A constant-life model of fatigue that has previously been used successfully to describe the fatigue response of several common carbon-fibre-reinforced epoxy laminates has been further developed. In this paper, the validity of the model for use with a glass-velocity impact on the fatigue behaviour of both GRP and CFRP can be accounted for by means of the same model. It appears that if a suitable technique is available for predicting the compression strength of a laminate that has sustained damage from a low-velocity impact event, then the fatigue response of the damaged laminate can also be predicted with a reasonable degree of confidence without the need for extensive fatigue testing in the first instance.
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