Different coupling constraints and their limitations

[Calc_em]

Here’s some information about that:

Nlgeom and Kinematic Coupling

Hi! I noticed that analyses with nlgeom have difficulty when kinematic coupling is involved. Now also seeing it for a relatively simple model. [image] It’s a rectangular beam profile, meshed with S8R quadratic shell elements, in bending. At both ends, a surface (type=node) is kinematically coupled with a reference point to which BCs are applied. Without nlgeom, it runs in a second and shows a reasonable result. But with nlgeom, the simulation fails. Since I’m going to more complex (shell) s…

Distributing coupling constraints

Dear all, Does CalculiX support geometric nonlinearity for distributing coupling constraints or dcoup3d element, thanks!