The state of plane stress in a body is described by the following stresses: 1 = 8500

Question:

The state of plane stress in a body is described by the following stresses: σ1 = 8500 kN/m2 compression, σ3 = 1500 kN/m2 tension. Determine by means of the Mohr circle the normal stress and shear stress on a plane inclined at 20° to the plane on which the minor principal stress acts. Check the results analytically. (After A. Casagrande.)?