Abstract
The damage tolerance of a component is crucial for achieving a reliable and smooth operation. The crack propagation in a spur gear critically affects the performance of the transmission system. Asymmetric gears are used for enhancing the load-carrying capacity by increasing the pressure angle of a flank beyond the conventional limits. In this study, the effect of initial crack inclination angle and length in the tooth fillet region on the Stress Intensity Factor (SIF) and the crack path of an asymmetric gear (34°/20°) were studied using numerical simulations. Quasi-static analyses were performed in FRANC2D. The crack propagation life was calculated using Paris law. Results revealed that tooth asymmetry has no effect on the crack path. However, asymmetric tooth form caused a reduction in the SIF value and increased the critical crack length, leading to an increased crack propagation life and damage tolerance.
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