Abaqus writer, write group data

[bernd]

Lately I did extend the Abaqus writer. It is possible to write mesh groups to inp file. Once the PR is in master https://github.com/FreeCAD/FreeCAD/pull/1111 it works as follows ...

by Python:

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# reads the params from import/export preference GUI
App.ActiveDocument.FEMMeshGmsh.FemMesh.write('/home/hugo/Desktop/groups/femmeshgroups2esets2.inp')

# uses the prefs passed with the method
App.ActiveDocument.FEMMeshGmsh.FemMesh.writeABAQUS('/home/hugo/Desktop/groups/femmeshgroups2esets2.inp', 0, True)

''' while
elemParam:
0 = all elements
1 = highest elements only
2 = FEM elements only (only edges not belonging to faces and faces not belonging to volumes)

groupParam:
true = write group data
false = do not write group data
'''

On Gui just make your import/export prefs and export a mesh to inp.

example file attached ...

[HarryvL]

Hi Bernd, this is a great feature. I plan to use it in CGX to review stress results in (hidden) Mesh regions of interest. Would it be possible to also export all group data to the CCX INP at the point of clicking "Write .inp file" before starting a CalculiX analysis? That saves me manually merging CCX input files. Thanks, Harry

[HarryvL]

Sorry Bernd, I think this is not as easy as I imagined. After trying *NODE FILE, NSET=Nset_name and *EL FILE, NSET=Nset_name (where Nset_name is a node set exported by FreeCAD) I found that you can only toggle a region in the CGX pre-processor (plot n Nset_name) and not the post-processor. Results are only shown for NSET, but the mesh for all other nodes stays visible (see below). Things become even more complicated when CCX introduces new nodes (OUTPUT=3D).

RHS_1.png (47.07 KiB) Viewed 1959 times

So from a CGX point of view there is not much justification for writing mesh regions to INP

Harry

[fandaL]

Sorry Bernd, I think this is not as easy as I imagined. After trying *NODE FILE, NSET=Nset_name and *EL FILE, NSET=Nset_name (where Nset_name is a node set exported by FreeCAD) I found that you can only toggle a region in the CGX pre-processor (plot n Nset_name) and not the post-processor. Results are only shown for NSET, but the mesh for all other nodes stays visible (see below). Things become even more complicated when CCX introduces new nodes (OUTPUT=3D).
RHS_1.png
So from a CGX point of view there is not much justification for writing mesh regions to INP

open frd file in cgx
read inp file sets from input file by

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read job_name.inp nom

display nsets and elsets by

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prnt se

plot desired elset by e.g.

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plot e SolidMaterialSolid

use gui to plot stresses or so
You can farther look at cgx manual or to examples at https://github.com/mkraska/CalculiX-Examples

[HarryvL]

Thanks fandaL, exactly what I needed

RHS_detail.png (24.25 KiB) Viewed 1939 times

[bernd]

HarryvL this should not be to difficault to add as a pref. I will have a look when I have a minute.

bernd

[bernd]

you can change this easily yourself for any analysis CalculiX inputfile writing by replaceing the False by a True in the file Mod/Fem/femsolver/calculix/writer.py in your Mod folder of FreeCAD.

https://github.com/FreeCAD/FreeCAD/blob ... ter.py#L81

to find the Mod folder you can put in this in your FreeCAD python console:

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FreeCAD.ConfigGet("UserAppData")

Bernd

[HarryvL]

Great, thanks