You are right, but to check the validity of model had a look at all of the principal stresses. How do I believe the results from Ansys if one of the principal stress is not what it should be from theory? If one of them is wrong so can the rest.
Also I did the same problem on ABAQUS and it showed the expected results with one principle stress zero everywhere.
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New Post - Reply To: Principle Stress (Out of Plane) not zero in plane stress 2D problem