When creating a solid, I always get the message "Boundary surfaces are not closed at edges ..." What should I do?


This is often caused by the fact that one or more surfaces of the generated solid have double lines. In this case, the boundary surfaces of the solid are not closed and the generation has to be interrupted. In order to quickly find these lines, the program displays the corresponding message.


You can quickly find the double lines by using the feature "Tools → Model Check → Overlapping Lines." In this tool, you can also display the line pairs as an Excel list or create partial views (see the highlighted buttons in Figure 02).

However, it is often not easy to delete the lines as they are assigned to different objects. If you delete one of the lines, a surface will also be deleted, for example. Therefore, you should first check for all structural components whether the lines can be deleted, and change the boundary lines, if necessary.


Boundary surface Error solids Double line



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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