Dynamic fiber debonding and frictional push-out in model composite systems: numerical simulations

Abstract

This paper summarizes our recent progress on the experimental and numerical study of dynamic fiber debonding and frictional push-out in model composite systems. A modified split Hopkinson pressure bar system is adopted to perform dynamic fiber push-out experiments. A cohesive/volumetric finite element scheme is developed to capture the initiation and propagation of the crack along the fiber/matrix interface. Interface properties are extracted by comparison between experimental and numerical results. Details of the physical process are analyzed by investigating numerically the propagation and evolution of the axial stress along the entire system. The numerical method is applied to an aluminum/epoxy model composite system. Finally, effects of several important parameters such as interfacial strength, interfacial fracture toughness, fiber/matrix friction coefficient and loading rate are investigated.