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In the computation of engineering stress, the actual or instantaneous cross-sectional area is used.

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in Casting-Forming-Welding II by (119k points)
In the computation of engineering stress, the actual or instantaneous cross-sectional area is used.

(a) True

(b) False

The question was posed to me by my school teacher while I was bunking the class.

This interesting question is from Relationship between Tensile and Shear Yield Stress in division Types of Die & Metal Forming Processes of Casting-Forming-Welding II

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Right option is (b) False

The best I can explain: The original cross sectional area is used in the computation of engineering stresses. But in computation of true stresses, the instantaneous cross-sectional area is used. Because of the length and cross-sectional area both changes at every instant during loading of material. The instantaneous load divided by instantaneous cross-sectional area is called true stress.

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