Meshing a hole with concentric Q8 - Nx 12

[Lumbisno]

Hello everyone, I'm learning 2D meshing for an assignment in which I have to determine de stress concentration coefficient of a part. For this I want to make a mesh that is as tidy as possible, but I'm having trouble finding how to mesh the hole so that the mesh makes a concentric pattern around it.
Any help would be appreciated, thanks!

 

[SWComposites]

What software are you using?
What have you tried?
What are the problems?
Post picture (not attachments).
Create a circular region around the hole and mesh it uniformly. Then create 8 regions (truncated pie shapes) for the rest.

 

[SWComposites]

Or Google “FEM mesh around hole”. Sheesh.

 

[Lumbisno]

I'm using Nx 12, my idea was to do the region as you suggested too, but I'm not finding a tool in the software that allows me to do this partition. The only one that I found is "divide body", but it only allows me to do partition across the centerline of the prt.
The partition I'm trying to do is:

I was also trying to modify the mesh in the FEM using mesh control and meshing the hole, but it gives me an error along the lines of "Can't find inner loop".
I have not been able to find a tutorial for this in Nx as of yet.

 

[Lumbisno]

sorry, it was not "divide body", it's "divide face"

 

[SWComposites]

Ive never used NX.
In FEMAP I would create a series of lines and arcs that define the regions to be meshed. Define the number of nodes along each line and arc. Then mesh each region bounded by 4 lines or arcs.

Basically many auto meshing codes are stupid and hard to force into what you want. Therefore have to manually do some of the steps including setting edge node numbers, spacing and gradients if needed.

 

[rb1957]

I think you're using NX12 (NSATRAN) as your FEA code. What pre-processer are you using to build your model ? FeMap ??

BTW, there is a student forum for student's questions.



"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

 

[Lumbisno]

Thank you both, I have resolved the problem, in the ".prt" file you can create a sketch with the divisions that you want, you can then use "divide face" or "divide body" to partition the body in the sections that you defined in the sketch.