A discrete dislocation dynamics study aiming at understanding fatigue crack initiation

被引：21

作者：

Brinckmann, S ^{[1
]}

Van der Giessen, E ^{[1
]}

机构：

[1] Univ Groningen, Dept Appl Phys, Micromech Grp, NL-9747 AG Groningen, Netherlands

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 387卷

关键词：

dislocation; fatigue initiation;

D O I：

10.1016/j.msea.2004.01.142

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We use discrete dislocation dynamics to build a model for fatigue crack initiation in a surface grain. Dislocations are modeled as line singularities in an elastic medium where they can be generated from pre-existing sources, glide or annihilate. The simulation reveals several features that can potentially give rise to fracture initiation. Three different potential areas of fracture-surface, grain interior and grain boundary-are found which correspond to those found in experiments. Comparison with experimental findings on crack nucleation is hampered by the computational expenses that limit the number of cycles that can be simulated. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：461 / 464

页数：4