The principal in-plane stresses and associated strains in a plate of material are σ1 = 50 ksi, σ2 = 25 ksi, ε1 = 1050 µ, and ε2 = 195 µ. (a) This is a plane stress state, meaning the principal stress normal to this plane is zero. Is the principal strain ε3 acting normal to this plane also zero? Show why or why not. Draw the 3D Mohr’s circle for both stress and strain states.
(b) Determine the Modulus of Elasticity, E.
(c) Determine Poisson’s ratio, ν.

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