Abstract
It is well known that fatigue failure of metallic materials takes place generally through two processes, crack initiation and its propagation. Therefore, their fatigue life can be divided to the crack initiation life and the crack propagation life. In particular, the crack propagation life takes a critical role for the final fatigue failure of structural members having defects such as sharp notches or fine cracks.In this paper, a statistical study was made on distribution characteristics of the fatigue crack propagation life of metallic materials, and, the results derived analytically were compared with the distribution characteristics of the experimental results. The results obtained are summarized as follows.(1) The parameter of crack propagation rule, C, has a logarithmic normal distribution, so that the crack propagation rate under any crack length is governed by the logarithmic normal distribution.(2) On the assumption that the parameter, m, is constant and C is random variable, the distribution function of fatigue crack propagation life can be analytically derived for any propagation length on the basis of the experimental results of the distribution of the parameter C.
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