On the modelling of peeling growth using damage models between elasto-viscoplastic film and elastic substrate

Abstract

In recent years, there is an increasing trend of use the cohesive zone model (CZM) procedure in peeling test computing the separation energy between the film and the substrate. In this paper, an original technique expressed a failed zone method (FZM) is developed in order to determine in peeling model the progressive failure path in two materials interface. This approach is based on accumulated plastic strain computation leading to a full damage at the root of debonded interface between ductile film and rigid substrate. This damaged zone procedure is numerically conducted by finite element method program based on the release of fully damaged node to separate the connected elements creating a cracking path. In this analysis, a nonlinear damage evolution law is proposed in comparison with Lemaitre and Goijaerts locally accumulated damage models taking into account the materials properties, substrate elastic behaviour and film elasto-viscoplastic constitutive law. In one hand, the proposed damage model is in good agreement with both models and in the other hand this approach reflects perfectly step-by-step the peel growth of ductile film from rigid matrix.