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EIGC: Defines data required to perform complex eigenvalue analysis.
EIGRA: Defines the data required to perform real eigenvalue analysis with the Automated Multi-Level Sub-structuring technique.
If your model is a sheet metal or a platic component, please extract mid surface and start meshig with 2D elements. Otherwise you can mesh with 3D elements.
Hi,
Refer the following link or Optistruct User Guide
https://altairhyperworks.com/hwhelp/Altair/2017/help/os/topics/solvers/materials_os_r.htm
Regards,
Arul
Hi,
What type of data do you have for the material?
What type of analysis are you trying to perform?