Analysis and Numerical Simulation of Fatigue Propagation in Crack Front

In order to study the change rule of crack front edge morphology during fatigue crack propagation, the fracture toughness test of aluminum alloy was designed according to the test standard to obtain fatigue Crack front morphology; The distribution of stress intensity factor (SIF) at the crack front edge was studied by finite element simulation. The results show: penetration In the process of fatigue propagation, the front edge of the crack will evolve from the initial straight crack to the elliptic front crack.