Causes of bending fatigue of hot dip galvanized steel wire rope

Bending fatigue of hot-dip galvanized steel wire rope is caused by its running in the sky or opening and closing on a single-layer drum.

Fatigue cracks usually start at the point of contact between the outer steel wire and the surface of the drum or at the intersection between the individual steels. Then the crack will break perpendicular to the axial direction of the steel wire with the continuous increase of bending times. Fatigue wire breakage occurs more frequently on the inner side of the wire rope bend (at the point of contact with the sky) than on the outer side of the bend (at the point of z-high bending stress). The fatigue resistance of hot-dip galvanized steel wire rope generally increases with the increase of the number of steel wires outside the rope and the decrease of the diameter.

The durability of the wire rope can also be increased by increasing the diameter of the hoist drum or by reducing the tension of the rope. Wear or corrosion may increase the rate of crack formation and crack propagation. However, good wire rope lubrication and re lubrication during use will reduce the friction between the wire rope elements, thereby improving the fatigue resistance of the hot-dip galvanized wire rope.

Bending fatigue broken wire on steel wire rope made of compacted outer layer strand. The distribution of bending fatigue broken wires is usually random. Bending fatigue broken wire of steel wire rope

The severely worn steel wire rope has some fatigue broken wires. Due to the twist of the steel wire rope, the ends of the broken wires move to different directions.

This 6-strand wire rope shows almost no wear and tear, but there are a lot of fatigue broken wires.