Abstract
The behaviour of two types of polyester fibres have been compared and the differences observed explained in terms of the differences in molecular structure. One fibre which had a higher crystallinity than the other showed improved creep behaviour however shorter fatigue lifetime. Crack propagation during fatigue suggests a macrofibrillar structure superimposed on the microfibrillar molecular arrangement. Fatigue lifetime is suggested as being greatly influenced by the time necessary for crack initiation which involves modification of the molecular structure. The influence of the minimum cyclic load on fatigue lifetime has been studied for both fibres.
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