The significance of crack tip deformation for short and long fatigue cracks

被引：13
|
作者：
Hammouda, MMI [1 ]
ElSehily, BM [1 ]
DeLosRios, ER [1 ]
机构：
[1] UNIV SHEFFIELD,FAC ENGN,SIRIUS,SHEFFIELD,S YORKSHIRE,ENGLAND
来源：
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 1996年 / 19卷 / 04期
关键词：
short fatigue cracks; long fatigue cracks; finite element analysis; crack tip deformation; EN-9; steel;
D O I：
10.1111/j.1460-2695.1996.tb00983.x
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The behaviour of physical short mode I cracks under constant amplitude cyclic loading was investigated both numerically and experimentally. A dynamic two-dimensional elastic-plastic finite element technique was utilised to simulate cyclic crack tip plastic deformation. Different idealisations were investigated. Both stationary and artificially advanced long and short cracks were analysed. A parameter which characterises the plastically deformed crack tip zone, the strain held generated within that zone and the opening and closure of the crack tip were considered. The growth of physically short mode I cracks under constant amplitude fully reversed fatigue loading was investigated experimentally using conventional cast steel EN-9 specimens. Based on a numerical analysis, a crack tip deformation parameter was devised to correlate fatigue crack propagation rates.
引用
收藏
页码：475 / 484
页数：10
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