How to calculate the force of cutting steel wire

F0 = k '* D2 * R0 / 1000

where

F0 is the minimum breaking force of wire rope, in kn

d nominal diameter of wire rope, in mm

R0 nominal tensile strength of wire rope, unit: MPa

k 'the minimum breaking force coefficient of a certain type of wire rope

in the conventional engineering construction, the most commonly used is 6 × 19 and 6 × Steel wire rope of 37 structure. six × 19 is relatively hard and the monofilament is relatively thick. It is generally used as wave wind rope and stay wire; six × 37 is relatively soft, and the monofilament is relatively thin. It is generally used for grinding rope and hoist rope, and needs to pass through the parts with large bending angle of pulley

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extended data:

steel wire rope is a standard proct in various instrial countries. Its diameter, number of strands, number of steel wires per share, tensile strength and sufficient safety factor can be selected according to the needs of application. Its specifications and models can be found in relevant manuals

in addition to the wear of the outer steel wire, the steel wire rope is graally broken e to metal fatigue caused by repeated bending when bypassing the pulley and drum. Therefore, the ratio of pulley or drum to the diameter of the steel wire rope is an important factor determining the service life of the steel wire rope. The ratio is large, the bending stress of steel wire is small, the service life is long, but the mechanism is huge

the steel wire rope is mainly used in the transportation of high strength wire rope, such as lifting and pulling

scrap standard of wire rope sling:

in case of one of the following situations, the wire rope sling shall be stopped using, repaired or scrapped:

1, the wire rope is broken by one strand, or the surface steel wire abrasion reaches more than 40% of the wire diameter, or the wire rope diameter is reced by more than 7%

2

3. The broken wire of wire rope in a lay distance exceeds the standard (Table 9): (1) when the broken wire phenomenon occurs locally, and the broken wire occurs on one strand in a section of 6 times the diameter, it shall be scrapped when it reaches half of the specified number of broken wires 2) When the wire rope is corroded or worn, the number of discarded broken wires shall be multiplied by the rection factor (Table 9)

4. Broken wires were found in some parts of the wire rope (more than three broken wires gathered together)

5. The broken wires appeared on the surface of the eyelet, or the broken wires were concentrated in the metal sleeve, near the joint and in the joint strand

6. The strength of the wire rope decreases e to the burning of the wire rope, the immersion of molten metal, or the long-term exposure to high temperature

7. The socket was severely squeezed and worn; The metal casing is damaged (such as crack, serious deformation, corrosion) or the diameter is reced to 95% of the original diameter

8. The metal sleeve or plug-in part of the rope end fixed connection slipped out

The theoretical calculation formula of breaking force is as follows:
F = k ′ D2R / 1000, where:
f-minimum breaking force of wire rope, kn
d-nominal diameter of wire rope, Mm
k ′ - the minimum breaking force coefficient of wire rope with a specified structure
k ′ value can be seen in relevant wire rope data
R - nominal tensile strength of wire rope, MPA
minimum breaking force coefficient of wire rope K ′
the breaking force of wire rope is the most important index in all mechanical property indexes of wire rope, which can be expressed by the total breaking force of the whole rope. The breaking force of the whole wire rope is a scientific indicator which can fully reflect the actual bearing capacity of the wire rope. It is closely related to the tensile strength, structure, lay distance and lay quality of the wire rope. At present, both foreign and domestic standards of steel wire rope for important use clearly stipulate that the breaking force of steel wire rope is only provided, rather than the total breaking force of steel wire rope. The total breaking force of steel wire rope is that the early steel wire rope enterprises in our country did not have the ability to make the total breaking force of the whole steel wire rope to indirectly reflect the breaking force of steel wire rope. With the continuous improvement of China's steel wire rope instry test means and the continuous improvement of test equipment, the total breaking force test of steel wire rope will graally decrease, which will be mainly used for the estimation of the breaking force of large diameter steel wire rope in the future