Can anyone point me to any source or document that has any information regarding the plate element formulation in FEMAP? I only know that it uses CQUAD4 which is based on Mindlin-Reissner plate theory. Any more detailed information would be appreciated.
You can learn more about plate element formulation in the Femap Help, Section 6.2 "Plane Elements". If you are creating an NX Nastran input file, you can easily access all NX Nastran documentation by going to Help > NX Nastran. The NX Nastran "Element Library Reference" will likely be useful to learn more about formulation.