Which method is used to obtain Yield point?

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Question

This question was previously asked in

JKSSB JE Civil Jal Shakti 6 Dec 2022 Official Paper (Shift 2)

Answer 1

Concept:

Off-Set Yield Method:

The offset yield strength method is an arbitrary method of estimating the elastic limit of a material.
Offset yield strength is the stress that corresponds to a point at the intersection of a stress–strain curve and a line that is parallel to the specified modulus of the elasticity line.
This parallel line is offset horizontally by a predetermined amount.
The intersection point represents the yield point of the material being tested.
The value of the offset, expressed as a percentage of the strain, is arbitrarily defined by the material testing standard being used.
The most common offset is 0.2%, but this can vary depending on the material.