Modeling the evolution of crystallographic dislocation density in crystal plasticity
Modeling the evolution of crystallographic dislocation density in crystal plasticity
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DOI：
10.1016/s0022-5096(01)00134-x
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发表时间：
2002-09-01
影响因子：
5.3
通讯作者：
Parks, DM
中科院分区：
文献类型：
--
作者：
Arsenlis, A;Parks, DM
位错是晶体塑性中最重要的材料缺陷，尽管位错力学一直被认为是连续晶体塑性公式的潜在物理基础，但在工作的本构模型中，晶体学位错力学在很大程度上缺乏明确的考虑。在这里，位错密度状态变量根据基于位错力学基本概念的方程从初始条件演化而来，如乘法和湮灭过程中的Burgers矢量守恒。应用该模型对单晶铝的聚性行为进行了研究。结果不仅捕获了机械应力/应变响应，而且还详细描述了负责塑性行为的潜在位错结构的发展。(C) 2002 Elsevier Science Ltd.版权所有。
Dislocations are the most important material defects in crystal plasticity, and although dislocation mechanics has long been understood as the underlying physical basis for continuum crystal plasticity formulations, explicit consideration of crystallographic dislocation mechanics has been largely absent in working constitutive models. Here, dislocation density state variables evolve from initial conditions according to equations based on fundamental concepts in dislocation mechanics such as the conservation of Burgers vector in multiplication and annihilation processes. The model is implemented to investigate the polyslip behavior of single-crystal aluminum. The results not only capture the mechanical stress/strain response, but also detail the development of underlying dislocation structure responsible for the plastic behavior. (C) 2002 Elsevier Science Ltd. All rights reserved.