Question

Consider the following salient points in a stress•strain curve of a mild steel bar:
1. Yield point
2. Breaking point
3. Yield plateau
4. Proportionality limit
5. Ultimate point
The correct sequence in which they occur while testing the mild steel bar in tension from initial zero strain to failure is

• A. $4,1,2,3$ and $5$
• B. $1,4,3,5$ and $2$
• C. $4,1,3,5$ and $2$
• D. $1,4,2,3$ and $5$

Answer 1

The correct option is C $4,1,3,5$ and $2$

The stress-strain curve of a mild steel bar under tension is shown below:


a : Proportionality limit: Upto this Hooke's law is valid and stress is proportional to strain.
b : Elastic limit: From a to b stress is not proportional to strain, while it remains elastic.
c : Upper yield point: From b to c material goes to plastic stage
d : Lower yield point
de: Yield plateau: Yielding of material at constant stress.
f : Ultimate point: Maximum stress to which the material can be subjected in a simple tensile test.
g : Breaking point : Point where the material breaks.