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A materials proof stress is also referred to as ___________

(a) elastic limit

(b) yield limit

(c) proportional limit

(d) set method

The question was asked in examination.

Origin of the question is Aircraft Materials in chapter Testing Aircraft Materials of Aerospace Materials & Processes

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The correct answer is (c) proportional limit

For explanation: Proof stress of a material can also be called a proportional limit. The procedure to find the elastic limit and proof stress are similar, but the quantities are different. Yield limit can be found through tension testing, but it is not the same as proof stress.

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