Question: Three principal stresses ( 1 = 220 MPa , 2 = 100 MPa and 3 = -80 MPa ) which are mutually perpendicular to one

Three principal stresses (₁= 220 MPa, ₂=100MPaand ₃=-80MPa) 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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