The variation in fatigue crack growth due to the thickness effect

被引：32
|
作者：
Kim, JK [1 ]
Shim, DS
机构：
[1] Hanyang Univ, Sch Mech Engn, Seoul 133791, South Korea
[2] Hanyang Univ, Dept Mech Design & Prod Engn, Seoul 133791, South Korea
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2000年 / 22卷 / 07期
关键词：
fatigue crack growth; variability; normal distribution function; random variable; lognormal model; thickness effect;
D O I：
10.1016/S0142-1123(00)00032-3
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
In this study, to investigate the statistical variability of crack growth rates, fatigue tests are conducted on 7075-T6 aluminum alloy specimens under constant amplitude load. Experimental results show that the da/dN-Delta K curve has a sigmoidal relationship, and the variation in crack growth rates increases with decreasing thickness. To describe the sigmoidal da/dN-Delta K relationship, the Forman equation is modified, and to consider the variability of crack growth rates, a variable Z is added to the modified Forman equation. Log Z, the residual of the modified Forman equation, is a normal random variable and is independent of crack length acid stress intensity factor range. In addition, the variance of log Z is the parameter that can estimate the variation in crack growth rates due to the thickness effect. Using the statistical properties and the quantitative estimation of log Z, crack growth process is simulated and the distribution of fatigue life is predicted. The results are compared to the prediction based on the Paris-Erdogan equation. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：611 / 618
页数：8
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