2022 Fiscal Year Final Research Report
Study on Flow Rule of Thin Steel Sheet for Advanced Press Forming Simulation
| Project/Area Number |
20K15061
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 26050:Material processing and microstructure control-related
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| Research Institution | Gifu University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 金属薄板 / 降伏応力 / SD効果 / 円板圧縮 / 異方性 |
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| Outline of Final Research Achievements |
In order to improve the accuracy of sheet forming simulation, deformation behavior of a mild steel sheet and high tensile steel sheet was investigated. Uniaxial tensile tests were conducted to measure the deformation behavior of a mild steel sheet at various deformation rates (strain rates). The effect of strain rate on the deformation behavior was also investigated. A testing apparatus was fabricated to enable uniaxial compression test of thin metal sheets. Uniaxial tensile and compression tests were conducted for a high-strength steel sheet. The difference in yield stress between tension and compression was evaluated. The directional dependence (anisotropy) was also investigated by changing the loading direction. Plate compression simulations were performed to clarify the effect of the material deformation model on the plate compression simulations.
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| Free Research Field |
塑性加工学
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| Academic Significance and Societal Importance of the Research Achievements |
自動車を始めとして工業製品の部品の多くはプレス加工によって製造されている．プレス加工のシミュレーション精度向上によるプレス加工現場のトライアンドエラーレス生産実現は重要な課題である．本研究で得られた軟鋼板や高張力鋼板の変形挙動に関する知見はシミュレーション精度向上に繋がることから，工業的に意義がある．
材料の変形挙動に関する研究は降伏関数（力の異方性）やその発展を示す硬化則と呼ばれるものについて，これまで数多くの研究がなされている．一方で，力の異方性と変形の異方性をつなぎ合わせる流動則の研究は未だ不十分であり，本研究はその点を中心に変形速度や変形モードの影響などを明らかにした．
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