Identical inputs producing linear vs. non-linear displacement outputs in 2D axisymmetric model

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Hello everyone,

I am working on a load-deformation model in COMSOL Multiphysics 6.3 (using the Solid Mechanics interface in a 2D axisymmetric setup) and ran into a baffling issue.

I have two output plots evaluating the displacement field (solid.disp), but they are behaving completely differently: (Attached: Screenshots)

• Output 1 shows a linear displacement gradient with a straight vertical profile.

• Output 2 shows a non-linear displacement with a proper physical bulge at the midpoint (which is my desired and correct result).

I have double-checked my boundary conditions, material properties, constitutive models, and study settings. They are identical between both runs/plots. Yet, I cannot seem to understand why one view evaluates linearly while the other captures the expected non-linear behavior.

Does anyone know what might be causing this discrepancy or what hidden setting I might be missing in my dataset, evaluation frame, or plot configuration?

Any guidance would be greatly appreciated!



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