When using line releases, I get an error that the definition of the release is not unique. What does that mean?


Line releases are defined by an additional line that is generated by the software. The theoretical background of line releases is described in a Knowledge Base article.

For a detailed explanation of that error, see the model file attached to this FAQ. For the line release no. 3 a definition node has to be set: If the software generated an additional virtual node, surface 2 would be destroyed.

Imagine the following scenario:

You have four surfaces 1, 2, 10, 14 (see Figure 02). When you define a line release to line 3, it will look as seen in Figure 03. As surface 2 would be destroyed by that (as line 6 is the same for surface 2 and 14), line 6 has to start at node 3 and at the generated node (see Figure 04).

This is where you need the definition node. If it is missing, the software creates that error.


Line release Line hinge Unique



Contact us

Did you find your question?
If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

+49 9673 9203 0


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

Price of First License
3,540.00 USD