Evaluation for Fatigue Crack Propagation of Sn-Sb alloy/Cu Joint using Inelastic Strain Energy Density

Abstract

A method to remove the effect of element size and distance from crack tip on inelastic strain energy density range near the crack tip was proposed, and the method was applied to evaluation for fatigue crack propagation of Sn-5Sb/Cu joint. The fatigue crack propagation rate obeyed a Paris type fatigue crack propagation law using the inelastic strain energy density. The continuous dynamic recrystallization occurred in the low strain energy region and the fatigue crack propagated at grain boundaries formed by the recrystallization. In the high strain energy region, the fatigue crack developed by cleavage, which resulted in large exponent of the fatigue crack propagation law.