1. The problem statement, all variables and given/known data For the state of stress shown in the figure, normal stress acting on the plane of maximum shear stress is? 2. Relevant equations Normal stress σn = σcos2θ 3. The attempt at a solution Plane of maximum shear stress is 45o relative to the max stress of 100MPa. So the total normal stress is 75MPa (compression). I have assume the direction of normal stresses in both the cases with respect to applied stress. Have I assumed the direction in both cases correctly? Thanks in advance!