Question

The presence of residual stresses in a component can prevent failure of the casting component.

(a) True

(b) False

I have been asked this question by my school teacher while I was bunking the class.

Origin of the question is Residual Stress in section Cooling and Solidification of Casting-Forming-Welding I

Answer 1

The correct option is (a) True

Explanation: Residual stresses may play an important role in explaining or preventing failure of a component at times. For example, shot peening of component to induce surface compressive stresses, in which residual stresses prevent failure and also improves the fatigue life of the component. But the internal or residual stresses should be kept balanced in the casting component.