What is the name for the ability of a metal to resist being twisted apart?

Torsional strength is the correct term used to describe a metal's ability to resist being twisted apart. This property is crucial in applications where materials are subjected to twisting forces, such as in shafts, axles, and other components that may experience torsion during use. Torsional strength is determined by the metal's inherent properties, including its composition and structure, and it influences how well the metal can maintain its integrity under stress.

Flexural strength refers to a material's ability to resist deformation under load, specifically in bending situations, rather than twisting. Shear strength deals with the resistance of a material to being sliced or sheared apart along a plane. Tensile strength measures how much load a material can handle while being pulled or stretched before failing. Therefore, these other terms describe different stress scenarios, while torsional strength directly addresses the twisting action that can lead to material failure.