Abstract
An approximated analytical solution relating to the stress-strain-state (SSS) near the crack tip at cyclic mixed loading was obtained. Analysis of conditions for damage accumulation in a material for gradient stress and strain fields was performed. A fatigue crack propagation model was developed on the basis of the local stress-strain criterion of fatigue failure formulated in a preceding paper (Part 1) and the analytical solution of the problem of the stress-strain-state near the crack tip. It was shown as applied to nuclear pressure vessel steel 2CrMoNiV that the proposed model allows one to predict the fatigue crack growth rate at any loading asymmetry and arbitrary ratio of stress intensity factors of I and II modes. Moreover, the model gives an adequate prediction for the beginning of the spasmodic growth of a fatigue crack.
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