Question

A metal bar is of length 2.0m and has a square cross-section of side 40mm. when a tensile

force of 80KN is applied, it extends by 0.046mm. Calculate (a) the stress (b) the strain in the

specimen

Answer 1

(a) The stress:

$$\sigma=F/A=50\text{ MPa}.$$

(b) The strain:

$$\epsilon=\frac{\Delta L}{L}=2.3·10^{-5}.$$