Strain energy due to sudden axial load is given by:$$[\sigma]$$:resultant stress
P : Axial load
$$\triangle$$: detornator
$$\epsilon$$: strain
E : modulous of elasticity

A

$$ \frac{1}{2} \triangle$$

B

$$[\sigma]$$.$$\epsilon$$

C

P $$\triangle$

D

\frac{\sigma^{2}}{2E}