期刊
ENGINEERING FRACTURE MECHANICS
卷 142, 期 -, 页码 21-49出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2015.05.027
关键词
Gamma process; Stochastic fatigue crack growth; Lifetime prediction; R-ratio effect; Reliability
类别
In this paper, the time to reach any given crack size in fatigue testing is directly modeled as a stochastic process. In particular, a gamma process with non-stationary independent increments is assumed for each specimen, where the shape parameter is a suitable function of the crack length. Then, the variability across specimens is accounted for by assuming that the scale parameter is a gamma random variable, resulting in simple mathematical forms for the distribution of service time, its mean and variance. The correlation between the Paris law parameters C and m is also revisited and some useful results are given. (C) 2015 Elsevier Ltd. All rights reserved.
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