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Non linear static simulation with cyclic symmetry on a 10 deg slice of a steel end-cap subject to external pressure.
Mesh size set manually to have a few elements across the thickness.
Follower pressure is used to keep pressure load orientation normal to elements during deformation.
pressure is defined as  1000 x t  in bar
Steps interval reduced wrt to default settings (0.01 seconds steps), simulation duration maintained to 1s.
The model initially had convergence issues so I also increased the amount of Newton iterations to 50.
A Point data captures the displacement of the top point and allows to track buckling initiation.

cyclic symmetry | SimScale Project Library | Page 1