Analytical fatigue life formulation for notches informed by crystal plasticity

Damage from small manufacturing defects often go unnoticed until fatigue cracks have grown beyond repairability. These initiate at with dimensions on par the microstructure length scale (e.g., 5–200 µm deep), which affects variability and renders most engineering prognosis methods inapplicable. This work develops a novel microstructure-sensitive formulation that reduces computational efforts by decoupling geometric microstructural contributions to cracking. Crystal plasticity finite element models without geometry induced strain gradients were considered assess role of independently microstructure. The analysis results in life analytical whose parameters depend defect morphology.