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Error. Nodes defined out of topological

Valued Contributor
Valued Contributor

Hello.

When creating a contact between the nodes and solid elements, an error occurs:
  Error Writing Connection Region 2. Nodes defined out of topological order or branching.

How to avoid it?

 

 


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1 REPLY

Re: Error. Nodes defined out of topological

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Dear Cfytrr,

This is a typical error when defining edge source regions: branching is not allowed!!. The NX NASTRAN requirement for the edge region is that the list of nodes should be consecutive, continuous, in the case of a loop the starting node will be the end node as well. If you have a branch, ie, a T-region like, and you select all the nodes of the "T" region, then the order is not continuos, you have a branching.

 

The solution:

  • in the case of a "T" like edges you need to define a minimum of TWO SOURCE REGIONS, one for the wedge and another region for the flange.
  • in the case of a "double-T" like edges you need to define a minimum of THREE SOURCE REGIONS, a region for each flange (in total two) and another one for the wedge, etc..
  • Alternatively, in the case of a "double-T" like edges you can define a region selecting the "C-like" edges and another two regions for each half flange, understood?.

Also, is critical to name SOURCE region to the edge-based region, and TARGET the "surface" region. Run this way and you will success defining a GLUE EDGE-TO-FACE condition with FEMAP & NX Nastran.

Best regards,

Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director
IBERISA • 48004 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog Femap-NX Nastran: http://iberisa.wordpress.com/