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I am trying to model a simple plane stress problem using Ansys. I am using Ansys 14.0.

The problem is a simple square plate, with out a corner, and with a hexagon hole around the midle. The boundary conditions consist of a constant pressure on the top side, and full constrain on the bottom.

In order to study the convergence, I listed the maximum displacements and stress on the entire domain. I realized that thedisplacements converged fairly good. However none of the stresses, namely [itex]\sigma_{x}[/itex], [itex]\sigma_{y}[/itex] and [itex]\sigma_{xy}[/itex], converge. You can see on the attached image, how bad the situation is. I don't know exactly why is this happening.

On the attached image I have ploted the converge study for the [itex]\sigma_{x}[/itex] stress only. Note that on the last mesh, I used a mesh 5 times finer that the previous one. Also, the last meshes arehighlydense. In fact the 5th mesh from the bottom already corresponds to 50 elements on the right side.

also,

The thickness is around 0.01 [m].

I used plane182 elements, with element behaviour selected as plane stress with thickness.

Any help is appreciated,

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# Stress convergence, Ansys

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