Abstract
A complex kinetic model of damage development under cyclic loading is proposed to describe the process of fatigue failure. Two separate models are proposed. A numerical method for calculating crack-like zones up to macro fracture is proposed. The results of numerical fatigue experiments are presented. The operability of the single criterion model and calculation algorithm is shown on experimental results. The potential operability of the double criteria model was shown; the presence of two criteria that use different types of crack nucleation may result in cases when one of the criteria leads to crack growth while the other one does not and vice versa. Under a complex stress state in the proposed double criteria model the natural implementation of any of the considered crack development mechanisms is possible. Cracks of different types may be developing simultaneously in various parts of a specimen.
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