关键词: 裂纹扩展, 参数估计, 可靠性, 概率断裂力学

Abstract: The fatigue crack growth lognormal random process model based on time and the model based on crack length are usually used in the reliability and damage tolerance analysis. These models are identical under special conditions. Based on these models, a new method of evaluating the auto correlative parameter in the usual stationary normal random process by the experimental data is established. Using this method, the value of the correlative parameter can be evaluated directly on the basis of the experimental data. At the same time, the confidence interval of the parameters is obtained by using Monte Carlo method. At the end, a numerical example is given. In this example, four groups of experimental data of the specimens with fastening holes under pseudorandom spectrum loading, those obtained from 93 specimens, are used to determine correlative parameters.

Key words: crack p ropagat ion, parameter est imat ions, reliability, p robability fracture mechanics