Wire Rope Bend Fatigue

Resistance to bend fatigue is a key factor in determining the service life of a wire rope, which will help determine if you have the right crane rope for the job.

Bend fatigue is the fatigue that happens to the wire rope when it works around sheaves.  This is particularly harsh when reverse bends are in the reeving system.

Reputable manufacturers will carry out extensive testing at their factories.   This ensures the products are continually being improved.  The importance of this testing is paramount to making sure that the product performs at a high level.

Bend fatigue testing involves cycling a length of crane rope through a sheave (or number of sheaves) at a constant tension.  This is generally done with results recorded when the wire rope reaches recommended discard factors.  Another key result is ultimate failure.

Higher tensile ropes are now more popular.  Combined with smaller diameter sheaves in tighter headroom spaces, this puts significant bend fatigue on wire ropes.  This places a lot of importance on wire rope lubrication and regular wire rope maintenance to ensure you get the optimal performance from your rope.

It is important to discuss your wire rope requirements with someone experienced in both the product and its application.  Most requirements are with the wire rope being in use.   If you have a new application it is best practice to discuss your proposed reeving system with a wire rope professional to ensure you can match up the ideal wire rope to your application.

If you would like to discuss this article or anything wire rope, please contact the team at Crane Ropes Australia