Question: Three principal stresses ( sigma 1 = 2 2 0 MPa, sigma 2 = 1 0 0 MPa and sigma 3 =

Three principal stresses (\sigma 1=220 MPa, \sigma 2=100 MPa and \sigma 3=-80 MPa) which are mutually perpendicular to one another are applied to a cube of aluminum metal. The modulus of elasticity of aluminum is E =69 GPa and its Poissons ratio is v =0.3.
(A) Calculate the magnitudes of the principal strains.
(B) Calculate the strain energy per unit volume.

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