Gear bending fatigue life prediction based on continuum damage mechanics and linear elastic fracture mechanics

In this study, a comprehensive finite-element-based method, utilizing the continuum damage mechanics (CDM) theory and the linear elastic fracture mechanics (LEFM) theory, is proposed to predict the total gear bending fatigue life including the crack initiation and propagation. The developed gear finite element model has been validated following the ISO standard result. The contribution of crack propagation to the overall lifetime is addressed. Simulated results indicate that the gear bending fatigue life, especially the crack initiation life, highly depends on the loading level. In addition, the gear bending fatigue crack initiation life dominates the total life.