Tensile testing of a ductile metal produces a stress strain curve for the metal

Question

Tensile testing of a ductile metal produces a stress strain curve for the metal showing elastic deformation up to the yield stress (o) followed by work hardening until the ultimate tensile strength (UTS) is reached Question: If the tensile test is a) stopped at some point between the yield stress and the ultimate tensile stress, then b) the specimen is unloaded and finally c) the tensile test is restarted. Which of the following statements is correct? a) The specimen shows a lower modulus and a lower yield stress b) The specimen shows higher modulus and a higher yield stress c) The specimen shows no change in modulus and a lower yield stress d) The specimen shows no change in modulus and a higher yield stress

Explanation / Answer

a) no

b) no

c) yes

Reason: from my point of veiw, Young's modulus is dependent on bond strength at the atomic level.

Cold working distorts the crystal structure by introducing fractures resulting in dislocations that hardens the material, but the atomic bonds that define elasticity are not affected.

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