Crystal-plasticity modeling of time-dependent deformation behavior of metallic sheets and its application to press forming simulations
| Project/Area Number |
17H03428
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/Microstructural control engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
Hama Takayuki 京都大学, エネルギー科学研究科, 准教授 (10386633)
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| Co-Investigator(Kenkyū-buntansha) |
高村 正人 国立研究開発法人理化学研究所, 光量子工学研究センター, 上級研究員 (00525595)
宅田 裕彦 京都大学, エネルギー科学研究科, 教授 (20135528)
袴田 昌高 京都大学, エネルギー科学研究科, 准教授 (30462849)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2018: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2017: ¥12,350,000 (Direct Cost: ¥9,500,000、Indirect Cost: ¥2,850,000)
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| Keywords | 結晶塑性有限要素法 / 時間依存変形 / 板材成形 / 環境調和型金属 / 環境調和型加工 / 加工硬化挙動 / 結晶塑性解析 / プレス成形 |
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| Outline of Final Research Achievements |
The purpose of this study was to comprehensively study time-dependent deformation behavior of metallic sheets and to model the behavior by using crystal-plasticity models. Specifically, first, a crystal plasticity model was developed to reproduce stress relaxation and creep behavior of commercially-pure titanium sheets. The developed model was then used to simulate the effect of time-dependent deformation behavior on the press formability of commercially-pure titanium sheets. Time-dependent deformation, where the shape of a press-formed part gradually changed after press forming, was well reproduced by using the developed model, and moreover, the underlying deformation mechanism of this behavior was also discussed. It is expected that the achievements of this work would be useful to extend use of environmentally-friendly metals, including titanium sheets, which would eventually lead to weight reduction of vehicles.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では，輸送機器の軽量化を促進しうる材料として期待されている環境調和型金属板の時間依存変形特性を系統的に調査し，またその理論モデルを構築した点が大きな学術的意義の一つである．具体的には，工業用純チタン板を対象として時間依存変形を予測可能な結晶塑性解析技術を開発し，またそれをプレス成形解析にまで応用したことは世界的にも初めての学術的成果である．本研究の成果を通して，環境調和型金属のプレス成形性向上とそれによるこれら金属の利用拡大，またその結果として輸送機器軽量化による地球環境問題への貢献が期待され，社会的にも大きな意義を持つ．
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Report
(4 results)
Research Products
(61 results)
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[Journal Article] Twinning and detwinning behaviors of commercially pure titanium sheets2019
Author(s)
Ma, C., Wang, H., Hama, T., Guo, X., Mao, X., Wang, J., and Wu, P.
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Journal Title
International Journal of Plasticity
Volume: 121
Pages: 261-279
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Determination Approach of Dislocation Density and Crystallite Size Using a Convolutional Multiple Whole Profile Software2018
Author(s)
Murasawa, K., Takamura, M., Kumagai, M., Ikeda, Y., Suzuki, H., Otake, Y., Hama, T., and Suzuki, S.
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Journal Title
MATERIALS TRANSACTIONS
Volume: 59
Issue: 7
Pages: 1135-1141
DOI
NAID
ISSN
1345-9678, 1347-5320
Year and Date
2018-07-01
Related Report
Peer Reviewed
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[Journal Article] Influence of Strain Ratio on Surface Roughening in Biaxial Stretching of IF Steel Sheets2018
Author(s)
Kubo, M., Hama, T., Tsunemi, Y., Nakazawa, Y., and Takuda, H.
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Journal Title
ISIJ International
Volume: 58
Issue: 4
Pages: 704-713
DOI
NAID
ISSN
0915-1559, 1347-5460
Related Report
Peer Reviewed
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[Journal Article] Convergence behavior in line profile analysis using convolutional multiple whole-profile software2018
Author(s)
Kumagai, M., Uchida, T., Murasawa, K., Takamura, M., Ikeda, Y., Suzuki, H., Otake, Y., Hama, T., and Suzuki, S.
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Journal Title
Materials Research Proceedings
Volume: 6
Pages: 57-62
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Investigation on stress relaxation behavior of high-strength steel sheets based on elasto-viscoplasticity2018
Author(s)
Takamura, M., Murasawa, K., Kusuda, Y., Suzuki, Y., Hakoyama, T., Ikeda, Y., Otake, Y., Hama, T., and Suzuki, S.
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Journal Title
Journal of Physics: Conf. Series
Volume: 1063
Related Report
Peer Reviewed / Open Access
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[Journal Article] Crystal Plasticity Finite-element Simulation on Development of Dislocation Structures in BCC Ferritic Single Crystals2017
Author(s)
Hama, T., Kojima, K., Kubo, M., Fujimoto, H., and Takuda, H.
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Journal Title
ISIJ International
Volume: 57
Issue: 5
Pages: 866-874
DOI
NAID
ISSN
0915-1559, 1347-5460
Related Report
Peer Reviewed / Open Access
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[Presentation] Investigation on stress relaxation behavior of high-strength steel sheets based on elasto-viscoplasticity2018
Author(s)
Takamura, M., Murasawa, K., Kusuda, Y., Suzuki, Y., Hakoyama, T., Ikeda, Y., Otake, Y., Hama, T., and Suzuki, S.
Organizer
NUMISHEET 2018
Related Report
Int'l Joint Research
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