Introduction of Strength Characteristics of Wire Rope

Release time:

2021-12-10

The strength of the wire rope is very important and is one of the main indicators to measure the quality of the wire rope. This paper introduces static strength and fatigue strength.

Introduction of Strength Characteristics of Wire Rope

The strength of the wire rope is very important and is a measurewire ropeOne of the main indicators of quality. This paper introduces static strength and fatigue strength.

1. static strength

1. Twisting coefficient η

The tensile breaking load (smaller breaking force) of the steel wire rope is inconsistent with the sum of the breaking force of all steel wires, and the former is generally low. We call the ratio of the actual smaller breaking force to the sum of the breaking forces of each steel wire as the twisting efficiency (twisting coefficient). The ratio of the difference between the actual smaller breaking force of the wire rope and the sum of the breaking force of the steel wire and the sum of the breaking force of the steel wire is called the twisting loss.

The factors that generally affect the loss of wire rope twisting are:

① Twist angle of strands and steel wires; the greater the twist angle, the greater the twisting loss.

The structure of the wire rope; the more complex the structure, the greater the twisting loss.

③ between the strands and the meshing effect between the steel wire; careful observation of the static tensile test fracture of the point contact wire rope, it can be found that most of them are broken in the part of the meshing caused by the indentation.

④ The uniformity of tension between each strand or between each steel wire; the more the number of steel wires, the larger the trend.

⑤ The uniformity of the mechanical properties of each steel wire; the steel wire rope made by mixing and twisting different steel wires with tensile strength, diameter or elongation at break is more likely to have problems. The tensile strength of the steel wire is high or the elongation at break is small, and the twisting loss tends to increase.

2. The relationship between strength and structure

① Strength of point contact wire rope and line contact wire rope

Point contact steel wire rope Since the lay angle of each layer of steel wire is equal, all steel wires except the central steel wire are subjected to the same tensile stress. However, since the lay lengths of the individual layers are different, all the wires are inevitably crossed and thus subjected to locally large lateral pressure (secondary bending). It is not found in the static tensile test, so the strength will be affected by the secondary bending and internal friction.

The wire contact wire rope because the inner layer of the wire lay angle is smaller than the outer layer, so the tensile stress is higher. Different steel wire layer steel wire diameter is different, the tensile stress is different.

By the same token, it can be considered that the strength of a flat strand wire rope or a surface contact wire rope will be higher. However, because it is more like a steel bar, the flexibility becomes poor; the profiled steel wire also has problems in the processing of the strength and toughness of the steel wire.

In addition, even the same diameter of the wire rope, due to the effective cross-sectional area is different, that is, the weight of the wire rope per unit length is different, the strength is also different.

③ Relationship between the number of steel wires and the strength of steel wire rope

The more the number of steel wires that make up the wire rope, the greater the twisting loss and the greater the twisting loss of the metal core. Therefore, the strength of the steel wire rope is smaller, but for one strand, the number of outer steel wires is larger, and the gap between the circumscribed circle of the strand section is smaller.

The relationship between steel wire strength and steel wire rope strength.

In general, the higher the strength of the steel wire, the greater the twist loss.

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