Abstract
Enhancement of fracture toughness increment by fiber bridging in fiber-reinforced composites was theoretically predicted in the case of small scale bridging conditions. This calculation was based on the stress field analysis of fiber pull-out which takes account of the interfacial bond, interfacial residual clamping stress and the Poisson's contraction of fibers induced by applied tensile loads. Fracture toughness tests of unidirectionally SiC fiber-reinforced glass composites were also performed. The fracture toughness increment observed in the experiment was in good agreement with the present theoretical prediction. The optimum interfacial properties to maximize the fracture toughness in steady-state as well as the relationship between the interfacial debonding behavior and fracture toughness were addressed.
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