Faculty Profiles - OKUMURA, Dai

Papers - OKUMURA, Dai

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Long-wage in-plane buckling of elastoplastic square honeycombs Reviewed

K. Erami, N. Ohno, D. Okumura

International Journal of Plasticity Vol. 22 page： 1569-1585 2006

単軸圧縮を受ける立方体フォームの長波長座屈 Reviewed

奥村　大，岡田篤志，大野信忠

計算数理工学論文集 Vol. 6 page： 55-60 2006

Long-wave in-plane buckling of elastic square honeycombs Reviewed

D. Okumura, N. Ohno, T. Niikawa

Mechanics of Advanced Materials and Structures Vol. 12 page： 175-183 2005

均質化理論による周期セル状固体の微視的分岐と巨視的不安定の解析 Invited

奥村　大，大野信忠

計算数理工学レビュー Vol. 2005 ( 2 ) page： 11-18 2005

非局所結晶塑性を考慮した均質化理論による多結晶塑性解析（粒界でのすべりの境界条件の影響） Reviewed

奥村　大，東　洋一，大野信忠

計算数理工学論文集 Vol. 5 page： 25-30 2005

非局所結晶塑性を考慮した均質化理論の構築と有限要素離散化 Reviewed

奥村　大，東　洋一，大野信忠

材料 Vol. 54 page： 909-914 2005

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

本研究では，非局所結晶塑性を考慮した均質化理論を構築し，その有限要素離散化の方法を示す．このため，周期単位境界上での付加的な境界条件にはY周期境界条件が用いられる．また，接線係数法の適用によって，応力の釣合い式と高次応力の釣合い式，巨視的応力がマトリックス連成した有限要素方程式が得られることを示す．

* Elastoplastic Microscopic Bifurcation and Post-Bifurcation Behavior of Periodic Cellular Solids Reviewed

D. Okumura, N. Ohno and H. Noguchi

Journal of the Mechanics and Physics of Solids Vol. 52 ( 3 ) page： 641-666 2004

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

In this study, a general framework is developed to analyze microscopic bifurcation and post-bifurcation behavior of elastoplastic, periodic cellular solids. The framework is built on the basis of a two-scale theory, called a homogenization theory, of the updated Lagrangian type. We thus derive the eigenmode problem of microscopic bifurcation and the orthogonality to be satisfied by the eigenmodes. The orthogonality allows the macroscopic increments to be independent of the eigenmodes, resulting in a simple procedure of the elastoplastic post-bifurcation analysis based on the notion of comparison solids. By use of this framework, then, bifurcation and post-bifurcation analysis are performed for cell aggregates of an elastoplastic honeycomb subject to in-plane compression. Thus, demonstrating a basic, long-wave eigenmode of microscopic bifurcation under uniaxial compression, it is shown that the eigenmode has the longitudinal component dominant to the transverse component and consequently causes microscopic buckling to localize in a cell row perpendicular to the loading axis. It is further shown that under equi-biaxial compression, the flower-like buckling mode having occurred in a macroscopically stable state changes into an asymmetric, long-wave mode due to the sextuple bifurcation in a macroscopically unstable state, leading to the localization of microscopic buckling in deltaic areas.

Long-wave buckling of elastic square honeycombs subject to in-plane biaxial compression Reviewed

N. Ohno, D. Okumura, T. Niikawa

International Journal of Mechanical Sciences Vol. 46 page： 1697-1713 2004

均質化理論を用いたクロスプライ積層板の層間およびその近傍における微視的３次元解析 Reviewed

松田哲也，奥村　大，大野信忠，徳田正孝

計算数理工学論文集 Vol. 4 2004

非弾性周期構造材料に対するマルチスケール増分解析アルゴリズム

浅田崇史，大野信忠，奥村　大

第１７回計算力学講演会講演論文集 page： 711-712 2004

均質化理論に基づく正方形ハニカムの微視的分岐と巨視的不安定の解析

新川岳史，奥村　大，大野信忠

東海支部第５３期総会講演会講演論文集 page： 25-26 2004

均質化理論に基づく非局所結晶塑性の有限要素解析

奥村　大，大野信忠，東　洋一

第１７回計算力学講演会講演論文集 page： 709-710 2004

Long-wave buckling of square honeycombs subject to in-plane compression

D. Okumura, N. Ohno and T. Niikawa

International Workshops on Advances in Computational Mechanics (IWACOM) page： 59 2004

均質化理論に基づく非局所結晶塑性の有限要素解析手法の構築

奥村　大，大野信忠，東　洋一

第４８回日本学術会議材料研究連合講演会講演論文集 page： 237-238 2004

Multiscale instability analysis of corrugated fiberboard

H. Noguchi, N. Ohno and D. Okumura

2nd International Conference on Multiscale, Materials Modeling (MMM-II) page： CDROM 2004

Three-Dimensional Microscopic Analysis of Inter-Laminar Area in Cross-Ply Laminate Using a Homogenization Theory

T. Matsuda, D. Okumura, N. Ohno and M. Tokuda

Proc. the 2004 Int. Symp. on Micro-Nano Mechatronics and Human Science & The Fourth Symp. "Micro-Nano Mechatronics for an Information-Based Society" The 21st Century COE Program page： 81-86 2004

Multiscale buckling analyses of corrugated fiberboard

H. Noguchi, N. Ohno and D. Okumura

International Congress of Theoretical and Applied Mechanics (ICTAM04) page： CDROM 2004

Elastoplastic microscopic bifurcation and post-bifurcation behavior of periodic cellular solids

N. Ohno, D. Okumura and H. Noguchi

International Congress of Theoretical and Applied Mechanics (ICTAM04) page： CDROM 2004

Microscopic Bifurcation and Post-Bifurcation Behavior of Periodic Cellular Solids

N. Ohno, D. Okumura and H. Noguchi

Proceedings of ICES2004 page： CDROM 2004

Microscopic Bifurcation Analysis for Long-Wave In-Plane Buckling of Elastic Square Honeycombs

D. Okumura, N. Ohno and T. Niikawa

Proceedings of ICES2004 page： CDROM 2004

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