Abstract
This paper describes the development of an experimental rig to simulate the
bending-tension action of a rope cycling over a sheave with tension fluctuations in
phase with small bending length motions. Results are presented showing that
increasing bending motions and increasing tensile load range can both lead to
significant reductions in fatigue life. It is shown that at low bending lengths and low
load amplitudes, the endurance in tension-tension and bending-over-sheaves
fatigue modes, respectively, limit life. However despite the severe life reductions
imposed by bending fatigue, the damage tends to be restricted so that moving the
position of the rope can redistribute the fatigue damage thereby restoring longevity.
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