Role of the Matrix and Interface

As with particulate fillers, then, the fracture energy of a fiber-reinforced composite is a complex function of the properties of the reinforcement, the matrix, and the interface (Broutman, 1974 Cooper, 1974). Several modes 

Pulling of broken filaments out of the matrix following fracture (Kelly, 1966). 

Redistribution of strain energy from a fiber to the matrix after fracture of the fiber (Piggott, 1970). 

Type of work Symbol Origin Form of energy dissipation 

Fiber internal work yfb Fiber brittle fracture Stored elastic energy 

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