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What is the diameter of a typical specimen used in fatigue testing?

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What is the diameter of a typical specimen used in fatigue testing?

(a) 2000 inches

(b) 0.0005 inches

(c) 1 inch

(d) 26 inches

I have been asked this question in homework.

This interesting question is from Aircraft Materials topic in division Testing Aircraft Materials of Aerospace Materials & Processes

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Best answer
Right choice is (c) 1 inch

For explanation I would say: Specimen of fatigue tests are typically rolled or forged bar stock. The are one inch in diameter. They can vary depending on the requirements and the material being tested to determine fatigue strength.

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