The role of interfaces in fiber-reinforced brittle matrix composites

Abstract

The dominant influence of fiber coatings on the mechanical performance of brittle matrix composites is addressed. These effects are described in terms of two independent mechanical parameters, the debond energy, Γ i , and the sliding resistance along the debond, τ. Complications associated with mode mixity, roughness and coating microstructure are emphasized. A mechanics of composite behavior based on these parameters is described, together with measurement approaches that allow Γ i and τ to be evaluated either in situ or in model composites. Key problems associated with fiber coatings are identified and discussed.