Question

Which of the following statement is true regarding residual stresses?

(a) residual stress result in local early strain hardening

(b) it increase plastic range of member

(c) it is not important when fatigue is involved

(d) it improves strength of member

This question was addressed to me during a job interview.

My question comes from Angles Under Tension and Factors affecting Strength topic in chapter Design of Tension Members of Design of Steel Structures

Answer 1

Right choice is (a) residual stress result in local early strain hardening

The explanation is: Residual stress result in local early strain hardening and reduce plastic range of member. Residual stresses have no consequences with respect to static strength of member, they can be important if fatigue is involved.