The discrete nature of the growth and arrest of microstructurally short fatigue cracks modelled by dislocation technique

被引：6
作者：
Bjerkén, C [1 ]
机构：
[1] Lund Univ, Dept Engn Mech, Div Mat Engn, S-22100 Lund, Sweden
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2005年 / 27卷 / 01期
基金：
瑞典研究理事会;
关键词：
short crack growth; grain boundary; dislocation; crack arrest;
D O I：
10.1016/j.ijfatigue.2004.06.012
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Growth of a microstructurally short edge crack in the neighbourhood of a grain boundary has been studied using a dislocation technique. Influence of the distance between the crack tip and a high-angle grain boundary was studied for 5000 load cycles. Growth rate was found to change stepwise during crack advance, both accelerating and decelerating, and finally retarding before crack arrest. Crack propagation is ruled by the competition between the shielding effect from the dislocations in the plastic zone and the stress field increase due to crack extension, and clearly shows a discrete behaviour at growth below the fatigue threshold load. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：21 / 32
页数：12
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