Question

A material upon heavy stress undergoes a deformation and lands a part of permanent set. Upon removal of the stress, the material will

• A. return to its original position
• B. become permanently plastic
• C. start oscillating about the elastic point
• D. start oscillating about the yield point

Answer 1

The correct option is B become permanently plastic

The material is said to have taken on permanent set or plastic deformation, if the material has been stressed beyond its yield point.
The correct option is (b)