Details of a Researcher - Shizawa, Kazuyuki

Shizawa, Kazuyuki

写真a

Affiliation: Faculty of Science and Technology (Mita)

Position: Professor Emeritus

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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 】

Mathisson-Papapetrou force on wedge disclinations

Yuan, C., Lei, X., Tsuchida S., Fujii, T., Shizawa, K.

Acta Mechanica Sinica (Springer Nature) 41 424637_1 - 424637_13 2025.01

Research paper (scientific journal), Joint Work, Last author, Accepted
- Access to Document (DOI)
- Access to Document (DOI)
Deep learning-aided inverse analysis framework to accelerate the exploration of DP steel microstructures

Suzuki M., Shizawa K., Muramatsu M.

Materials Today Communications 41 2024.12

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Materials development requires numerous numbers of trial and error experiments. To reduce the experimental cost, numerical simulations which predict material microstructures and mechanical properties have a great potential to estimate the microstructures that should be produced for obtaining materials with the desired properties. There is a need to develop dual-phase (DP) steel with higher strength and ductility because DP steel is widely used due to its significant mechanical properties. DP steel consists of a soft phase (ferrite) and a hard phase (martensite), and the mechanical properties depend on the ratio of the two phases. The mechanical properties of DP steels are affected by the spatial distribution of martensite and ferrite, which requires a comprehensive consideration of a variety of microstructures. The problem is how to estimate microstructures of DP steel with the desired mechanical property because a comprehensive investigation of microstructures makes computational cost significantly expensive. For the purpose of reduction of the computational costs, we aim to develop a framework with low computational cost. The developed framework finds the optimal microstructure of DP steel by repeated random searches for a model that combines a generative adversarial network (GAN), which generates microstructures, and a convolutional neural network (CNN), which predicts the maximum stress and working limit strain from microstructures. Due to a low-dimensional search space provided by a latent variable of GAN, the proposed framework enables an efficient search for microstructures possible. To explore the desired microstructures under complex deformation modes, the multiple deformation modes are considered in this study. This framework is applicable not only for the microstructure of DP steel but also any other material microstructures. We are exhaustively able to explore the microstructure with desired properties of metallic or other composite materials in low-dimensional space thanks to this framework and contributes to accelerating materials development.
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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, ISSN 05145163

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Dual-phase Mg alloys consisting of α-Mg phase and LPSO phase are attracting attention as structural materials of next-generation because of its high specific strength and relatively high ductility. These alloys have excellent mechanical properties attributed to kink deformation and grain refinement based on dynamic recrystallization. However, the influence of kink formation and difference in grain size on material strength of the alloys has never been clarified computationally. In this paper, a crystal plasticity Cosserat model is newly developed considering disclination density to take account of information of rotational crystal defect important for kink formation. Using the preset model, a two-dimensional FE analysis is performed for a rectangular three-crystal plate and a polycrystalline plate of the dual-phase Mg alloys with LPSO phase. Through such computation, the effects of shape of kink band and recrystallized grain size of α-Mg phase on change in material strength are numerically predicted in the process of reverse loading after compression one.
- Access to Document (DOI)
Current Status and Issues of Crystal Plasticity Model

Shizawa K.

Journal of the Japan Society for Technology of Plasticity 6 ( 61 ) 1 - 2 2023

ISSN 00381586
- Access to Document (DOI)
Multiphysics Crystal Plasticity Analysis

Shizawa K.

Journal of the Japan Society for Technology of Plasticity 6 ( 61 ) 9 - 12 2023

ISSN 00381586
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Papers, etc., Registered in KOARA 【 Display / hide 】

Disclination-based crystal plasticity model and mess-free analysis at large deformation for strengthening of LPSO/Mg alloys

Shizawa, Kazuyuki

科学研究費補助金研究成果報告書 2022
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
,
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
,
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
,
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
,
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