A study of the influence of grain boundaries on short crack growth during varying load using a dislocation technique

被引：30
作者：
Bjerkén, C
Melin, S
机构：
[1] Lund Univ, Dept Mech Engn, Div Mat Engn, S-22100 Lund, Sweden
[2] Lund Univ, Dept Mech Engn, Div Solid Mech, S-22100 Lund, Sweden
来源：
ENGINEERING FRACTURE MECHANICS | 2004年 / 71卷 / 15期
基金：
瑞典研究理事会;
关键词：
dislocation dipoles; discrete dislocations; short crack growth; grain boundary; dislocation nucleation;
D O I：
10.1016/j.engfracmech.2003.10.006
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The propagation of short cracks in the neighbourhood of grain boundaries have been investigated using a technique were the crack is modelled by distributed dislocation dipoles and the plastic deformation is represented by discrete dislocations. Discrete dislocations are emitted from the crack tip as the crack grows. Dislocations can also nucleate at the grain boundaries. The influence on crack growth characteristics of the distance between the initial crack tip and the grain boundary has been studied. It was found that crack growth rate is strongly correlated to the dislocation pile-ups at the grain boundaries. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2215 / 2227
页数：13
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