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.

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

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

Final AnswerYield point.