Crack Growth and Plastic,Fracture Process and Damage Zones Behavior Under Mixed Mode Loading

摘要

Fatigue crack paths for inclined cracks are studied through experiments and computations under different mixed-mode loading.The experimental study of fatigue crack growth in the aluminum and titanium alloys and two types of the steels is performed on compact tension shear specimens.The cyclic fracture process and damage zone concepts are introduced and used for numerical analysis of the crack tip fields.The elastic K1,K2 and plastic KP stress intensity factors are calculated by finite element method to characterize the fracture resistance along the curvilinear trajectories in compact tension shear specimens.The influence of mode-mixity and elastic-plastic material properties on the behavior of three crack tip regions as a function of cyclic loading is demonstrated.