Hello, I have been trying to program a basic bending element - 4 node quadrilateral, pure displacement formulation. I am stuck - I'm doing something wrong, but I can't find the mistake, therefore I would like to ask you for your help. I can't look for advice from anyone from educational...
I have been trying to calculate accumulated plastic strains in cylindrical storage tank (20 m height, 20 m diameter) that lost stability due to internal underpressure. The shape of the container after being subject to buckling is given. So basically the analysis should consist of 4 steps:
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