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Which one of the following is the definition of ultimate tensile strength (UTS) obtained from a stress-strain test on a metal specimen?

1. Stress value where the stress-strain curve transitions from elastic to plastic behavior
2. The maximum load attained divided by the original cross-sectional area
3. The maximum load attained divided by the corresponding instantaneous cross-sectional area
4. Stress where the specimen fractures

Correct answer: The maximum load attained divided by the original cross-sectional area

Solution

Ultimate tensile strength (UTS) is defined as the maximum load a material can withstand divided by its original cross-sectional area, reflecting its ability to resist deformation and failure under tension.

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