A novel defect-based fatigue damage model coupled with an optimized neural network for high-cycle fatigue analysis of casting alloys with surface defect

A novel defect-based fatigue damage model coupled with an optimized neural network is proposed for high-cycle fatigue prediction. Based on parametric studies and continuum damage mechanics, the defect-based fatigue damage evolution equation is derived, and the numerical simulation and fatigue damage computation are then implemented and validated. After that, more computations are performed to acquire a batch of reliable fatigue data, and the database is obtained. Finally, the architecture of the optimized neural network is established, and the predicted results are verified by experimental fatigue data. The proposed methodology works well for the fatigue analysis of casting alloys with surface defect.