FEM: Unidentified CalculiX error when applying a rigid body constraint to an edge/vertex

[FEA-eng]

FEM: Unidentified CalculiX error when applying a rigid body constraint to an edge/vertex

[marioalexis84]

On my system there is no error but no result (.frd file is empty).
The CalculiX documentation says:

If the participating nodes in a rigid body definition lie on a straight line,
the rigid body rotation about the line is not defined and an error will occur.
To remove the rotational degree of freedom, specify that the rotation about the
axis is zero

Effectively, removing the rotational degree of freedom generates the result.

[FEA-eng]

@marioalexis84 Ok, right, thanks. I'll update the documentation then. The same seems to be true for vertices (the ccx manual doesn't cover it though so I'm not sure how to describe which DOF needs to be fixed but in any case, it also depends on the location of the RED NODE). I guess the issue can be closed then, right?

[marioalexis84]

yes, it can be closed

[FEA-eng]

Ok, closing. I just wonder why it worked with standalone CalculiX. Maybe this limitation was fixed without notice in the newest version or it’s another case of inconsistent behavior of CalculiX.

[marioalexis84]

I just wonder why it worked with standalone CalculiX

It's hard to say without debugging CalculiX properly. The documentation says "an error will occur" but is not very specific about the error.
I'm using calculix 2.21 and 2.20 on Linux and it doesn't work.
It seems to be some kind of undefined behavior: one system raises an error, another doesn't complain, and another fails without an error.