Abstract
In this study, the energy release rate derived previously and the method to determine the debonding length are applied to the cohesive force model that treats bridging fibers as a distribution of stresses to close the crack face. A numerical method to solve the cohesive force model of a penny-shaped crack is provided to determine the bridging stress, the debonding length, the crack opening displacement and the stress intensity factor. By introducing the fracture criteria of the composite and fiber, R-curves for the penny-shaped crack are simulated and the effects of such parameters as interface fracture toughness, compressive residual stress, frictional sliding stress, and fiber volume fraction on the R-curves are clarified. Based on the R-curve results, the toughening mechanism of FRC is discussed.
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