Greetings group,
I have an issue with 2 plates connected with kinematic coupling from the same reference node. When i apply explicit displacement to the ref. node, the displacement applies only to 1 plate.
Any suggestions? is something wrong with the setup, or just a bug?
The problem is 2D plane stress problem.
The model is available in the link below (too big to be attached here.)
Thanks in advance for the help
Coupling constraints in CalculiX may not work well with shells, and kinematic coupling needs a node-based surface to work with them:
Yes i confirm, connect node-based surfaces and ref. node with coupling constrain and problem solved!. Thank you so much 
Since node-based surfaces can also be used by solids, maybe all kinematic couplings should use node-based surfaces instead of element-based?
It definitely makes sense, but I still hope for some feedback from the CalculiX community. According to the manual, element-based surfaces should be used:
With SURFACE the nodes are selected to which the constraint applies (so-called coupling nodes). This surface must be face-based.
With this keyword kinematic constraints can be established between each node belonging to an element surface and a reference node.
So there might be some issues/limitations of this approach with node-based surfaces. I think I’ll just ask Guido directly.
The 3D analog of yesterday’s problem in the below link. It seems, the element-based surface works fine with kinematic coupling for 3D case.
Yes, there’s a problem with kinematic couplings only when using them with shells.
