構造構築における影響因子解析

    河合遼太, 松原成志朗, 伊田翔平, 田中展, 内田真, 奥村大

    日本機械学会2020年度年次大会　2020/09

  110. アクリルアミドハイドロゲルの粘弾性特性に及ぼす含水量の影響

    高島晃, 松原成志朗, 伊田翔平, 田中展, 内田真, 奥村大

    日本機械学会2020年度年次大会　2020/09

  111. 微視的非定常性を考慮した複合材料のマルチスケール熱伝導解析

    松原成志朗, 寺田賢二郎

    日本機械学会2020年度年次大会　2020/09

  112. 時間依存性摩擦モデルの陰的接触力更新アルゴリズムの構築とスティックスリップ現象の再現

    岡部 開, 山田 正太郎, 尾崎 伸吾, 京谷 孝史, 松原 成志朗

    第25回計算工学講演会　2020/06

  113. 熱注入によるゴムの損傷回復現象の数値シミュレーション

    野崎 陽明, 山田 正太郎, 松原 成志朗, 京谷 孝史, 尾崎 伸吾

    第25回計算工学講演会　2020/06

  114. 増分型変分法による硬化プロセスを考慮した熱硬化性樹脂の熱・機械連成解析手法

    山中 耀介, 斎藤 理沙, 松原 成志朗, 森口 周二, 寺田 賢二郎

    第25回計算工学講演会　2020/06

  115. Cam-clay modelを用いた有限変形解析における体積ロッキング現象の回避に関する検討

    窪田 友也, 山田 正太郎, 京谷 孝史, 松原 成志朗

    第25回計算工学講演会　2020/06

  116. 異方性粘弾性・粘塑性・損傷複合構成則を用いたFRTPの非線形挙動の予測

    田口尚輝, 平山紀夫, 染宮聖人, 松原成志朗, 山本晃司, 寺田賢二郎

    第11回 日本複合材料会議 (JCCM-11)　2020/03/18

  117. 数値材料試験による一方向CFRTPの異方性粘塑性材料定数の同定

    鷹見凌, 平山紀夫, 田口尚輝, 山本晃司, 松原成志朗, 寺田賢二郎

    第11回 日本複合材料会議 (JCCM-11)　2020/03/18

  118. 弾塑性摩擦モデルの陰的摩擦力更新アルゴリズムの構築とスティックスリッ プ現象の再現

    岡部 開, 山田正太郎, 京谷孝史, 松原成志朗

    土木学会東北支部 技術研究発表会　2020/03

  119. 異方性粘弾性・粘塑性・損傷複合構成則を用いたFRTPの非線形挙動の予測

    田口尚輝, 平山紀夫, 染宮聖人, 松原成志朗, 山本晃司, 寺田賢二郎

    第11回 日本複合材料会議　2020/03

  120. 数値材料試験による一方向CFRTPの異方性粘塑性材料定数の同定

    鷹見凌, 平山紀夫, 田口尚輝, 山本晃司, 松原成志朗, 寺田賢二郎

    第11回 日本複合材料会議　2020/03

  121. 変形勾配の弾塑性乗算分解に基づく有限変形解析コードの開発とその精度検証

    窪田友也, 京谷孝史, 山田正太郎, 松原成志朗

    土木学会東北支部 技術研究発表会　2020/03

  122. 熱注入によるゴムの損傷回復現象の数値シミュレーション

    野崎陽明, 山田正太郎, 京谷孝史, 松原成志朗

    土木学会東北支部 技術研究発表会　2020/03

  123. 亜弾性構成則に基づくCam-clay modelの陰的応力更新アルゴリズムの構築

    小松龍ノ介, 山田正太郎, 京谷孝史, 松原成志朗, 劉暁東

    土木学会東北支部 技術研究発表会　2020/03

  124. a dimensionality reduction method for micro-macro coupling two-scale analysis

    Ryo Hatano, Seishiro Matsubara, Kenta Tozato, Yu Otake, Shuji Moriguchi, Kenjiro Terada

    the Asian Pacific Congress on Computational Mechanics 2019　2019/12

  125. Numerical Simulation of Swelling Behavior of Rockmass by Using a Modified Cam-Clay Based Model

    Hayato Yamamoto, Takashi Kyoya, Shotaro Yamada, Seishiro Matsubara

    the Asian Pacific Congress on Computational Mechanics 2019　2019/12

  126. The factorial analysis for the creation of deformed ground strata by employing the viscoelastic-viscoplastic combined model

    Shuta kanazawa, Seishiro Matsubara, Shotaro Yamada, Takashi Kyoya

    the Asian Pacific Congress on Computational Mechanics 2019　2019/12

  127. Thermo-mechanical coupled Gradient-enhanced Two-scale Variational updates for Thermo-hyperelastic Composites

    Seishiro Matsubara, Kenjiro Terada

    the Asian Pacific Congress on Computational Mechanics 2019　2019/12

  128. A method of two-scale analysis for curing process of fiber reinforced plastics with micro-macro decoupling scheme

    Risa Saito, Yuya Yamaguchi, Seishiro Matsubara, Shuji Moriguchi, Kenjiro Terada

    the Asian Pacific Congress on Computational Mechanics 2019　2019/12

  129. A variational framework for thermo-mechanical coupled two-scale boundary value problems

    S. Matsubara, K. Terada

    XV International Conference on Computational Plasticity. Fundamentals and Applications　2019/09

  130. A variational framework for two-scale thermo-mechanical coupled problems

    K. Terada, S. Matsubara

    The 15th U.S. National Congress on Computational Mechanics　2019/07

  131. 粘弾性・粘塑性・損傷複合モデルによる熱可塑性樹脂の非線形挙動の再現と評価

    田口尚輝, 平山紀夫, 松原成志朗, 山本晃司, 寺田賢二郎

    第24回計算工学講演会　2019/05

  132. モデル次元縮約による非線形マルチスケール解析

    波多野僚, 寺田賢二郎, 森口周二, 松原成志朗, 外里健太

    第24回計算工学講演会　2019/05

  133. ２変数境界値問題に対する増分エネルギー汎関数の最小化アプローチ

    松原成志朗, 寺田賢二郎

    第24回計算工学講演会　2019/05

  134. 膨潤性地山中のトンネルに対する修正Cam-Clayモデルによる安定解析

    山本颯人, 京谷孝史, 松原成志朗

    平成30年度土木学会東北支部技術研究発表会　2019/03

  135. 粘弾性・粘塑性モデル解析による変状地層形成の要因分析

    金澤秀太, 京谷孝史, 松原成志朗

    平成30年度土木学会東北支部技術研究発表会　2019/03

  136. 一般化収束論に基づく非定常熱伝導・固体力学連成マルチスケール解析

    松原成志朗, 寺田賢二郎

    日本機械学会第31回計算力学講演会　2018/11

  137. Space-time characterization of macroscopic thermo-mechanical behavior reflecting microscopic unsteady heat conduction

    Seishiro MATSUBARA, Kenjiro TERADA

    The 13th World Congress on Computational Mechanics　2018/07

  138. FRTPの自己発熱による巨視的温度場の非定常性を考慮した構造解析手法

    波多野僚, 松原成志朗, 寺田賢二郎, 森口周二

    第23回計算工学講演会　2018/06

  139. ミクロ構造内の非定常熱伝導を考慮した熱・機械連成マルチスケール解析手法

    松原成志朗, 寺田賢二郎

    第23回計算工学講演会　2018/06

  140. Thermomechanical computational homogenization for FRTP

    K. Terada, S. Matsubara, M. Kishi, M. Muramatsu

    The 2nd International Conference on Computational Engineering and Science for Safety and Environmental Problems　2017/10

  141. Two-scale incremental variational formulation for thermo-mechanical coupled analyses of fiber reinforced thermoplastics

    Seishiro MATSUBARA, Kenjiro TERADA

    XIV International Conference on Computational Plasticity. Fundamentals and Applications　2017/09

  142. Two-scale characterization of fiber-reinforced polymers with self-heating effect

    K. Terada, S. Matsubara, M. Kishi, M. Muramatsu

    XIV International Conference on Computational Plasticity. Fundamentals and Applications　2017/09

  143. 板状デバイスの非線形マルチスケール解析を想定した数値平板試験

    佐藤維美, 村松眞由, 松原成志朗, 西紳之介, 寺田賢二郎, 八代圭司, 川田達也

    第20回応用力学シンポジウム　2017/05

  144. 板状デバイスの非弾性マルチスケール解析のための数値平板試験

    佐藤維美, 村松眞由, 松原成志朗, 西紳之介, 寺田賢二郎, 川田達也

    第22回計算工学講演会　2017/05

  145. 粘弾性・粘塑性複合構成則の開発を目的とした熱可塑性樹脂の材料試験

    前田隆世, 小林卓哉, 住山琢哉, 古市謙次, 野々村千里, 村田真伸, 西脇武志, 松原成志朗, 寺田賢二郎

    第22回計算工学講演会　2017/05

  146. ゴムの有限変形粘弾性・損傷モデルによるカーボンフィラーの影響評価

    岸正泰, 松原成志朗, 村松眞由, 寺田賢二郎

    第22回計算工学講演会　2017/05

  147. 粘弾性・粘塑性複合構成則による熱可塑性樹脂のガラス－ゴム包括力学特性評価

    松原成志朗, 寺田賢二郎, 住山琢哉, 古市謙次, 野々村千里, 前田隆世, 小林卓哉, 村田真伸, 西脇武志

    第22回計算工学講演会　2017/05

  148. 増分ポテンシャル法による熱可塑性樹脂の熱・機械強連成解析

    松原成志朗, 寺田賢二郎

    第22回計算工学講演会　2017/05

  149. Fully coupled thermomechanical analysis for microstructures of fiber-reinforced thermoplastics

    S. Matsubara, K. Terada

    Special Workshop Multiscale Modeling of Heterogeneous Structures　2016/09

  150. A new rheology-based constitutive model representing glassy and rubbery states of thermoplastic resin

    S. Matsubara, K. Terada

    The 12th World Congress on Computational Mechanics　2016/07

  151. 有限要素法を用いた陶磁器の焼成変形予測

    齋藤俊幸, 進博人, 勝田泰広, 梅田学, 生出佳, 三原康子, 寺田賢二郎, 松原成志朗

    第21回計算工学講演会　2016/06

  152. 熱可塑性樹脂およびゴム製緩衝材のエネルギー吸収性能評価

    岸正泰, 松原成志朗, 村松眞由, 寺田賢二郎

    第21回計算工学講演会　2016/06

  153. ガラス・ゴム領域における非晶性樹脂のレオロジーモデルに基づく材料構成則

    松原成志朗, 寺田賢二郎, 西脇武志, 住山琢哉, 古市謙次, 野々村千里, 生出佳, 小林卓哉

    第21回計算工学講演会　2016/06

  154. Investigation of self-heating effect in fiber-reinforced thermoplastic resin by numerical material testing

    K. Terada, S. Matsubara

    European Congress on Computational Methods in Applied Sciences and Engineering　2016/06

  155. A viscoelastic-viscoplastic combined model for thermoplastic resins

    K. Terada, S. Matsubara

    From Creep Damage Mechanics to Homogenization Methods: In honor of Professor Nobutada Ohno　2016/01

  156. 有限要素法を用いた陶磁器の乾燥変形予測

    齋藤俊幸, 寺田賢二郎, 松原成志朗, 進博人, 勝田泰広, 梅田学, 三原康子, 生出佳

    日本機械学会第28回計算力学講演会　2015/10

  157. 熱可塑性樹脂の有限ひずみ非弾性構成モデルと熱伝導との連成解析

    松原成志朗, 寺田賢二郎

    日本機械学会第28回計算力学講演会　2015/10

  158. Nonlinear homogenization with numerical material/plate testing

    K. Terada, S. Matsubara, S. Nishi

    Japan-Spain Workshop on Computational Mechanics 2015　2015/10

  159. Numerical material and plate tests: advantages and challenges

    K. Terada, S. Matsubara, S. Nishi

    XIII International Conference on Computational Plasticity. Fundamentals and Applications　2015/09

  160. 熱可塑性樹脂の有限ひずみ粘弾性・粘塑性・損傷構成則の構築

    松原成志朗, 寺田賢二郎

    日本機械学会材料力学部門若手シンポジウム2015　2015/08

  161. Numerical material testing for FRP with a finite strain viscoelastic-viscoplastic model

    S. Matsubara, K. Terada

    The 13th U.S. National Congress on Computational Mechanics　2015/07

  162. 熱可塑性樹脂の自己発熱現象を考慮した有限ひずみ粘弾性・粘塑性モデル

    松原成志朗, 高瀬慎介, 森口周二, 寺田賢二郎

    第20回計算工学講演会　2015/06

  163. Two-scale analysis of composite plates with in-plane periodic heterogeneities

    K. Terada, S. Matsubara, N. Hirayama

    1st. Pan-American Congress on Computational Mechanics　2015/04

  164. A method of two-scale analyses for heterogeneous plates and shells

    S. Matsubara, K. Terada, J. Kato, T. Kyoya, S. Moriguchi, S. Takase, F. Fujii, N. Hirayama, I. Temizer

    he 11th World Congress on Computational Mechanics　2014/07

  165. 非均質膜構造に対するマルチスケールアイソジオメトリック解析手法の提案

    松原成志朗, 寺田賢二郎, 加藤準冶, 京谷孝史, 森口周二, 高瀬慎介, 藤井文夫, Ilker Temizer, 平山紀夫

    第19回計算工学講演会　2014/06

  166. 複合板の非線形マルチスケール解析

    松原成志朗, 青葉勇樹, 高瀬慎介, 寺田賢二郎, 加藤準治, 京谷孝史, 森口周二, 平山紀夫

    第17回応用力学シンポジウム　2014/05

  167. Multi-scale iso-geometric analyses for heterogeneous membranes

    S. Matsubara, K. Terada, J. Kato, T. Kyoya, S. Moriguchi, S. Takase, F. Fujii, N. Hirayama, I. Temizer

    Computational Engineering and Science for Safety and Environmental Problems　2014/04

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Books and Other Publications 2

  1. Time-Swelling Superposition Principle for the Linear Viscoelastic Properties of Polyacrylamide Hydrogels

    Matsubara S, Takashima A, Nagashima S, Ida S, Tanaka H, Uchida M, Okumura D

    Advanced Structured Materials　2023

    DOI： 10.1007/978-3-031-39070-8_12 　

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    We study the linear viscoelastic properties of polyacrylamide hydrogels over a wide range of swelling and deswelling states. The experimental data of dynamic moduli demonstrate that deswollen hydrogels exhibit the linear viscoelastic behaviors while swollen hydrogels behave as a purely elastic material. To capture the linear viscoelastic nature of deswollen hydrogels, we advocate the time-swelling superposition principle inspired by the swelling-dependent linear viscoelasticity model. In this principle, the Williams-Landel-Ferry type equation and the scaling law prescribe the horizontal and vertical shift factors as a function of the volume swelling ratio, making it possible to organize the dynamic moduli in the deswelling state. The resulting master curves elucidate that the dynamic moduli have a positive power-law correlation with the angular frequency. In addition, two shift factors reveal that deswelling enhances both frequency sensitivity and elastic property in dynamic moduli. The scaling exponents of the elastic moduli in the deswelling state are, in particular, larger than those in the swelling state, regardless of the contents of monomer and cross-linker. The generalized Maxwell model equipped with identified material parameters quantifies the linear viscoelastic behaviors that depend on frequency and water content.

  2. A viscoelastic-viscoplastic combined constitutive model for thermoplastic resins”, In: E. Oñate, D. Peric, E. de Souza Neto and M. Chiumenti (eds), Advances in Computational Plasticity

    松原成志朗, 寺田賢二郎

    Springer International Publishing AG　2018/01

Industrial Property Rights 1

  1. 衛生陶器の製造時の変形予測方法

    斉藤 俊幸, 進 博人, 梅田 学, 勝田 泰広, 松原 成志朗, 寺田 賢二郎, 生出 佳, 三原 康子, 小林 卓哉

    Property Type: Patent

Research Projects 8

  1. 摂動解析の動的非線形化による凸凹パターン変態の全貌解明

    奥村 大, 永島 壮, 松原 成志朗

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 挑戦的研究(開拓)

    Institution: 名古屋大学

    2022/06/30 - 2025/03/31

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    本研究では，摂動解析の動的非線形化による凸凹パターン変態の全貌解明を目的とする研究課題に取り組んでおり，今年度の研究業績は以下のようにまとめられる．まず，摂動解析の動的非線形化による孤立クリースの基礎的解析の研究項目について，この手法を用いて，リンクル開始点からクリース開始点に繋がる不安定経路の存在を明らかにした．また，連鎖モデルを新しく構築して理論的な説明とパラメータ同定にも成功しており，論文を投稿準備中，次年度中に論文化する見込みである．続いて，クリース解析におけるメッシュ依存性の制御方法の解析基盤構築の研究項目について，上述の不安定経路の解析によって，クリースの前駆変形の特徴寸法と要素分割の関係が明らかとなっており，これらの情報に基づく基盤構築が予定されている．さらに，プレパターンを用いた３次元凸凹パターン変態の評価・観察手法構築の研究項目では，ゲル化過程のダイナミクスに基づくパターン変態観察手法の開発に成功しており（Nagashima et al., Langmuir, 2023），この手法と組み合わせて研究を進める．プレパターン作成のために，次年度，３次元プリンタを購入して取り組む．その他の実績としては，ゲルの粘弾性特性を研究した論文が掲載可（Matsubara et al., Adv. Struct. Mater., accepted）となっており，リンクルパターンからリッジと呼ばれる波長に対して振幅の大きなパターンの発生機構の解析の分岐座屈特性も明らかとなった（田中ら，計算数理工学論文集，2022）．これらの成果も，今後の研究の展開に関わる材料物性や変態特性を含んでおり，相乗的な進展を期待している．

  2. Coexistence of wrinkles and folds in film&#8211;substrate systems in contact with water droplets

    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: Nagoya University

    2022/04/01 - 2025/03/31

  3. Computational homogenization of soft composite plates and shells toward elucidating high-order geometrical pattern transformation

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Early-Career Scientists

    Institution: Nagoya University

    2022/04 - 2025/03

  4. Release of Potential Self-Healing Ability of Seismic Isolation Rubber Bearings by Thermal Injection Competitive

    Yamada Shotaro

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Challenging Research (Exploratory)

    Institution: Tohoku University

    2020/07 - 2023/03

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    When subjected to a cyclic loading, rubber exhibits a hysteresis behavior due to internal damage, known as the Mullins effect. Rubber has a self-healing ability and can recover slowly over time. This damage recovery phenomenon of rubber can be accelerated by injecting heat from the outside. In this study, we developed a mathematical model that can describe such a series of phenomena. In addition, the numerical analysis illustrates that the seismic isolation function of a structure can be restored by recovering from the damage of rubber isolation bearings caused by earthquake damage.

  5. Thermo-mechanical coupled gradient-enhanced reduced order multi-scale analysis for the next-generation material design

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists

    Category: Grant-in-Aid for Early-Career Scientists

    Institution: Nagoya University

    2020/04 - 2022/03

  6. Space-time homogenization for fully thermo-mechanical coupled problems

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity start-up

    Category: Grant-in-Aid for Research Activity start-up

    Institution: Tohoku University

    2018/08/24 - 2020/03/31

  7. Development of multiscale multi-physics rock mechanics for swelling rock mass

    Kyoya Takashi

    Institution: Tohoku University

    2016/04 - 2020/03

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    In order to resolve the problem of deterioration of underground structures after construction due to swelling of rock mass we have developed a new multiscale multi-physics rock mechanics approach. We carried out laboratory swelling tests of montmorillonite and formulated a thermodynamics model for the swelling behavior. We also formulated a numerical analysis model based on the modified Cam-Clay model that can predict deteriorating strength and stiffness of rock mass along with a rigorous return-mapping algorism. Then we developed a multiscale multi-physics analysis model for swelling rock mass by Incorporating the thermodynamics swelling model into the Cam-Clay type model. A series of analyses of a tunnel within a swelling rock mass predicted displacement and stress distribution around the tunnel in good agreement with measured data. We conclude therefore the validity and effectiveness of this proposed multiscale multi-physics rock mechanics theoretical model.

  8. Method of multistage failure simulation for disaster risk evaluation

    Terada Kenjiro

    Institution: Tohoku University

    2016/04 - 2019/03

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    Based on the co-rotational formulation to deal with large displacements and rotations of a solid, we propose a method of multi-stage failure simulation of brittle materials and structures involving dynamic frictional-contact behavior. In order to simulate dynamic behavior of the structure, we adopted mid-point algorithm along with energy-momentum method. Also, we employed the penalty method to represent the brittle fracture due to gluing/separation of the elements, and the augmented Lagrange method to consider the frictional contact effects. Verification tests were conducted for the formulation with a simple structure subjected to the large displacements and rotations. Also, some simple numerical examples were presented to demonstrate the capability of the proposed method to simulate the multi-stage failure process.

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