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)

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RRB JE ME CBT 2 Previous Paper 1: Held on 29 Aug 2019

Answer 1

Concept:

When a body is loaded within the elastic limit, it changes its dimensions and on the removal of the load, it regains its original dimensions.
So long as it remains loaded, it has stored energy in itself.
On removing the load, the energy stored is given off as in the case of a spring.
This energy, which is absorbed in a body when strained within the elastic limit, is known as strain energy.
The strain energy stored in a body due to external loading, within the elastic limit, is known as resilience and the maximum energy which can be stored in a body up to the elastic limit is called proof resilience.
Strain energy stored in a body due to tensile or compressive load or resilience:

Modulus of resilience: The proof resilience per unit volume of a material is known as modulus of resilience.