The strain energy stored in a body, when the load is gradually applied, is
where σ = Stress in the material of the body
V = Volume of the body and
E = Modulus of elasticity of the material.
1
\(\frac{\sigma E}{V}\)
2
\(\frac{\sigma V}{E}\)
3
\(\frac{\sigma^2 E}{2V}\)
4
\(\frac{\sigma^2 V}{2E}\)