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  1. Emir Yasin Oztekin

    Nastran 3D orthotropic Material

    I am trying to create 3d orthotropic material for composite solid elements.First question C23 semms right in patran interface when i look into stiffness matrix but C23 changes in exported bdf. My second question is Nastran takes C44=G12, C55=G23 and C66=G31 but in composite material books it is...

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