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Mesh refinement results: 

Our results converged with a mesh of don't change significantly on refining the mesh. The medium and finest meshes yield virtually identical results. So we'll use the results from the medium mesh (element size of 0.1 in. 05 in) to compare with the thin-walled and thick-walled hand calculations.

Comparison with thin and thick-walled theory from the pre-analysis:

Our FEA model confirms that the results compare very well with thick-walled approximation is more adequate for this geometry. theory. For this geometry, the thin-walled theory is less accurate but in the right ball park (to within about 20%).

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