REDWIRE Wire-rope stretch and how to calculate it, according to Bergen

January 20, 2021 REDWIRE is news you can use from leading suppliers. Powered by FRASERS.

Posted by Bergen Cable Technology, Inc


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Bergen is a team of experts in cable and wire rope.

Bergen Cable’s decades of international success result from two important factors: great products and unmatched expertise. The company offers ample cable information on its website, including a Cable 101 page – which includes a section on wire-rope stretch. This is a trait that should be considered when customers select wire rope for any purpose. Customers should also consider the stretching factor when inspecting the wire rope that their employees are using. It is wise to check the stretch regularly when wire rope is carrying a load, according to most occupational health and safety standards.

Structural and elastic stretch

Although many people use the term “wire rope” as a synonym for “cable”, the former is rope with diameters higher than 3/8 of an inch. Two main factors affect wire-rope stretch: structural and elastic stretch. Elastic stretch is caused by wire elongation, and structural stretch by a combination of lengthening the rope lay, compressing the core, and adjusting the wires and strands to the load held by the rope.

Many variables affect structural stretch – the ore size, the length of the lays, the wire rope’s construction, and the loads and amount of bending that workers impose on the wire rope. To estimate the quantitative value of the structural stretch, multiply the length of the rope by 0.005 when it is carrying a medium-weight load, by 0.01 for a heavy load, or by 0.0025 for a light load.

Elastic wire-rope stretch is proportional to load weight and rope length when it holds a load under the rope’s elastic limit, according to Bergen. The elastic limit of galvanized wire rope is typically about half of its breaking strength, or approximately 60 per cent in the case of stainless steel rope. Elastic stretch is inversely proportional to the wire rope’s metallic area and modulus of elasticity. To calculate the elastic stretch in feet, one multiplies the load weight in pounds by the rope length in feet and then divides the answer by the metallic area in square inches multiplied by the modulus.

For wire-rope expertise, turn to Bergen Cable.

To learn more, contact Bergen.


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Posted by Bergen Cable Technology, Inc


Mfr Mechanical Cable, Cable Assemblies & Push-Pull Controls. Original Mfr Of Safety Cable, A Patented Fastener Reten... Read more

Contact supplier