Strength of materials: definition of strain energy stored in a loaded member Consider a ductile or brittle specimen stressed within the elastic limit. Choose the statement that correctly defines strain energy.

Given/Concept
Strain energy is the elastic energy stored in a member due to deformation under load, provided the loading is within the elastic limit so that unloading would recover the energy.

Clarifications
• Strain energy (general) ≠ maximum strain energy (that is proof resilience for a body).• Proof resilience per unit volume is a specific quantity (area under the stress–strain curve up to the elastic limit divided by volume), not the general definition.

Final Answer
Energy stored in a body when strained within elastic limits.