Two questions in Mechanical
Hello, I'm new in the forum and I got two questions. At the first place I would to apologize if this isn't the right forum to ask these questions, but here I go:
 Question 1 
I'm modelling a plate with a hole under plane stress, which is tension in both x and y directions and also shear in the XY plane.
To run this model I have to turn off Solver Pivot Checking. My question is this: What would be "the proper way" to set up this model? In other words, what displacements restrictions should I use?
 Question 2 
In the same problem, I would like to change just one of each value of sigmax, sigmay and tauxy instead of changing 2 , 2 and 4 respectively. Is there "a shortcut" to do this in a shorter way? May be adding an APDL command or something.
Best regards.
Sofia.
Best Answer

peteroznewman Member
For pure shear, I would put a Remote Displacement, behavior = deformable, on the bottom edge and fix all DOF. The deformable edge allows the Poisson's ratio to take effect if you were to have some tensile stress in the X or Y directions.
Then I would put shear and/or tensile forces on the the left, top and right edges.
Answers
Hi @sofia_mdh You could split the rectangle horizontally and vertically in the middle and apply the normal displacement =0 on those edges.
Hi @rkumbhar , that works fine when there is only tensile stress in x and y direction, but for example a pure shear state, at least for me is not that clear what boundary conditions I should apply.
Also, applying displacements equal to zero makes me get an answer, but I still get warning messages. Is there a way to turn them off?
@sofia_mdh
For pure shear, I would put a Remote Displacement, behavior = deformable, on the bottom edge and fix all DOF. The deformable edge allows the Poisson's ratio to take effect if you were to have some tensile stress in the X or Y directions.
Then I would put shear and/or tensile forces on the the left, top and right edges.
Thank you Peter!