Shizawa, Kazuyuki

写真a

Affiliation

Faculty of Science and Technology, Department of Mechanical Engineering (Yagami)

Position

Professor

External Links

Career 【 Display / hide

  • 1988.09
    -
    1989.03

    慶應義塾大学理工学部(機械工学実験) ,非常勤講師

  • 1989.04
    -
    1992.03

    慶應義塾大学理工学部 ,助手

  • 1992.04
    -
    1996.03

    慶應義塾大学理工学部 ,専任講師

  • 1996.04
    -
    2004.03

    慶應義塾大学理工学部(機械工学科) ,助教授

  • 1996.09
    -
    1997.09

    ワシントン州立大学 ,訪問教授

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Academic Background 【 Display / hide

  • 1981.03

    Keio University, Faculty of Engineering, 機械工学科

    University, Graduated

  • 1984.03

    Keio University, Graduate School, Division of Engineering, 機械工学専攻

    Graduate School, Completed, Master's course

  • 1987.03

    Keio University, Graduate School, Division of Engineering, 機械工学専攻

    Graduate School, Withdrawal after completion of doctoral course requirements, Doctoral course

Academic Degrees 【 Display / hide

  • Ph.D., Keio University, Coursework, 1987.07

 

Books 【 Display / hide

  • LPSO型マグネシウム合金の材料科学(実用段階に入った日本発の新合金)

    SHIZAWA KAZUYUKI, 日経BPコンサルティング, 2018.02

    Scope: 第4章, 第2節

Papers 【 Display / hide

  • Development of phase-field model based on balance laws and thermodynamic discussion

    Muramatsu M., Shizawa K.

    AIP Advances (AIP Advances)  10 ( 9 )  2020.09

    Research paper (scientific journal), Joint Work, Accepted

     View Summary

    © 2020 Author(s). In this work, a phase-field model for recrystallization is developed based on the conservation laws. There has been no attempt to develop a phase-field model of recrystallization based on the conservation laws, even though various phase-field simulation models to reproduce the recrystallization phenomenon have been proposed. However, it is unclear what conservation laws are required for such a model. In the previous paper, toward solving this problem, we developed conservation laws of mass, momentum, angular momentum, and energy and a law of entropy at the lattice scale for the process of recrystallization. In this paper, first, two continuous variables, i.e., the order parameter and crystal orientation, are introduced into the balance equation of mass for a single phase and that of angular momentum for the lattice, respectively. Next, the fluxes of the order parameter and crystal orientation are derived from the law of entropy by the use of rational thermodynamics. Moreover, the diffusion coefficient and mass source are modeled to derive the evolution equations, i.e., phase-field equations of the order parameter and crystal orientation. Finally, for the phase-field equation of the crystal orientation, neglecting the conservative part and integrating the equation with respect to time under the first-order approximation, a phase-field model that is used for stable calculations is developed. This work aims to develop a phase-field theory on the basis of the change in crystal lattice during recrystallization. This paper gives a physical background to the methodological phase-field approach in the case of recrystallization.

  • Modelling and simulation of dynamic recrystallisation based on multi-phase-field and dislocation-based crystal plasticity models

    Kujirai S., Shizawa K.

    Philosophical Magazine (Philosophical Magazine)  100 ( 16 ) 2106 - 2127 2020.04

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  14786435

     View Summary

    © 2020, © 2020 Informa UK Limited, trading as Taylor & Francis Group. The mechanical properties of metals used as structural materials are significantly affected by hot (or warm) plastic working. Therefore, it is industrially important to predict the microscopic behaviour of materials in the deformation process during heat treatment. In this process, a number of nuclei are generated in the vicinity of grain boundaries owing to thermal fluctuation or the coalescence of subgrains, and dynamic recrystallisation (DRX) occurs along with the deformation. In this paper, we develop a DRX model by coupling a dislocation-based crystal plasticity model and a multi-phase-field (MPF) model through the dislocation density. Then, the temperature dependence of the hardening tendency in the recrystallisation process is introduced into the DRX model. A multiphysics simulation for pure Ni is conducted, and then the validity of the DRX model is investigated by comparing the numerical results of microstructure formation and the nominal stress–strain curve during DRX with experimental results. The obtained results indicate that in the process of DRX, nucleation and grain growth occur mainly around grain boundaries with high dislocation density. As deformation progresses, new dislocations pile up and subsequent nucleation occurs in the recrystallised grains. The influence of such microstructural evolution appears as oscillation in the stress–strain curve. From the stress–strain curves, the temperature dependence in DRX is observed mainly in terms of the yield stress, the hardening ratio, and the change in the hardening tendency after nucleation occurs.

  • Multi-phase-field モデルおよび転位-結晶塑性モデルに基づくLPSO 型Mg二相合金に対する動的再結晶シミュレーション

    鯨井翔, 志澤一之

    日本機械学会論文集 (日本機械学会)  86 ( 882 ) 1 - 18 2020.02

    Research paper (scientific journal), Joint Work, Accepted

  • Crystal plasticity FE simulation for kink band formation in Mg-based LPSO phase using dislocation-based higher-order stress model

    Kimura, Y., Ueta, R. and Shizawa, K.

    Mechanical Engineering Journal (The Japan Society of Mechanical Engineers)  7 ( 4 ) 1 - 19 2020.02

    Research paper (scientific journal), Joint Work, Accepted

     View Summary

    The dislocation-based crystal plasticity model considering higher-order stress has been constructed and a finite element (FE) analysis is conducted for both a single crystal and polycrystal with a long-period stacking ordered (LPSO) phase on the basis of the obtained model. The mesh dependence of the kink band formation is discussed from the viewpoints of the strain gradient, size effect and higher-order boundary condition. Then, it is shown that the mesh dependence of kink deformation in the FE analysis can be removed even when the scale ratio is relatively small. The width of the kink band is determined by the intrinsic length scale. When the kink band occurs in the entire specimen, work hardening can be reproduced by appropriately defining the boundary conditions for slip. The effect of the micro-scale ratio on the kink deformation is small. The disclination quadrupole structure in the kink band can be expressed qualitatively by using the incompatibility of crystal slip. Moreover, it is shown the back stress behaves as the resistance to the slip deformation in a polycrystal consisting of LPSO phases in shape of rectangular strip.

  • FE simulation on kink band formation of magnesium-based LPSO phase using dislocation-crystal plasticity model based on higher-order stress theory

    SHIZAWA K.

    Keikinzoku/Journal of Japan Institute of Light Metals (Keikinzoku/Journal of Japan Institute of Light Metals)  70 ( 5 ) 204 - 211 2020

    ISSN  04515994

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Papers, etc., Registered in KOARA 【 Display / hide

Reviews, Commentaries, etc. 【 Display / hide

  • 異種変形モードの核生成制御による高強度・高延性金属の実現

    SHIZAWA KAZUYUKI

    まてりあ ((一社)金属学会)  60 ( 1 ) 8 - 12 2021.01

    Introduction and explanation (scientific journal), Joint Work

  • 高次応力理論に基づく転位-結晶塑性モデルを用いたMg基LPSO相のキンク帯形成に関するFEM解析

    SHIZAWA KAZUYUKI

    軽金属 ((一社)軽金属学会)  70 ( 5 ) 204 - 211 2020.04

    Introduction and explanation (scientific journal), Single Work

  • 非線形FEMシミュレーションによる高分子材料の損傷・破壊挙動

    SHIZAWA KAZUYUKI

    成形加工 (プラスチック成形加工学会)  28 ( 9 ) 362 - 366 2016.08

    Introduction and explanation (scientific journal), Single Work

  • マルチスケールおよびマルチフィジックス結晶塑性解析

    SHIZAWA KAZUYUKI

    ふぇらむ (日本鉄鋼協会)  19 ( 11 ) 835 - 840 2014.11

    Introduction and explanation (scientific journal), Single Work

Presentations 【 Display / hide

  • Managing both high strength and large ductility by controlling deformationmodes in nanostructured metals

    Tsuji,N., Murayama,M., Shimokawa,T., Shizawa, K. and Kishida,K.

    Materials Research Meeting 2021 (MRM2021) (Yokohama, Japan.) , 2021.12, Oral Presentation(key)

  • 転位セル崩壊と損傷進展を考慮した純鉄単結晶の繰返し負荷挙動に関する転位-結晶塑性FEM解析

    SHIZAWA KAZUYUKI

    日本材料学会第7回材料WEEK (オンライン) , 2021.10, Oral Presentation(general), 日本材料学会

  • LPSO型Mg合金におけるRidge形キンクが負荷-逆負荷時の加工硬化に及ぼす影響に関する回位-結晶塑性FEM解析

    SHIZAWA KAZUYUKI

    第34回計算力学講演会 (オンライン(北海道大学札幌キャンパス)) , 2021.09, Oral Presentation(general), 日本機械学会

  • 結晶性ポリマに対する結晶成長則の検討および寸法依存性に関する分子鎖塑性FEM解析

    SHIZAWA KAZUYUKI

    第34回計算力学講演会 (オンライン(北海道大学札幌キャンパス)) , 2021.09, Oral Presentation(general), 日本機械学会

  • 自動その場観察システムによる疲労き裂発生過程における純鉄多結晶材の連続観察

    SHIZAWA KAZUYUKI

    M&M2021材料力学カンファレンス講演会 (オンライン) , 2021.09, Oral Presentation(general), 日本機械学会

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Research Projects of Competitive Funds, etc. 【 Display / hide

  • LPSO/Mg合金の強化に関する大変形回位-結晶塑性モデルとメッシュフリー解析

    2020.04
    -
    2023.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, 志澤 一之, Grant-in-Aid for Scientific Research (C), Principal Investigator

Awards 【 Display / hide

  • (公社)日本材料学会令和元年度塑性工学部門委員会優秀学生講演発表賞(指導学生受賞)

    古賀健太郎, 志澤一之, 2019.11, (公社)日本材料学会, サブグレインからの核生成に対する結晶方位変化を考慮したMulti-phase-fieldモデルの提案

    Type of Award: Awards of National Conference, Council and Symposium.  Country: 日本

  • (公社)日本材料学会令和元年度塑性工学部門委員会優秀学生講演発表賞(指導学生受賞)

    徐 弘, 豊田修矢, 早川守, 斉藤岳行, 山本三幸, 岡村一男, , 志澤一之, 2019.11, (公社)日本材料学会, 損傷進展を考慮した純鉄単結晶の負荷挙動に関する転位-結晶塑性FEM解析

    Type of Award: Awards of National Conference, Council and Symposium.  Country: 日本

  • 2019 Materials and Mechanics Division Achievements Award

    Kazuyuki Shizawa, 2019.11, The Japan Society of Mechanical Engineers

    Country: Japan

     View Description

    For his pioneer works on multiscale analysis for deformation and fracture of polymers

  • 2018 Computational Mechanics Achievements Award

    Kazuyuki Shizawa, 2018.11, The Japan Society of Mechanical Engineers

    Country: Japan

     View Description

    Foe his Distinguished achievements in the field of computational mechanics

  • 平成29年度日本材料学会論文賞

    上田亮, 志澤一之, 2018.05, 日本材料学会, 転位-結晶塑性シミュレーションによるMg基LPSO相単結晶におけるキンク帯形成位置の検討

    Country: 日本

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Courses Taught 【 Display / hide

  • SPECIAL LECTURE SERIES ON MULTIDISCIPLINARY AND DESIGN SCIENCE

    2021

  • SCIENCE OF SELF-ASSEMBLY

    2021

  • NONLINEAR SOLID MECHANICS

    2021

  • MECHANICS OF MATERIALS

    2021

  • INTRODUCTION TO MATERIALS SCIENCE

    2021

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Social Activities 【 Display / hide

  • (国研)科学技術振興機構未来社会創造事業「持続可能な社会の実現」領域外部専門家

    (国研)科学技術振興機構

    2020.07
    -
    2020.10
  • (独)大学改革支援・学位授与機構国立大学教育研究評価委員会専門委員

    (独)大学改革支援・学位授与機構

    2020.02
    -
    2021.03
  • (国研)科学技術振興機構未来社会創造事業「持続可能な社会の実現」領域外部専門家

    2019.07
    -
    2019.10
  • (国研)科学技術振興機構さきがけ領域アドバイザ

    2019.04
    -
    Present
  • (独)日本学術振興会国際事業委員会書面評価員

    2015.08
    -
    2016.03

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Memberships in Academic Societies 【 Display / hide

  • (社)日本鉄鋼協会 正会員, 

    2010.01
    -
    Present
  • (社)日本塑性加工学会 正員, 

    1999.10
    -
    Present
  • (社)日本金属学会 正員, 

    1999.09
    -
    Present
  • Society of Engineering Science, 

    1998.09
    -
    2002.12
  • (社)日本材料学会 正員, 

    1996.04
    -
    Present

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Committee Experiences 【 Display / hide

  • 2021.06
    -
    Present

    第70期編集委員会査読委員, (公社)日本材料学会

  • 2021.06
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    Present

    事業企画委員会副委員長, (公社)日本工学会

  • 2021.03
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    Present

    代議員, (公社)日本材料学会

  • 2020.06
    -
    Present

    塑性工学部門委員会委員長, (公社)日本材料学会

  • 2020.06
    -
    2021.05

    副会長, (一社)日本塑性加工学会

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