Abstract
Analytical expressions are presented which predict the debonding and pull-out lengths observed in brittle-fibre composites. The characteristic lengths are combined with models of four toughening mechanisms to calculate the work of fracture of a composite. The results are presented as maps showing not only contours of toughness but also the dominant toughening micromechanism. The toughness is largely determined by six material parameters, and each map demonstrates the combined effect of changing two of these simultaneously. Maps are presented for glass fibres in epoxy and carbon fibres in epoxy. Their use is demonstrated by showing the effects of hygrothermal aging on the toughness of the composites.
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