Abstract
Two ways of the phenomenological modelling of fatigue crack growth have been developed in the past — deterministic crack growth laws and stochastic crack growth models. At present time the synthetizing models are constituted. The object of this paper is a model describing the variability of the crack growth process under constant-cycle loading as the consequence of heterogeneous material structure. A general stochastic model with discrete time and continuous state serves as the theoretical basis. Three types of process-variability are denned and theoretically solved. Concrete form of the model in the case of power-form growth laws is presented with regard to the evaluation of experimental data and to the crack growth predictions. The model is applied to evaluate the results of crack growth experiment on the specimen from aluminium alloy.
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