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Tension test terminology: stress level where extension accelerates with small load increase From a standard stress–strain curve in tension, identify the stress at which the extension increases more rapidly than the increase in load.

Difficulty: Easy

Elastic limit
Yield point
Ultimate stress
Breaking stress

Correct Answer: Yield point

Explanation:

Concept
At the yield point, a small increase in load produces a disproportionate increase in strain (onset of plastic flow in ductile materials).

Notes
Elastic limit: end of linear behavior; Ultimate: maximum nominal stress; Breaking: fracture.

Final Answer
Yield point.

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