Modeling of mixed-mode debonding in the peel test applied to superficial reinforcements

This paper focuses on modeling of the interface between a rigid substrate and a thin elastic adherend subjected to mixed-mode loading in the peel test configuration. The problem is approached both analytically and numerically. The analytical model is based on linear-elastic fracture mechanics. In the numerical model, the interface is modeled with contact elements which take into account both debonding and contact using the node-to-segment contact strategy. Uncoupled cohesive interface laws are adopted in the normal and tangential directions. The models are able to predict the response of the bonded joint as a function of the main parameters. The main objective is to compute the debonding load and the effective bond length of the adherend as functions of the peel angle.