Finite Element Simulation of Mixed-Mode PV Encapsulant Delamination Based on Cohesive Zone Model: Preprint

A finite element model (FEM) was developed to simulate the mixed-mode delamination failure at the encapsulant interface within PV modules under mixed-mode loading condi- tions. Parameters to characterize the bilinear traction-separation constitutive behavior of cohesive elements were determined by testing the pure mode I critical fracture energy of the photovotaic(PV) cell interface using the width-tapered beam and fitting the simulated load-displacement curve with the tested curve. This developed FEM can be used to predict the critical temperature changes, at which delamination would initiate, of PV modules with different sizes and provide guidance for the design of PV module with better reliability.