A phenomenological plasticity model with non-normality effects representing observations in crystal plasticity
A phenomenological plasticity model with non-normality effects representing observations in crystal plasticity
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DOI：
10.1016/s0022-5096(00)00080-6
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发表时间：
2001-06-01
影响因子：
5.3
通讯作者：
Tvergaard, V
中科院分区：
文献类型：
--
作者：
Kuroda, M;Tvergaard, V
应变路径突变最近被用来确定当前加载点附近的后续屈服面的形状。多晶塑性计算和实验都表明塑性流动的非正态性，在表面光滑的屈服面上有顶点型响应。这种观察的物理原因仔细讨论的文件中，特别强调的事实是，尽管正常规则的晶体塑性模型的每个滑移系的预测出现。为了表示所观察到的非线性材料响应，提出了一种唯象塑性模型，其中各向异性固体的光滑屈服面与顶点型塑性流动规则相结合。由于塑性不稳定的结果是特别敏感的精确建模的材料响应下突然的应力路径变化，材料模型进行测试，在双向拉伸金属板颈缩的发病预测。II示出的唯象塑性模型给出了一个很好的近似的临界应变预测的泰勒多晶塑性模型的直接应用。(C)2001爱思唯尔科技有限公司版权所有。
An abrupt strain path change has recently been used to determine the shape of the subsequent yield surface near a current loading point. Both polycrystal plasticity calculations and experiments have shown non-normality of plastic flow, with a vertex-type response on the apparently smooth yield surface. The physical reason for this observation is carefully discussed in the paper, with particular emphasis on the fact that the prediction appears in spite of the normality rule built into each slip system of the crystal plasticity model. To represent the observed non-linear material response, a phenomenological plasticity model is proposed, in which a smooth yield surface for an anisotropic solid is combined with a vertex-type plastic flow rule. As plastic instability results are particularly sensitive to accurate modeling of material response under abrupt stress path change, the material model is tested on predictions of the onset of necking in biaxially stretched metal sheets. II is shown that the phenomenological plasticity model gives a good approximation of critical strains predicted by direct application of the Taylor polycrystal plasticity model. (C) 2001 Elsevier Science Ltd. All rights reserved.