The influence of single and multiple overloads on fatigue crack propagation

被引：44
作者：
Lang, M [1 ]
Marci, G
机构：
[1] USAF, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA
[2] DLR, German Aerosp Ctr, Inst Mat Res, D-51147 Cologne, Germany
来源：
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 1999年 / 22卷 / 04期
关键词：
fatigue crack propagation; retardation; load interaction; overload; residual stress; crack closure; Delta K-eff concept; aluminium alloy;
D O I：
10.1046/j.1460-2695.1999.00165.x
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The effects of single and multiple overloads on fatigue crack propagation were studied experimentally using the aluminium alloy Al 7475-T7351. The crack propagation stress intensity factor, K-PR, was determined after each single and multiple overload sequence. The variation of K-PR With the overload parameters can be described by an empirical relationship that unifies the experimental data obtained under a variety of loading conditions. Observations made in the study suggest that load interaction effects are controlled by residual compressive stresses ahead of the crack tip, with fatigue crack closure playing only a secondary role.
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收藏
页码：257 / 271
页数：15
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