Nodes missing in .BDF / TET10

[jens.hornschuh]

Hi There,

When useing Nastran INCAD 2019 (13.2.0.168), I face the issue, that CTETRA elements (TET10) are not properly written to the corresponding .bdf file, which we would like to postprocess in a "real" patran/nastran environment.

The attached screenshot shows the trouble:

In file .nas (left side of the picture), all CTETRA elements have 10 assinged nodes (as it should be), whereas the corresponding .bdf (right side of the picture) only has either 9 nodes (red circled) or even 7 nodes assigned (blue circled). => this goes on for the following TET elements but I only highlighted the first two.

Any idea? Thanks and a happy new year to all of you 🙂

[John_Holtz]

Hi @jens.hornschuh 

How are you creating the BDF file?

[jens.hornschuh]

Dear John,



thank you for your reply.



I allowed TRSLDFGMDATA and TRSLMODLDATA (=ON) by editing the parameters at the bottom of the model tree to obtain the output files.



[cid:[email protected]]

[John_Holtz]

Hi @jens.hornschuh 

I have reproduced the behavior, so I will report it.

In my test model, it appears that the midside nodes that are involved in the contact between parts are missing from the BDF file. I have no idea why that would happen or if there is some way to prevent it from happening. (Now that I write that, changing the parameter ENHCCONTACTRSLT to ON may fix the problem, and then re-run the analysis.)

The other option is to copy the CTETRA lines from the .nas file to the .bdf file. The node numbers are not going to change!