My model includes members and surfaces/solids made of wood. I have already created the orthotropic material model 2D/3D. Now, I receive the error message saying that the material model for the cross-section X must be isotropic.


In this case, the orthotropic material model is probably assigned to both the surfaces/solids and the members. However, timber members require an isotropic material model. Therefore, it is necessary to create another timber material and assigned it to the corresponding members or cross-sections.


Material Material model Isotropic Orthotropic Cross-section Error

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RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

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