Abstract
Nylon and polyester fibres find many uses which subject them to cyclic tensile loads. Under specific cyclic loading conditions these fibres can fail by a fatigue process, which can be identified from their fracture morphologies. Fatigue failure only occurs when the minimum cyclic load is below a threshold level. Fatigue failure can therefore be avoided by increasing the overall loading on the fibre. Fatigue crack initiation has been observed to be associated with small particles within the fibres which are added to aid the manufacturing process. Crack initiation becomes generalised throughout the fibres and failure morphologies more complex as the temperature increases.
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