GATE 2017 ME (ME1) – Question 35
On the engineering stress–strain curve for mild steel, ultimate tensile strength refers to
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Correct answer: (C) Maximum stress.
Explanation
Engineering stress is load divided by original specimen area. Ultimate tensile strength is its largest value, corresponding to the maximum tensile load. It is therefore the maximum engineering stress, C. Yield stress occurs earlier, while engineering stress can fall after necking before fracture.