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Strain energy stored in an axially loaded member is:

AFL
B½ Fδ
CU = ½ Pδ = P²L/(2AE) = σ²V/(2E) where V = volume
DRandom
Answer & Solution
Correct answer: C. U = ½ Pδ = P²L/(2AE) = σ²V/(2E) where V = volume
**Strain energy:** U = ½ × force × deformation (elastic, linear). **Expressions:** U = ½ Pδ = P²L/(2AE) = (σ²/2E) × V. Used in Castigliano's theorem for deflection calculation, virtual work.
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