An FFT-based crystal plasticity phase-field model for micromechanical fatigue cracking based on the stored energy density

A novel FFT-based phase-field fracture framework for modelling fatigue crack initiation and propagation at the microscale is presented. damage driving force defined based on stored energy dislocation density, relating with microstructural damage. The formulation numerically implemented using FFT methods to enable of sufficiently large, representative 3D regions. early stages cracking are simulated, predicting paths, growth rates sensitivity relevant features. Crack through crystallographic planes shown in single crystals, while analysis polycrystalline solids reveals transgranular growth.