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mrife
Ansys Employee

Hi Vladyslav

Shell28 element type was undocumented at version 17.  The recomended replacement is to use Shell181 (the default linear shell) with orthotropic material properties and to change its keyopt 1 to be 1 to set the stiffness behavior to be membrane.  If you are using a fairly new version of WB Mechanical these are UI options and you should not need a commands object at all.

Mike

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