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The fatigue fracture occurs __________

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The fatigue fracture occurs __________

(a) Below yield stress

(b) Below tensile stress

(c) At stress-strain point

(d) Above tensile stress

I got this question at a job interview.

My question is taken from Impact Tests on Metals, Fatigue Tests topic in section Wear of Metals, Mechanical Properties and Testing of Engineering Material & Metallurgy

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Correct answer is (b) Below tensile stress

Explanation: Fatigue fracture is defined as the fracture that takes place under repeatedly applied fatigue stresses. It generally occurs at stress well below the tensile stress of the materials.

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