Influence of the non-singular stress on the crack extension and fatigue life

被引：12
作者：
Cheng, C. Z. [1 ,2 ,3 ]
Recho, N. [2 ,3 ]
Niu, Z. R. [1 ]
机构：
[1] Hefei Univ Technol, Sch Civil Engn, Hefei 230009, Anhui, Peoples R China
[2] EPF Ecole Ingenieurs, ERMESS, F-92330 Sceaux, France
[3] Univ Blaise Pascal, F-63000 Clermont Ferrand, France
来源：
NUCLEAR ENGINEERING AND DESIGN | 2012年 / 248卷
基金：
中国国家自然科学基金;
关键词：
HIGHER-ORDER TERMS; T-STRESS; FRACTURE-MECHANICS; FIELD PARAMETERS; BRITTLE-FRACTURE; MODE-I; TIP; SINGULARITIES; CRITERION; EQUATIONS;
D O I：
10.1016/j.nucengdes.2012.03.017
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
The complete elasticity stress field at a crack tip region can be presented by the sum of the singular stress and several non-singular stress terms according to the Williams asymptotic expansion theory. The non-singular stress has a non-negligible influence on the prediction of the crack extension direction and crack growth rate under the fatigue loading. A novel method combining the boundary element method and the singularity characteristic analysis is proposed here to evaluate the complete stress field at a crack tip region. In this new method, any non-singular stress term in the Williams series expansion can be evaluated according to the computational accuracy requirement. Then, a modified Paris law is introduced to predict the crack propagation under the mixed-mode loading for exploring the influence of the non-singular stress on the fatigue life duration. By comparing with the existed experimental results, the predicted crack fatigue life when the non-singular stress is taken into consideration is more accurate than the predicted ones only considering the singular stress. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：293 / 300
页数：8
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