Strain energy
In physics, strain energy is the energy stored by a system undergoing deformation. When the load is removed, strain energy as:
![U = \frac 1 2 V \sigma \epsilon = \frac 1 2 V E \epsilon^2 = \frac 1 2 \frac V E \sigma^2](/Images/godic/202501/10/a466c2ae0cffb0950c0b6b36e47eb26e5217.png")
where σ is stress, ε is strain, V is volume, and E is Young's modulus:
![E = \frac \sigma \epsilon](/Images/godic/202501/10/166873ac3dacbea4a32fbd91dd27b8b75217.png")
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