The elastic energy stored in a wire of Young's modulus $Y$ is
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When a wire is stretched work is done against the interatomic forces. This work is stored in the wire in the form of elastic potential energy.
$W=\frac{1}{2} \times$ stress $\times$ strain $\times$ volume of wire
Also, when strain in small, ratio of longitudinal stress to corresponding longitudinal strain is called Young's modulus of material of body.
$Y=\frac{\text { longitudinal stress }}{\text { longitudinal strain }}$
$W=\frac{1}{2} \times \text { stress } \times \frac{\text { stress }}{Y} \times \text { volume }$
$W=\frac{(\text {stress)}^2 \times \text { volume }}{2 Y}$
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