BENDING FATIGUE BEHAVIORS OF A GALVANIZED STEEL STRANDED WIRE UNDER THE PRACTICAL CONDITIONS

초록

This paper describes the bending fatigue characteristics and fracture mechanisms of the galvanized steel stranded wire, used as a messenger wire undergoing on the tension at the supporting point in electric railway. The steel stranded wire is made by KS D 3559 and consists of simple stranded 1×7 wire cables. The test rig was developed in order to perform the bending fatigue tests considering the practical condition of metro line. We have investigated the bending fatigue behaviors by experimental approach. The failure mechanisms of individual wires were also analyzed. Fractography using SEM revealed the crack initiation at the location of abrasive wear between the single wire and clip holder.