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How to calculate Wire rope loads

HOW TO CALCULATE WIRE ROPE LOADS

There Are different types of loads to consider, static loads, dynamic loads, bending loads, and the total load, below for your convenience we have listed the calculations for determining the calculation of wire rope loads.

STATIC LOADS;

This is often used when considering safety, atred pressures etc.

Static load = weight of suspended wire rope + weight of wire rope end load (payload/attachments etc.)

WS = WR + WL

Factor of safety + minimum breaking load / static load                FOS =MBL/WS

DYNAMIC LOADS;

The increased value of the static load due to acceleration. Because the wire rope is elastic the end may turn, increasing the rate of acceleration. A factor of 1.5 is applied to the mean rate of acceleration to account for this.

Dynamic load =static load x 1.5 x rate of acceleration / gravitational constant                     WD =WS x 1.5 x a / g

BENDING LOADS

The extra load induced in the outer wires as they are bent over a sheave or drum. This load increases with the outer wire diameter but decreases with larger drum or sheave diameters.

Bending load =outer wire dia. x cross sect rope area x app mod of elasticity / drum or sheave diameter         WB=d x axe / d

Where A = x (rope dia²⁾ / 4  E from earlier values.

TOTAL LOADS

Used as a guide to help decide which wire rope you need.

If the total load is over 25% of the actual breaking load of a wire rope, it is likely to suffer premature fatigue of the wires in the rope.

So as a guide to get a satisfactory fatigue life  total load    x 100 ≤ 25

Breaking load

This does not take into consideration the effects of wear, corrosion and other affecting factors, and rope life.

Total load = static load + dynamic load + bending load

      WT       =       WS        +        WD           +        WB

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