3. A thin square plate is subjected to a uniaxial compression (>0) and an in-plane shear of the same magnitude, as shown in the figure below. Assuming that the plate consists of a linearly elastic homogeneous and isotropic material of yield strength Oy, then determine at what value of applied the plate will fail if it subscribes to: (a) A Von Mises failure criterion, (b) A maximum (tensile) principal stress criterion, (c) A Tresca failure criterion. (d) In terms of design, which would be the most conservative criterion in this case? 9 y