Determination of Cohesive Zone Model (CZM) and Numerical Analysis of Interface Fracture in Sintered Silver with Different Metallization Layers

This paper utilizes the cohesive zone model (CZM) and method of numerical computation to conduct inverse analysis, leveraging the existing experimental results of Single-Leg Bending(SLB) tests of sintered silver joints with different metallization layers. Based on experimental data, numerical inverse analysis was conducted to determine the cohesive zone model (CZM) parameters for sintered silver joints with varying metallization layers. Initially, curves of load and displacement (P-δ) are directly obtained from the SLB tests. Subsequently, by analyzing these experimental data, the interfacial fracture toughness of the sintered silver joints with different metallization layers is determined. A two-dimensional finite element model (FEM) for the three-point bending of an SLB sample is developed. Ultimately, the cohesive zone model of the sintered silver joints with different metallization layers is established. The research findings demonstrate that the interfacial fracture toughness is highest when the metallization layer is Ni/Ag. The results suggest that the numerical solutions are in good agreement with the experimental data.