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Mechanical Metallurgy Mcqs

Q:

Hooke’s law is obeyed till _____________ in stress-strain curve.

A) propositional limit point B) yield point
C) tensile Strength Point D) failure point
 
Answer & Explanation Answer: A) propositional limit point

Explanation: The stress-strain curve defines the relationship between force and elongation of any material. This curve can be divided into 2 major parts.
First one is the linear part, which starts at the origin and extends up to the propositional limit. In this region, slope of the curve remains linear and constant. The slope of the curve is known as young modulus.
The second part is the non-linear part, which begins after the proportional limit point. The relational ship between stress and strain is non-linear in this region. Simple Hooke’s law will not be enough to define the nature of the curve.

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