A keyting is made by wrapping a length of straight stainless steel wire around t

Question

A keyting is made by wrapping a length of straight stainless steel wire around the circumference of a cylindrical metal mandrel (tool). Once the keyring is removed from the mandrel, its internal diameter will always be larger than the diameter of the mandrel. This is because: Select one a Stainless steel is very difficult to form into a ring b Recovery of elastic strain occurs C Precise control of deformation processes are difficult to achieve. d. Stainiess steel has a face centred cubic crystal structure

Explanation / Answer

Because elastic strain recovery occurs

A steel wire is wound around a shaft, it doesn't attain 100% deformation and remains in deformed shape. This is due to strain recovery of steel. In the same way when a stainless steel wire is wound around a mandrel or shaft and shaft is removed and force on wire is released due to elastic strain recovery the spiral wire attains greater diameter than mandrel or shaft.

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