Abstract
Warrington-Seal type wire ropes with independent wire rope core (IWRC), which are used as derricking and hoisting ropes in mobile cranes, are damaged by cyclic bending when a wire rope pass a sheave. The damage of a wire rope is evaluated not by load history but by the number of broken element wire on the surface of the wire rope. In this study, S type bending fatigue tests under the different wire rope tensions were carried out in order to investigate the effect of wire rope tension on fatigue damage in IWRC 6xWS(31) wire ropes. Also, the number of internal broken wire was evaluated when broken element wires were observed on the surface of the wire rope. As a result of S type bending fatigue test, fatigue lives of IWRC 6xWS(31) are varied in inversely proportion to wire rope tension. The number of internal broken wire at nip and bed positions increase proportion to wire rope tension.
