Hot-dip galvanized steel wire rope bending fatigue is caused by its running in the sky or opening and closing on a single-layer drum.
Fatigue cracks usually start at the points of contact between the outer wires and the sky or drum surface or at the intersections between the individual steels. Then the cracks continue to increase with the number of bendings, resulting in fractures perpendicular to the axial direction of the steel wire. Fatigue broken wires occur more often on the inside of the rope bend (at the point of contact with the sky) than on the outside of the bend (at the point of highest bending stress). The fatigue resistance of hot-dip galvanized steel wire ropes generally increases with the increase of the number of outer wires and the decrease of the diameter of the rope.
The durability of the wire rope can also be increased by increasing the sky or drum diameter 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 relubrication during use will reduce the friction between the rope elements and thus improve the fatigue resistance of the hot-dip galvanized wire rope.
Bending fatigue broken wire on a wire rope made of compacted outer strands. The distribution of bending fatigue broken wires is usually random. Wire rope bending fatigue broken wire
Severely worn wire rope with some fatigue broken wires The ends of the broken wires are displaced in different directions due to twisting of the wire rope.
This 6-strand wire rope showed little to no fraying, but a large number of fatigue broken wires.
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