Mixed-Mode Interfacial Debonding Simulation in Single-Fiber Composite under a Transverse Load

Due to the coupling between the opening and sliding modes of an interfacial crack between a fiber and matrix, measuring the individual values of the interfacial strengths, specifically the normal and shear strengths, is very difficult. A method based on comparison between experimental and numerical results is proposed and implemented for estimating the normal and shear strengths along such an interface. We numerically simulate mixed-mode interfacial debonding in a transverse tensile test for a single-fiber composite coupon. The interface is modeled using cohesive elements which are subjected to a quadratic failure criterion. Frictional effects are also included when the stress states are comprised of shear and compressive modes.