Unwanted merging of nodes

Question

Unwanted merging of nodes

(OP)

25 Jun 24 14:08

When I mesh multiple surfaces at the same time, FEMAP automatically merges nodes that are close as shown in the image, which i do not want. If I mesh them individually, there is no problem and the surfaces mesh as expected. Does anyone have an explanation for this? Is there a setting/button I need to uncheck.

https://files.engineering.com/getfile.aspx?folder=25ebb85f-35af-43dc-9021-1

SWComposites (Aerospace) · Answer 1 · 2024-06-25 14:17:06

I vaguely recall there is a parameter setting that defines the distance over which nodes are merged.

WorcesterSorcerer (Mechanical) · Answer 2 · 2024-06-25 14:30:29

@SWComposites Thanks - i'm not actively merging the nodes (i.e. checking coincident elements) . FEMAP is doing it of its own accord....

SWComposites (Aerospace) · Answer 3 · 2024-06-25 14:46:57

Yes, I know that. There should be a setting to control the auto merging. I don't have a copy of FEMAP anymore so can't check it directly.

putting "femap auto merging nodes distance" into google comes up with a bunch of info.

WorcesterSorcerer (Mechanical) · Answer 4 · 2024-06-25 14:50:56

Ah ! Thank you @SWComposites - you are a legend.

My model has tiny parts that are 50m apart - I just googled what you suggested and the penny dropped!:

"Femap determines the default node merge tolerance based on overall model size. The number is 1/10000 of the model box diagonal (think of the model box being an invisible box that completely encapsulates every entity in the model)."

Thank you thank you - you've saved me a lot of graft lol

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Unwanted merging of nodes