A finite element analysis of stable crack growth in an aluminium alloy

被引：35
作者：
Cheung, S [1 ]
Luxmoore, AR [1 ]
机构：
[1] Univ Coll Swansea, Dept Civil Engn, Swansea SA2 8PP, W Glam, Wales
来源：
ENGINEERING FRACTURE MECHANICS | 2003年 / 70卷 / 09期
关键词：
aluminium; stable cracking; R-curve; J-integral; finite elements;
D O I：
10.1016/S0013-7944(02)00093-0
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Extensive stable cracking has been observed in large test pieces of 25 mm thick weldable AlMgZn alloy which is used in the construction of a portable bridge. Standard fracture specimens produced valid K-IC values, with short cracks exhibiting unstable fracture. Finite element analysis of the large specimens determined a valid J(R)-curve that can increase the effective K-C by several times the K-IC value. The R-curve has an unusual 'concave' shape that is associated with the change from initially flat fracture to fully slant fracture. The early stages of the R-curve are affected by in-plane constraint that can be indexed by the T-stress. The R-curve can be used to explain the stability of long cracks in full-scale tests on a bridge prototype, compared with the instability of short cracks in small, standard test pieces. (C) 2002 Elsevier Science Ltd. All rights reserved.
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收藏
页码：1153 / 1169
页数：17
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