A wedge socket can withstand only approximately what percent of the rope's breaking strength?

A wedge socket can withstand only approximately what percent of the rope's breaking strength?

• A. 50%
• B. 60%
• C. 75%
• D. 90%

Answer: (C)

The key idea is that a rope termination isn’t able to carry its full breaking strength. A wedge socket grips the rope by compressing and creating friction at the contact points, which concentrates stress in a small area and can crush or damage fibers. Because of these losses, the assembled rope with a wedge socket is rated well below the rope’s raw breaking strength. In practice, a wedge socket is considered safe to carry about three-quarters of the rope’s breaking strength, i.e., roughly 75%. That balance accounts for the grip provided by the wedge while recognizing the reductions caused by termination and any dynamic loading. The other percentages would either overstate the capacity (too close to the breaking strength) or be unnecessarily conservative for typical terminations.

The key idea is that a rope termination isn’t able to carry its full breaking strength. A wedge socket grips the rope by compressing and creating friction at the contact points, which concentrates stress in a small area and can crush or damage fibers. Because of these losses, the assembled rope with a wedge socket is rated well below the rope’s raw breaking strength. In practice, a wedge socket is considered safe to carry about three-quarters of the rope’s breaking strength, i.e., roughly 75%. That balance accounts for the grip provided by the wedge while recognizing the reductions caused by termination and any dynamic loading. The other percentages would either overstate the capacity (too close to the breaking strength) or be unnecessarily conservative for typical terminations.