Question

Flow stress is defined as the instantaneous value of stress required to continue the deformation of metal.

(a) True

(b) False

I have been asked this question during an interview.

This intriguing question originated from Behaviour in Metal Forming topic in section Forming Process of Casting-Forming-Welding II

Answer 1

The correct option is (a) True

The best I can explain: Flow stress is generally defined as the instantaneous value of stress which is required to continue the deformation of metal, which means to keep the material flowing. It is also defined as the yield strength of the material as a function of strain, or the strength that determines the forces required to complete a specific forming operation.