How to output element stiffness matrix to ASCII file in Optistruct

Hi Anoop,

Please try using the OUTPUT,MATRIX card (OUTPUT,MATRIX,REDUCED if reduced format is desired) to obtain the mass and stiffness matrices in ASCII format.

Thank you very much,

Robinson

Hi Anoop,

Please try using the OUTPUT,MATRIX card (OUTPUT,MATRIX,REDUCED if reduced format is desired) to obtain the mass and stiffness matrices in ASCII format.

Thank you very much,

Robinson

https://help.altair.com/hwsolvers/os/topics/solvers/os/output_io_r.htm?zoom_highlight=output+matrxi

Thank you @Robinson Ferrari, your suggestion worked.

Hi Anoop,

Please try using the OUTPUT,MATRIX card (OUTPUT,MATRIX,REDUCED if reduced format is desired) to obtain the mass and stiffness matrices in ASCII format.

Thank you very much,

Robinson

Dear Robinson,

I am using, successfully, the OUTPUT,MATRIX,FULL,SPARSE to output the stiffness and mass matrices, however, when it comes to the mass matrix, it omits the rotational inertia of the nodes that have 6DoF (corresponding to shell elements). Do you have any idea why this is happening and/or how to solve it? 

Thank you very much.

Best regards,

Pedro Millan