A material of Young's modulus $' E'$ and Poission's ratio $' μ'$ is subjected to two principal stress $σ_{1}$ and $σ_{2}$ at a point in a

two-dimensional stress system. The strain energy per unit volume of the material is

- 1
  
  $\frac{1}{2 E} ({σ_{1}}^{2} + {σ^{2}}_{2} - 2 μ σ_{1} σ_{2})$
- 2
  
  $\frac{1}{2 E} ({σ^{2}}_{1} + {σ^{2}}_{2} + 2 μ σ_{1} σ_{2})$
- 3
  
  $\frac{1}{2 E} ({σ^{2}}_{1} - {σ^{2}}_{2} + 2 μ σ_{1} σ_{2})$
- 4
  
  $\frac{1}{2 E} ({σ^{2}}_{1} - {σ^{2}}_{2} - 2 μ σ_{1} σ_{2})$

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