Question

Please explain what is the difference between engineering stress and true stress in a tensile test?

Answer 1

Answer:

Explanation:

Engineering Stress is defined as Load applied to the original cross-sectional area which we have taken in the start.

True stress is defined as the load divided by area of cross-section of specimen at that instant.

Engineering stress  and true stress can be expressed by relation

$\sigma _T=\sigma _E\left ( 1+\epsilon _E\right )$

Where

$\sigma _T=True\ stress$

$\sigma _E=Engineering\ stress$

$\epsilon _E=Engineering\ Strain$