Simulation of Subsurface Crack Initiation at Original Austenite Grain Boundaries Under Rolling Contact Fatigue Using Crystal Plasticity and Cohesive Elements
Subsurface crack initiation is one of the primary damage modes for materials under rolling contact fatigue.A crystal plasticity model combined with the cohesive zone elements is used to simulate the subsurface fatigue crack initiation at original austenite grain boundaries in a high strength steel.Based on the cohesive zone model of damage initiation criterion and fatigue damage evolution law,the damage accumulation with the number of cycles was calculated utilizing the crystal plasticity model in conjunction with the USDFLD subroutine.The fatigue crack initiation in the Voronoi model is simulated,and the effect of the crystal orientation on the crack initiation is investigated.The results indicate that the crack initiation is dominated by the shear stress,and the initiation position is within the range of maximum shear stress.The simulation results are consistent with the experimental observations.The grain orientation has a significant impact on the crack initiation location.
万方数据
维普
