Three-dimensional surface cracks are a common defect in many engineering structures.Whether in damage tolerance design or defect assessment stages,accurate estimation of stress intensity factors for cracks is required.This parameter plays a crucial role in predicting cracks and estimating the remaining fatigue life.Utilizing the finite element software Abaqus and the fracture mechanics software Franc 3d,a three-dimensional semi-elliptical surface crack solid model was established.Based on fracture mechanics knowledge and using the M-integral method,numerical simulations were performed on models with surface cracks.The study investigated crack propagation and sensitivity of stress intensity factor parameters under different crack shape ratios(a/b=1.5,1.36,1.25,and 1.15)and crack inclinations(θ=0°,15°,30°,and 45°).The main research content and conclusions are as follows:The larger the crack shape ratio a/b,the smaller the stress intensity factor,and the distribution morphology of the stress intensity factor changes from"concave"to"convex".When the crack inclination reaches 0°,the stress intensity factor is maximal at the crack's depth,making the crack more prone to propagation.As the crack inclination(0°,15°,30°,and 45°)increases,the stress intensity factor gradually decreases.
three-dimensional surface crackstress intensity factorparameter sensitivityfracture mechanicsfinite element analysis
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