What is the term for the ratio of the diameter of a bend to the nominal diameter of the rope?

The term that refers to the ratio of the diameter of a bend to the nominal diameter of the rope is indeed known as the bend ratio. This concept is crucial in rigging and hoisting as it helps in determining how much the rope can safely bend without compromising its integrity.

When a rope bends around a sheave or a hook, the angle and the ratio of the bend can affect the tension elements and the overall strength of the rope. A larger bend ratio indicates a gentler bend, which is less likely to damage the rope and allows it to maintain its load-carrying capacity. In contrast, a smaller bend ratio could lead to kinking or excessive wear, resulting in reduced performance or failure of the rope over time.

Understanding bend ratios is essential for ensuring safe rigging practices and optimizing the lifespan of hoisting equipment.