Abstract
The Gaussian stationary stochastic load process is considered to cause fatigue crack growth in randomly inhomogeneous materials. The Paris-Erdogan model is applied and the time when the crack length reaches a critical value (lifetime) is determined as a random variable. It is shown that random variations of the lifetime are not significantly affected by stochastic fluctuations of loading and material inhomogeneity. These fluctuations, however, affect significantly the mean value of the lifetime. An example is carried out to show quantitatively the influence of the load and material randomness on the structural lifetime.
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