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Dear users, I am running a modal analysis in Optistruct for a simple 2D plate in order to validate some Matlab scripts. I use CQUAD4 elements (PSHELL 2D property) in HM. Results from OS are consistent if I compare them with a 6-DOF per node element in Matlab. Now, I would like to compare the same case for membrane elements (2-DOF per node) but I am not able to find a way to model a membrane in HM. Any suggestion about a different element? Thank you Regards Fabio