Comparison of Spectral Methods for Fatigue Analysis in Non-gaussian Random Processes – Application to Elastic-plastic Behaviour

In this paper, we present techniques for fatigue damage evaluation using spectral methods and a model taking into account elastic-plastic behaviour. The model is associated with a nonlinear fatigue law, covering the whole endurance domain (low cycle and high cycle fatigue). It uses Neuber's rule and is valid for limited plasticity. To validate this modelling, we perform a correlation between classic spectral methods, modified spectral methods and Monte Carlo simulations in time domain. Results obtained in the case of a numerical design plan are presented.