FEM object types

About the development of the FEM module/workbench.

Moderator: bernd

User avatar
HarryvL
Posts: 1071
Joined: Sat Jan 06, 2018 7:38 pm
Location: Netherlands

Re: FEM object types

Postby HarryvL » Sun Apr 01, 2018 6:16 am

It appears to be more fundamental, because I get the same when trying to combining 2 simple blocks. "Shape splitting tools" is greyed-out and when using Part>Split>Boolean Fragments I get an error message:


BooleanFragments.png
BooleanFragments.png (45.27 KiB) Viewed 436 times


Clearly the absence of OCC 6.9.0 is the problem, but I neither know what it means, nor do I know why it is absent.
User avatar
bernd
Posts: 9823
Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland

Re: FEM object types

Postby bernd » Sun Apr 01, 2018 6:50 am

because your ubuntu has an older version of occt. What you could do is compile occt yourself. It is on 7.2 allready. There are various topics araound to occt. If you are able to compile FreeCAD it is simple to compile occt too.

If you use ppa newer version of occt was use to compile.

Ahh probably ready packages are available too, there have been disscusdions around. You may ask in instatallation part of the forum.

Ahh you may use ppa to create geometry and just do the FEM part with my branch.

A few possibilities ...
User avatar
HarryvL
Posts: 1071
Joined: Sat Jan 06, 2018 7:38 pm
Location: Netherlands

Re: FEM object types

Postby HarryvL » Sun Apr 01, 2018 7:57 am

:oops: Thanks
User avatar
HarryvL
Posts: 1071
Joined: Sat Jan 06, 2018 7:38 pm
Location: Netherlands

Re: FEM object types

Postby HarryvL » Sun Apr 01, 2018 3:28 pm

Got so far as to write INP file. All nodes are exported as expected (including those for the 2 beams and the plate - see CGX plot), but only the TYPE=C3D10 elements (see INP, renamed TXT)?

MM_Test1_CGX_Nall_.png
MM_Test1_CGX_Nall_.png (13.1 KiB) Viewed 410 times

FEMMeshGmsh .txt
(5.59 KiB) Downloaded 22 times
TestMM_1.fcstd
(15.09 KiB) Downloaded 21 times
User avatar
HarryvL
Posts: 1071
Joined: Sat Jan 06, 2018 7:38 pm
Location: Netherlands

Re: FEM object types

Postby HarryvL » Sun Apr 01, 2018 6:54 pm

And when I test a case with Faces and lines only:

TestMM_2.png
TestMM_2.png (269.4 KiB) Viewed 403 times

Then all nodes get exported, but this time only the TYPE=S6 elements get written to INP:

MM_Test2_CGX_Nall_.png
MM_Test2_CGX_Nall_.png (11.2 KiB) Viewed 403 times

So a pattern emerges?

I have looked for the code where the INP gets written, but without success. I still struggle to find my way around.

FEMMeshGmsh.txt
(4.79 KiB) Downloaded 21 times
User avatar
bernd
Posts: 9823
Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland

Re: FEM object types

Postby bernd » Sun Apr 01, 2018 9:00 pm

would you post yoir FreeCAD file?
User avatar
HarryvL
Posts: 1071
Joined: Sat Jan 06, 2018 7:38 pm
Location: Netherlands

Re: FEM object types

Postby HarryvL » Sun Apr 01, 2018 9:10 pm

TestMM_2.fcstd
(19.3 KiB) Downloaded 17 times
User avatar
bernd
Posts: 9823
Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland

Re: FEM object types

Postby bernd » Tue Apr 03, 2018 4:25 am

multimaterial is not implemented for mixedmeshes. Find the file attached ...

TestMM_2_bhb1.fcstd
(48.5 KiB) Downloaded 20 times

Screenshot_20180403_062333.png
Screenshot_20180403_062333.png (457.83 KiB) Viewed 364 times
User avatar
bernd
Posts: 9823
Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland

Re: FEM object types

Postby bernd » Tue Apr 03, 2018 4:27 am

User avatar
HarryvL
Posts: 1071
Joined: Sat Jan 06, 2018 7:38 pm
Location: Netherlands

Re: FEM object types

Postby HarryvL » Tue Apr 03, 2018 5:15 am

Thanks Bernd, does that mean that if I use a single material all element types get exported?