Delamination Fracture Analysis Using Novel Joint Deformation Models

摘要

In this paper, three joint deformation models (i.e., the rigid, semi-rigid and flexible joint models) which describe the different degrees of crack tip deformation are presented, and the general solutions for compliance and energy release rate (ERR) of beam-type specimens are provided. Due to different considerations of the interface displacement compatibility in each bi-layer beam theory, these joint models show three distinct levels of accuracy in predicting the crack tip deformation. As a validation, an asymmetric DCB specimen is examined by the three joint models as well as the numerical finite element analysis, and three distinct accuracy levels of the solutions are revealed. The novel semi-rigid and flexible joint deformation models recently developed by the authors provide explicit closed-form solutions of fracture parameters which can be easily adopted in practice.