Details of a Researcher - Shizawa, Kazuyuki

Shizawa, Kazuyuki

写真a

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

Position: Professor

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Career 【 Display / hide 】

1988.09

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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

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1992.03

慶應義塾大学理工学部 ,助手
1992.04

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1996.03

慶應義塾大学理工学部 ,専任講師
1996.04

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2004.03

慶應義塾大学理工学部（機械工学科） ,助教授
1996.09

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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

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Academic Degrees 【 Display / hide 】

Ph.D., Keio University, Coursework, 1987.07

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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

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Papers 【 Display / hide 】

Disclination-based crystal plasticity FE analysis for influence of kink formation and grain size on material strength in dual-phase Mg alloy with LPSO phase

小倉和也, 池隼佑, 志澤一之

材料（日本材料学会) 72 （ 11 ） 790 - 797 2023.11

Research paper (scientific journal), Joint Work, Accepted
- Access to Document (DOI)
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

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© 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.
- Access to Document (DOI)
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

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© 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.
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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
- Access to Document (DOI)
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

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

Triple-scale dislocation-crystal plasticity modeling for evaluation on mechanical properties of ultrafine-grained metal

Shizawa, Kazuyuki

科学研究費補助金研究成果報告書 2011

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Reviews, Commentaries, etc. 【 Display / hide 】

結晶塑性モデルの現状と課題

SHIZAWA KAZUYUKI

ぷらすとす ((一社)日本塑性加工学会) 6 ( 61 ) 1 - 2 2023.01

Article, review, commentary, editorial, etc. (scientific journal), Joint Work, Lead author
- Access to Document (DOI)
マルチフィジックス結晶塑性解析

SHIZAWA KAZUYUKI

ぷらすとす ((一社)日本塑性加工学会) 6 ( 61 ) 9 - 12 2023.01

Article, review, commentary, editorial, etc. (scientific journal), Joint Work, Lead author
- Access to Document (DOI)
HCP結晶における双晶の形成と収縮に伴う力学応答

SHIZAWA KAZUYUKI

まてりあ ((一社)金属学会) 62 ( 1 ) 35 - 39 2023.01

Article, review, commentary, editorial, etc. (scientific journal), Joint Work
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

Article, review, commentary, editorial, etc. (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

Article, review, commentary, editorial, etc. (scientific journal), Single Work

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Presentations 【 Display / hide 】

TRIP鋼における強度と延性の粒径依存性に関するPhase-field・転位-結晶塑性FEM解析

SHIZAWA KAZUYUKI

第36回計算力学講演会 (豊橋市(豊橋商工会議所)) ,

2023.10
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Oral presentation (general), 日本機械学会
Phase-field法および結晶塑性解析による3次元多結晶体Dual Phase鋼の力学特性評価

SHIZAWA KAZUYUKI

第36回計算力学講演会 (豊橋市(豊橋商工会議所)) ,

2023.10
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Oral presentation (general), 日本機械学会
準安定オーステナイト鋼におけるマルテンサイト変態に関するMulti-phase-field・転位-結晶塑性解析

SHIZAWA KAZUYUKI

M&M2023材料力学カンファレンス (筑波大学筑波キャンパス) ,

2023.09
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Oral presentation (general), 日本機械学会
Investigation on Optimal Microstructure of Dual Phase Steel with High Strength and Ductility by Machine Learning

Suzuki,M., Shizawa, K. and Muramatsu,M

XVII International Conference on Computational Plasticity (Complas 2023) (Barcelona, Spain.) ,

2023.09
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Oral presentation (general)
Dislocation-Crystal Plasticity Simulation for Investigation of Grain Size Dependency in Dual Phase Steel

Muramatsu,M, Suzuki,M. and Shizawa, K.

XVII International Conference on Computational Plasticity (Complas 2023) (Barcelona, Spain.) ,

2023.09
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Oral presentation (keynote)

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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

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2023.03

MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Principal investigator

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Awards 【 Display / hide 】

(一社)日本塑性加工学会フェロー

志澤一之, 2023.04, (一社)日本塑性加工学会

Type of Award： Award from Japanese society, conference, symposium, etc.
（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： Award from Japanese society, conference, symposium, etc.
（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： Award from Japanese society, conference, symposium, etc.
2019 Materials and Mechanics Division Achievements Award

Kazuyuki Shizawa, 2019.11, The Japan Society of Mechanical Engineers

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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

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Foe his Distinguished achievements in the field of computational mechanics