材料科学
流动应力
本构方程
应变率
合金
软化
应变硬化指数
复合材料
硬化(计算)
变形(气象学)
延展性(地球科学)
铝
可塑性
冶金
热力学
有限元法
蠕动
物理
图层(电子)
作者
Wenjin Shen,Fengmei Xue,Chenzhen Li,Yi Liu,Xinyao Mo,Qingqing Gao
标识
DOI:10.1016/j.mtcomm.2023.106982
摘要
Uniaxial tensile tests are conducted on 6061 aluminum alloy sheets at different strain rates of a certain temperature and different temperatures of a certain strain rate. The true stress-strain curves show that the flow stresses are negatively correlated with strain rates and temperatures. Based on the Johnson Cook (J-C) constitutive model, the modified J-C model is constructed by replacing the strain term with a Voce hardening model and correcting the strain rate sensitivity coefficient and the thermal softening exponent. Compared with the J-C model, the modified J-C model has a smaller average absolute error and more accurately describes the plastic stress-strain relationship of 6061 aluminum alloy under various deformation conditions. Furthermore, the modified J-C model is also used for numerical simulation of uniaxial tension. The good agreement between the experimental and simulated load-displacement curves further verifies the usefulness of the modified J-C model. Finally, the microscopic mechanism by which deformation speeds affect ductility is analyzed by scanning electron microscopy (SEM).
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