A further study on fatigue crack initiation life — mechanical model for fatigue crack initiation

Abstract In the present study, a new formula for the fatigue crack initation life is developed based on recent progress in the study of fatigue damage and crack initiation, and is substantiated experimentally. The new formula reveals a correlation between the fatigue crack initiation life, the notched element geometry, the cyclic loading condition, the tensile properties and the fatigue crack initiation threshold, which is indicated as an important parameter in describing the fatigue damage and crack initiation. The correlation between the fatigue crack initiation threshold, the endurance limit and the tensile properties is also given. The threshold for fatigue crack initiation can be obtained by the regression analysis of the fatigue crack initiation life test data without any additional test.