Hello everyone,

I would like to perform an FE analysis with CalculiX for a geometry consisting of two rings (upper and lower) and between them a series of beams placed every 18°. So, one option would be to model a 3D sector (18°) with cyclic boundary condition. However, due to project specifications, I have to create the model in 2D. Then I would like to model the rings with CAX8 elements and the beam with B32 element.

My question is the following. **Is it possible to perform such a quasi-axisymmetric analysis and specify that there is a cycle symmetry (the beam repeats every 18°)?** I read in the documentation (CAX8 section) that it was possible to model quasi-axisymmetric structures with combination of axisymmetric elements with plane stress elements, and for example model a circular disk with holes along the circumference. However, I don’t think I could apply the method in my case. It is also mentioned the case of springs connected to axisymmetric elements (which seems close enough to my case), but no example or additional information that could help me.

If you have any examples or indications that could help, it would be very appreciated.

Thank you.

Regards,

Luca