Matsui, Kazumi

Affiliation

Faculty of Environment and Information Sciences, Division of Artificial Environment and Information

Job Title

Associate Professor

Date of Birth

1975

Research Fields, Keywords

Nonlinear Finite Element Method, Multi-Scale Analysis, Homogenization Method, Topology Optimization

Related SDGs




Graduate School 【 display / non-display

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    2000

    Tohoku University  Graduate School, Division of Engineering  Department of Civil Engineering  Master Course  Completed

Degree 【 display / non-display

  • Doctor of Engineering -  Tohoku University

Campus Career 【 display / non-display

  • 2010.07
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    Now

    Duty   Yokohama National UniversityFaculty of Environment and Information Sciences   Division of Artificial Environment and Information   Associate Professor  

  • 2006.04
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    2010.06

    Duty   Yokohama National UniversityResearch Institute of Environment and Information Sciences   Division of Artificial Environment and Information   Lecturer  

  • 2003.12
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    2006.03

    Duty   Yokohama National UniversityResearch Institute of Environment and Information Sciences   Division of Artificial Environment and Information   Research Associate  

  • 2018.04
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    Now

    Concurrently   Yokohama National UniversityGraduate School of Environment and Information Sciences   Department of Information Environment   Associate Professor  

  • 2017.04
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    Now

    Concurrently   Yokohama National UniversityCollege of Engineering Science   Department of Mechanical Engineering, Materials Science and Ocean Engineering   Associate Professor  

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External Career 【 display / non-display

  • 2003.04
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    2003.11

    National Institute of Advanced Industrial Science and Technology (AIST)   Research Institute for Computational Science  

Academic Society Affiliations 【 display / non-display

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    Japan Society of Civil Engineering

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    The Japan Society for Computational Engineering and Science

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    The Japan Society of Mechanical Engineers

Field of expertise (Grants-in-aid for Scientific Research classification) 【 display / non-display

  • Materials/Mechanics of materials

  • Structural engineering/Earthquake engineering/Maintenance management engineering

  • Computational science

  • Computational mechanics

 

Books 【 display / non-display

  • Computational methods for plasticity

    (Part: Joint Translation )

    2012.06 ISBN: 4627920210

Papers 【 display / non-display

  • APPLICATION OF NUMERICAL PROCEDURE FOR CONNECTING STRUCTURAL AND CONTINUUM ELEMENTS TO ELASTOPLASTIC ANALYSIS FOR STEEL STRUCTURES

    YAMAMOTO Takeki, YAMADA Takahiro, MATSUI Kazumi, SAIKI Isao

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) ( Japan Society of Civil Engineers )  74 ( 2 )   I_147 - I_158   2018

    Joint Work

     View Summary

    In the finite element analysis, it is important to evaluate the local behavior at the portion where the thickness is discontinuous or near the corners. If such structure is discretized with structural elements, the numerical results are often unreliable, because the plane stress condition is assumed in the transverse direction and the incompressibility could not be considered appropriately. Thus, the authors proposed that the effective procedure of discretizing the model is to connect shell and solid elements properly by using Nitsche's method.<br>When the different types of elements are connected at the boundary including corners, the stiffness near such boundary may become larger than that of the model discretized with only one type of element. Thus, the authors propose the approach to avoid this problem by improving the mesh geometry near the boundary.<br>The proposed procedure can be applied to the elastoplastic problems, but it is necessary to divide the domain so that the plastic region does not progress on the connecting interface. This is because the numerical calculation becomes unstable due to the disorder of the stress state when discontinuous stress state is connected.<br>This paper presents a numerical procedure for connecting shell and solid elements in elastoplastic problems. In the proposed approach, shell and solid elements can be coupled with reasonable deformation near the connecting interface, only when the plastic range is not included on the connecting interface.

    DOI CiNii

  • A study on a simple modeling between Fe and Fe<sub>3</sub>C for the micro structural analysis of a carbon steel

    SUZUKI Sho, NAKAMURA Shintaroh, MATSUI Kazumi

    The Proceedings of the Materials and Mechanics Conference ( The Japan Society of Mechanical Engineers )  2018 ( 0 )   2018

    Joint Work

     View Summary

    <p>Steel materials typified by carbon steel are one of the important materials of social infrastructure. When handling these materials in numerical simulation, they are generally modeled as homogeneous continuum. This is because microscopic structures having various orientations are randomly combined, and as macroscopically can be considered as an isotropic body as a result. On the other hand, each such microscopic structure has a complicated structure. The microscopic structure of steel, in particular the kinematic behavior of cementite, is closely related to the ductile fracture of steel materials. That is, cementite in the steel material cracks during loading, and the void formed in the cracked region spreads, eventually leading to ductile fracture. When considering this series of phenomena as the progress of damage inside the material, it is interesting to see how the damage progresses. In the concept of continuum damage mechanics, not only general variables used for description of deformation, but also new internal variables with unique relationship with internal damage process are introduced to express damage inside the material. Alternatively, using multi-scale analysis based on homogenization method, it is possible to reflect the mechanical response of the microscopic structure as the material property of the macroscopic structure. By using this method, we can express internal damage of the material without preparing new variables representing damage. In this research, we focus on the growth behavior of the voids in the microstructure of the carbon steel after voids are generated, and propose a simple model that characterizes the growth phenomenon. Then, using this model, we perform micro and macro structure coupled analysis based on homogenization method.</p>

    DOI CiNii

  • Ductile fracture simulation under multi-axial loading

    SUGIYAMA Hirofumi, MATSUI Kazumi, YAMADA Takahiro, OKAZAWA Shigenobu

    The Proceedings of The Computational Mechanics Conference ( The Japan Society of Mechanical Engineers )  2018 ( 0 )   2018

    Joint Work

     View Summary

    <p>In this paper, ductile fracture simulation under the multiaxial loading is examined. Ductility of the material is considered by damage model, moreover, crack propagation is described by the finite cover method. Predicting the crack propagation phenomena about the metal material is necessary for the engineering field. Finite element method (FEM) is widely used to predict the metalworking and fracture process involves necking, crack, and failure. However, FEM is not good at predicting crack propagation. The generalized finite element method is good at describing discontinuous field like a fracture. Finite cover method(FCM), which defines the multiple covers, is one of the candidates to describe the discontinuous deformation. Moreover, a lot of constitutive equation has devised in order to deal with complex material behavior. Though there are many material constants, they sometimes have no physical meaning. In this study, a simplified Lemaitre model with FCM is employed to crack propagation simulation under multi-axial loading by applying different combinations of normal and transverse loads to the model. Some respective examples show the result of crack propagation and examine the effect of the multi-axial loading.</p>

    DOI CiNii

  • Development of Finite Cover Method Avoiding the Volumetric Locking for Crack Propagation

    Hirofumi Sugiyama, Kazumi Matsui and Takahiro Yamada

    Transaction of JSCES ( Japan Society for Computational Engineering and Sciences )  2016   2016.10  [Refereed]

    Joint Work

  • Curvature sensitive analysis of axially compressed cylindrical tubes with corrugated surface using isogeometric analysis and experiment

    Takuma Imai, Tadahiro Shibutani, Kazumi Matsui, Seitoku Kumagai, Dang Tien Tran, Kaiyuan Mu, Takash … Show more authors

    Computer Aided Geometric Design ( Elsevier )    2016  [Refereed]

    Joint Work

    DOI

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Academic Awards Received 【 display / non-display

  • JSCES Young Investigator's Award

    2006.05    

Grant-in-Aid for Scientific Research 【 display / non-display

  • Grant-in-Aid for Young Scientists(B)

    Project Year: 2011.04  -  2013.03  Investigator(s): Kazumi Matsui

  • Grant-in-Aid for Scientific Research(B)

    Project Year: 2010.04  -  2013.03 

  • Grant-in-Aid for Scientific Research(B)

    Project Year: 2010.04  -  2013.03 

  • Grant-in-Aid for Scientific Research(C)

    Project Year: 2009.04  -  2012.03 

  • Grant-in-Aid for Scientific Research(C)

    Project Year: 2006.04  -  2009.03 

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Social Contribution(Extension lecture) 【 display / non-display

  • International Workshops on Advances in Computational Mechanics

    2010.03
     
     

  • International Workshops on Advances in Computational Mechanics

    2004.11