Question

Q1. In the engineering stress-strain diagram of mild steel maximum strees point is ? (A) upper yield point (B) lower yield point (C) ultimate strees point (D) breaking point

Answer 1

Answer:

Hooke’s Law

Hooke’s Law states that for small deformities, the stress and strain are proportional to each other. Thus,

Stress \(\propto\) Strain

Or, Stress = k × Strain … where k is the constant of proportionality and is the Modulus of Elasticity. It is important to note that Hooke’s Law is valid for most materials.

Answer 2

In the stress-strain curve of mild steel, the maximum stress point is the ultimate stress point.

• The stress-strain curve is the graphical representation of the reaction exhibited by a material when load is applied upon. This curve is utilized for the study of the mechanical properties of a material.
• The stress-strain curve consists of different regions they are proportional limit, elastic limit, yield point ultimate stress point, and breaking point.
• Hooke’s Law states that the strain of the material is directly proportional to the stress applied within the elastic limit of that material.
• In the case of mild steel, the maximum stress point is the ultimate stress point which corresponds to the point where the material can handle the maximum force before it gets fractured.

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