2018 Volume 2018 Pages 20180011
The mechanism of sharp drop phenomenon of peel force on the standard peel test of multilayer films is elucidate using finite element (FE) analysis. In the ordinary peel tests of multilayer films bonded with adhesives, it is well known that the peel force depends on the peel velocity and sharply drops in the higher velocity range. First, we propose an effective two-dimensional FE modeling method to reproduce the phenomenon. Taking a two-layer film as an example, one of the films, the other film, and the adhesive connecting the two films are modeled as an elastic, elastoplastic, and viscoelastic body, respectively. The peeling interface is modeled by the cohesive zone model (CZM) to consider the damage on the interface with cohesive elements. The dynamic implicit scheme based on the backward Euler method is adopted to stabilize the highly nonlinear analysis with damage and large deformation. Second, we give an interpretation of the phenomenon based on the proposed FE results. The mechanism is elucidated from the two different points of view: stress distribution and energy consumption. It is also revealed that the peel force is negatively correlated with the film curvature radius.
