Extremely low cycle fatigue life prediction based on a new cumulative fatigue damage model

In order to predict an extremely low cycle fatigue (ELCF) life for annealed low carbon steel of S20C, a new cumulative fatigue damage model has been proposed. The model was based on the concept that the damage due to ductility exhaustion should be considered besides the damage generated by crack propagation in the ELCF regime where excessive strain was applied. It was found that the predicted fatigue life coincided well with the experimental results obtained by conventional fatigue tests and fatigue tests under mean strain conditions.