A model of anisotropy evolution of sheet metals
A model of anisotropy evolution of sheet metals
复制标题
金属板材各向异性演化模型
DOI：
10.1016/j.proeng.2014.10.100
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Takeshi Uemori
中科院分区：
文献类型：
--
作者：
Fusahito Yoshida;Hiroshi Hamasaki;Takeshi Uemori
传统塑性模型假设屈服面的形状在整个塑性变形过程中保持固定。然而，一些实验表明，各向异性随塑性应变的增加而变化。本文提出了一种描述板料应力方向和应力值各向异性演化的本构模型。各向异性的演化表现为屈服函数随有效塑性应变的变化。通过AA6022-T43铝板的实验数据验证了各向异性模型（继Stoughton， T. B. and Yoon， J. W., intj Plasticity 25(2009) 1777-1817）。该模型被纳入吉田-上森运动硬化模型，以描述鲍辛格效应和各向异性演化。
Conventional plasticity models assume that shapes of yield surfaces are remain fixed throughout plastic deformation. However, some experiments show that anisotropy is changing with increasing plastic strain. This paper proposes a constitutive model that describes the evolution of anisotropy, both for the stress directionality andr-values, of sheet metals. The evolution of anisotropy is expressed by the change of the yield function as a function of the effective plastic strain. The anisotropy model is validated by comparing the experimental data on AA6022-T43 aluminium sheet (after Stoughton, T. B. and Yoon, J. W., Int J Plasticity 25 (2009) 1777-1817). This model is incorporated into the Yoshida-Uemori kinematic hardening model to describe both the Bauschinger effect and the anisotropy evolution.