Crystal plasticity finite element modelling of low cycle fatigue in fcc metals

被引：36
作者：
Grilli, Nicolo [1 ,2 ]
Janssens, Koenraad G. F. [1 ]
Van Swygenhoven, Helena [2 ,3 ]
机构：
[1] Paul Scherrer Inst, Nucl Energy & Safety Dept, Lab Nucl Mat, CH-5232 Villigen, Switzerland
[2] Ecole Polytech Fed Lausanne, IMX, NXMM Lab, CH-1015 Lausanne, Switzerland
[3] Paul Scherrer Inst, NUM ASQ, Mat Sci & Simulat, CH-5232 Villigen, Switzerland
来源：
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS | 2015年 / 84卷
基金：
瑞士国家科学基金会;
关键词：
Dislocations; Crystal plasticity; Fatigue; Finite element method; CROSS-SLIP; DISLOCATION DYNAMICS; SCREW DISLOCATIONS; DEFORMATION; BEHAVIOR;
D O I：
10.1016/j.jmps.2015.08.007
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A new dislocation-based model for low cycle fatigue in fcc metals at a length scale smaller than the feature size of the dislocation structures is presented. It uses the crystal plasticity finite element method and dislocation densities as internal variables. Equations for the dipole distance distribution, for the double cross slip mechanism and a new dislocation multiplication law are introduced, which can predict the emergence of vein and channel structures starting from a randomly perturbed dislocation distribution. The characteristics of these structures in copper and aluminium, as well as the mechanical properties, are compared with experiments. Compared with existing density-based theories, the capability to reproduce dislocation patterning is a significant step forward. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：424 / 435
页数：12
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