Abstract
In this paper the numerical method for prediction of fatigue life of structure is presented. The finite element modelling and damage parameter calculation are based on the algorithm described originally by Chaboche (1987), Luccioni et al. (1996) and Oller et al. (2005). This algorithm is simplified, i.e. the Goodman relationships between the mean and stress amplitude are included. It is extended and applied for simulation of crack propagation in the rotor shaft. The material constitutive model includes plastic effects and damage. The S–N fatigue functions taken from experiment are modified so as to be dependent on the real ratio between minimum and maximum stress in the critical zones. So the coupling between damage, plasticity and fatigue is taken into account.