Question

The ratio of applied load to instantaneous cross section area is called

• A. Engineering stress
• B. True stress
• C. Engineering strain
• D. True strain

Hint:

True stress = load / instantaneous area. Engineering stress = load / original area. Know the distinction for stress analysis.

Answer 1

The Correct Option is B

True stress is defined as the ratio of the applied force to the actual (instantaneous) cross-sectional area of the specimen at a given point in time during deformation.
\[ \text{True Stress} = \frac{\text{Force}}{\text{Instantaneous Area}} \] In contrast:
- Engineering stress uses the original cross-sectional area.
- Engineering strain and true strain are measures of deformation, not force per area.
True stress gives a more accurate representation of material behavior under large strains, especially during plastic deformation.