Abstract
A study has been made of the fatigue behaviour in repeated tension of unidirectional and [(±45, 0, 0)2]s hybrid laminates composed of XAS carbon fibres and E-glass fibres in the same 913 epoxy resin. The ordinary mechanical properties of these composites are close to those predicted by simple, conventional models of hybrid behaviour. For the unidirectional materials, the fatigue stress for a given life is not a linear function of composition, showing a substantial positive deviation from the rule of mixtures. This behaviour closely mirrors that of unidirectional carbon-Kevlar hybrids reported in Part 1 of this work. In terms of strain-life comparisons, results for all hybrid compositions and plain carbon fibre reinforced plastic fall within a single scatter-band. These features are also reflected in the fatigue behaviour of the more complex hybrid laminate.
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