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タイトル: | Evolution of plastic deformation behavior upon strain-path changes in an A6022-T4 Al alloy sheet |
著者: | Hama, Takayuki https://orcid.org/0000-0002-6464-9947 (unconfirmed) Yagi, Shogo Tatsukawa, Koji Maeda, Yasuhiro Maeda, Yasushi Takuda, Hirohiko |
著者名の別形: | 濵, 孝之 宅田, 裕彦 |
キーワード: | Al alloy sheet Crystal plasticity finite-element method Biaxial tension Strain-path change Plastic flow Strain rate sensitivity |
発行日: | Feb-2021 |
出版者: | Elsevier BV |
誌名: | International Journal of Plasticity |
巻: | 137 |
論文番号: | 102913 |
抄録: | The plastic deformation behavior under various strain-path changes in an A6022-T4 Al alloy sheet was studied, focusing on the evolution of the direction of the plastic strain rate θ and the stress ratio φ after abrupt strain-path changes. A cruciform specimen was used to measure the evolution of the plastic deformation behavior after abrupt strain-path change experimentally. Before the strain-path change, the deformation was represented well by the associated flow rule with the Yld2000-2d yield function and isotropic hardening assumption. After the abrupt-path change, the deformation temporarily deviated from the associated flow rule, and it could be represented again by the associated flow rule after the plastic work increased roughly 4.0 MJ⋅m−3, which corresponded to the strain increment of approximately 0.024 under uniaxial tension in the rolling direction. The transitions of θ and φ as a function of plastic work showed that both θ and φ tend to converge to certain values regardless of the strain path if the final strain-path angles are identical. It was also found that the relationships between φ and θ temporarily deviate from the associated flow rule immediately after the abrupt-path changes because φ cannot follow the rapid change of θ. Crystal plasticity finite-element simulations reproduced the qualitative tendencies observed in the experiments, but the deviations from the associated flow rule were much more pronounced. Parametric studies showed that φ tends to converge to different values depending on the strain rate sensitivity, whereas θ tends to converge to a same value irrespective of the rate sensitivity exponent. The rate sensitivity exponent m = 0.044 gave the best fits with the experimental results in terms of the evolution of both θ and φ under an abrupt-change path, although the rate sensitivity exponent determined from macroscopic strass-strain curves were m = 0.002. |
著作権等: | © 2021. This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 license The full-text file will be made open to the public on 1 February 2023 in accordance with publisher's 'Terms and Conditions for Self-Archiving' This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/265266 |
DOI(出版社版): | 10.1016/j.ijplas.2020.102913 |
出現コレクション: | 学術雑誌掲載論文等 |
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