2019 Fiscal Year Final Research Report
High-temperature constitutive model for high-temperature press forming CAE
| Project/Area Number |
17K06056
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Hiroshima University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | アルミニウム合金 / 温間変形 / プレス成形 / 異方性 / 温度依存性 / ひずみ速度依存性 / 等塑性仕事面 |
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| Outline of Final Research Achievements |
High-temperature biaxial tension test apparatus was developed in this study. The heat device can heat the specimen up to 300 deg. Celsius with the errors of 1 deg. in the thickness direction and 5 deg. in plane. Additionally, x-axis of the device is displacement control while y-axis is load control based on the measured load of x-axis. This can achieve the simultaneous control of strain rate and stress ratio which is necessary for high temperature biaxial tension test.
Biaxial tension tests for A5182-O and A1050-O sheets were performed. As a results, it was found that equi-plastic work locus for A5182-O was able to express by von Mises yield criteria and the one for A1050-O was similar to the tresca criteria. For both material, the shape of plastic work loci were almost independent on temperature because these were annealed FCC materials. It was also found that the strain rate did not affect the shape of plastic work loci for both materials.
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| Free Research Field |
塑性力学
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| Academic Significance and Societal Importance of the Research Achievements |
これまでアルミニウム合金の温間二軸変形特性を調査した例はほとんどなく，本研究で得られた実験結果は金属の変形特性の一部を解明しており学術的に意義がある．また，温間での引張試験に求められる温度制御の許容値も明確にしており，今後の材料試験の標準化に対して指針を示すものである．また，本試験結果をもとに応力‐ひずみ構成則を構築することで単軸だけでなく多軸変形も高精度に記述できるようになるためプレス成形シミュレーションの計算精度向上が期待できる．これにより，プレス現場での金型設計や材料の加熱条件，冷却工程の設計などをコンピュータシミュレーションで実施でき，コストと開発時間の短縮が図れる．
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