Unexpected discrepancy when solving a plate bending problem using weak form pde module

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Hi there,

I am trying to solve the deformation of a boundary clamped thin circular plate bearing uniform pressure. This problem possesses axisymmetry, but I also tried to solve it in 2D space (model 2D) besides the 1D axisymmetric space (model 1D) for validation.

It seems there is something wrong with model 2D: i) the model is hard to converge; ii) even if it converged, the deflection would be larger than theoretical prediction and show dependence on poisson ratio.

By comparison, model 1D works well.

I would appreciate if you could give me a hint.

Best,

HC L


If we take a=2, q=1, D=1000, and an arbitrary nu, the center deflection is theoretically 2.5e-4.

details about model A (the picture is also attached below): model A

details about model B (the picture is also attached below): model B



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