Published: 30 September 2007

Probabilistic fatigue reliability assessment

K. N. Nechval1
N. A. Nechval2
G. Berzinsand3
M. Purgailis4
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Abstract

The prediction of stochastic crack growth accumulation is important for the reliability analysis of structures as well as the scheduling of inspection and repair/replacement maintenance. Because the initial crack size, the stress, the material properties and other factors that may affect the fatigue crack growth are statistically distributed, the first-order second-moment technique is often adopted to calculate the fatigue reliability of industrial structures. In this paper, a second-order third-moment technique is presented and a three-parameter Weibull distribution is adopted to reflect the influences of skewness of the probability density function. The second-order third-moment technique that has more characteristics of those random variables that are concerned in reliability analysis is obviously more accurate than the traditional first-order second-moment technique

About this article

Received
15 May 2007
Accepted
03 June 2007
Published
30 September 2007
Keywords
Paris–Erdogan law
fatigue reliability
Weibull distribution