A Fracture Mechanics Approach to Failure in Fibrous Composites

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Abstract
This paper presents a review of the fracture processes which occur in brittle thermosetting resins containing long strong fibers of carbon, boron and glass. Important material variables affecting the fracture behavior of the fibrous composite include fiber strength and strength of the fiber-matrix interface. Other parameters which must be considered include component geometry, environment, loading mode and nondestructive inspection capability. The effects of microstructural features including fiber volume fraction, together with a consideration of the fiber-resin interface are discussed in relation to the fracture stress and toughness of the composite material. The influence of the fiber-resin interface and environment on slow crack growth in carbon fiber-reinforced epoxy resin is also reviewed.

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