When a wire rope is bent over a drum, the initial curvature and other geometrical characteristics imposed on the rope during the manufacturing operations, change, and these changes are dependent not only on the radius of the drum, but also on the actual position of the wire in the rope, and on the element of wire considered. These changes in the geometry involve the introduction of stresses in the wires of the rope that must be added to those imposed by the load. And, because the wires are helically laid into the rope, as has been seen previously, these stresses are characterised by the same parameters as the geometrical characteristics: amplitude and frequency, flection and torsional stresses.
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