Modeling the large deformation and fracture of polymer-metal-polymer film composites – Part Ⅱ: Fracture behaviors

This study expands on the layered structure model established in part Ⅰ to predict the fracture behavior of polymer-metal-polymer film (PMPF). To capture the fracture behavior of PMPF, the all-boundary cohesive zone model (ABCZM) is adopted, which involves inserting cohesive elements between all continuum element boundaries in potential fracture areas. This allows for the evaluation of the damage behavior of components by FE simulation. To enable the ABCZM in shell assembly, a specific shell cohesive element is introduced. Fracture parameters are identified through the double-edge notched tension, and the fracture response of PMPF is predicted under circular notched tension with different radii. The convergence of the mesh size in ABCZM is discussed, and it is found that a similar fracture behavior of PMPF can be achieved by satisfying a specific relation between the mesh size and fracture parameters. Furthermore, the fracture behavior of the punch test of PMPF is investigated and analyzed through ABCZM, demonstrating its progressiveness in predicting potential cracking paths of PMPF in engineering scenarios.