Project ForgeStrength of Materials
Stress & Strain
GATE 2022
Easy
Which one of the following is the definition of ultimate tensile strength (UTS) obtained from a stress-strain test on a metal specimen?
- AStress value where the stress-strain curve transitions from elastic to plastic behavior
- The maximum load attained divided by the original cross-sectional area
- CThe maximum load attained divided by the corresponding instantaneous cross-sectional area
- DStress where the specimen fractures
Explanation
Ultimate tensile strength (UTS) is defined using the ENGINEERING stress convention: the maximum load reached during the test, divided by the specimen's ORIGINAL (undeformed) cross-sectional area — not the instantaneous area (which would give the true stress instead), and not the yield point or fracture point.
Source: GATE ME 2022 Session 2 (ME-2) (2022)
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