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Abstract
The fracture behaviours of carbon fibre reinforced plastic composites (CFRP) were investigated using specimens containing bundle fibres which were impregnated with polymers before being incorporated into an epoxy resin matrix. Of particular interest were the beneficial energy absorption mechanisms which are augmented by the bundle impregnation during fracture. Results showed that fibre bundling can improve transverse impact fracture toughness of the composite by approximately 100% as compared to the composite with uniformly distributed fibres for a given total fibre volume fraction, without any reduction in flexural strength. The fracture toughness correlated approximately with the frictional fibre pull-out work which was predicted based on the bundle strength and fibre pull-out length data.
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