This paper reports on the results of an investigation into the mechanical property behaviour and fatigue performance of polyester rope. Dynamic modulus under different mean loads and strain amplitudes has been examined from ropes in the asnew to fully-worked conditions of 200 000 and 2 million cycles. Under sinusoidal and stochastic loading conditions, both mean load and strain amplitude is shown to affect modulus. Equations allowing these variables to be quantified are presented. During high cycle fatigue testing, for a given mean load/load range combination, modulus has been shown (after bedding-in) to remain effectively constant. Resulting from this investigation into long-term property behaviour, possibly the most comprehensive fatigue test programme ever to be performed on a batch of polyester rope has been produced. A T-N fatigue line based on these results is presented.
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