Abstract
A method to calculate the fatigue life under wide-band random loading is presented. Total lifetime is assumed to be the summation of nucleation and crack propagation lives. The nucleation life is determined through the local strain approach, using a linear cumulative damage criterion. The stress history is characterized by the probability density function (PDF) of the ranges obtained after applying the rainflow cycle counting method. A crack growth rate equation is applied for crack propagation. The approach is based on a statistical representation of the increase of crack length at any cycle as a function of the previous length and the PDF of stress ranges.
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