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How can the mean stress of fatigue be evaluated?

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How can the mean stress of fatigue be evaluated?

(a) Pascal’s equation

(b) Soderberg equation

(c) Heisenberg’s equation

(d) Goodman relation

The question was asked by my school principal while I was bunking the class.

The question is 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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Right answer is (d) Goodman relation

Easiest explanation: The Goodman diagram is used to plot the mean stress against the alternating stress. This is used to show when a material fails under a number of cycles. This is also known as the Haigh diagram or Haigh-Soderberg diagram.

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