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The stress below which the material does not fail is called _________

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The stress below which the material does not fail is called _________

(a) Fatigue stress

(b) Endurance limit

(c) Fatigue life

(d) Total stress

This question was posed to me by my school principal while I was bunking the class.

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

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Right choice is (b) Endurance limit

Explanation: Fatigue limit or endurance limit is defined as the value of stress below which the material does not fail even as it is loaded for an infinite number of cycles. The total number of cycles required to bring about the final fracture is called fatigue life.

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