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by aomanchuria
Fri Apr 09, 2021 12:04 am
Forum: FEM
Topic: Status of "Rotations are only valid for Beam and Shell elements" issue
Replies: 8
Views: 378

Re: Status of "Rotations are only valid for Beam and Shell elements" issue

for example this simple beam loading. the bottom is fixed, the top is where I would like to add some kind of moment, I apply 0.5mm displacement in the two plane directions and I get the same as if I applied 0.5mm plus a rotation of 45degrees, exactly the same image, the 45 degrees doesn't even come ...
by aomanchuria
Thu Apr 08, 2021 6:53 pm
Forum: FEM
Topic: Status of "Rotations are only valid for Beam and Shell elements" issue
Replies: 8
Views: 378

Re: Status of "Rotations are only valid for Beam and Shell elements" issue

I thought the displacement constraint allowed one to allow movement in only one axis so that you could use it as a sliding constraint. but then you are right, the pivoting constraint is missing. But again it seems to be a Calculix limitation. some how one has to work around it
by aomanchuria
Wed Apr 07, 2021 9:59 pm
Forum: FEM
Topic: Status of "Rotations are only valid for Beam and Shell elements" issue
Replies: 8
Views: 378

Re: Status of "Rotations are only valid for Beam and Shell elements" issue

using the inp editor from launcher3.4 it looks like this is a limitation existing in Calculix

** directions <dir> can be 1,2,3 for bodies
** and 1 to 6 for shells and beams (4,5,6 - to fix rotation)
**
*BOUNDARY
<nod.group>,<dir>,<dir>,<value>

** repeat last line, if needed
by aomanchuria
Wed Apr 07, 2021 9:46 pm
Forum: FEM
Topic: Status of "Rotations are only valid for Beam and Shell elements" issue
Replies: 8
Views: 378

Status of "Rotations are only valid for Beam and Shell elements" issue

Yesterday I realized that I could not actually apply a moment force or a displacement rotation by an angle via FreeCAD. What's the current .inp file workaround? What's the status on implementing that? I read several posts about it and they are now like a year old or older. from what I gather there w...
by aomanchuria
Sat Mar 27, 2021 2:41 pm
Forum: FEM
Topic: Geo file missing *Tie Master/Slave Surfaces
Replies: 4
Views: 182

Re: Geo file missing *Tie Master/Slave Surfaces

Well it's not like that. I noticed how FreeCAD takes ages to export files. GMSH knows about surfaces because FreeCAD puts together the geo files surface names and associated surface ids. Literally the master and slave surfaces are there in the file already. All FreeCAD has to do is to rename the vir...
by aomanchuria
Fri Mar 26, 2021 10:05 pm
Forum: FEM
Topic: Geo file missing *Tie Master/Slave Surfaces
Replies: 4
Views: 182

Re: Geo file missing *Tie Master/Slave Surfaces

It would be nice to have a button from FreeCAD FEM MESH by GMSH that was "EXPORT GEO file only" So that I then could modify the GEO file independently.
by aomanchuria
Fri Mar 26, 2021 9:50 pm
Forum: FEM
Topic: Geo file missing *Tie Master/Slave Surfaces
Replies: 4
Views: 182

Re: Geo file missing *Tie Master/Slave Surfaces

Yup, I think I understand my own question: *TIE, POSITION TOLERANCE=0.1, ADJUST=NO, NAME=TIEConstraintTie007 TIE_DEPConstraintTie007,TIE_INDConstraintTie007 those two "surfaces" are not defined independently in the GMSH file You will find TIEConstraintTie007, but not TIE_DEPConstraintTie007 or TIE_I...
by aomanchuria
Fri Mar 26, 2021 9:35 pm
Forum: FEM
Topic: Geo file missing *Tie Master/Slave Surfaces
Replies: 4
Views: 182

Geo file missing *Tie Master/Slave Surfaces

Looking at shape2mesh.geo for a model, I noticed that the Constraint Tie from 000- 007 in this case should also have a surface defined per the *TIE in ccx_2.17: First line: • *TIE • enter any parameters, if needed. Following line: • Name of the slave surface. • Name of the master surface. Example: *...
by aomanchuria
Mon Mar 22, 2021 5:45 pm
Forum: FEM
Topic: Compressing an o-ring. Setup
Replies: 3
Views: 196

Re: Compressing an o-ring. Setup

No, that didn't fix the problem. I try a few more things.
by aomanchuria
Mon Mar 22, 2021 5:17 pm
Forum: FEM
Topic: Compressing an o-ring. Setup
Replies: 3
Views: 196

Re: Compressing an o-ring. Setup

Oh yes, I missed that. On that face the rotations, X and Z were fixed. I'm running it now with X and Y free, Z and rotations fixed. I still don't think it will converge. The top of the o-ring has an overlapping section which I had previously used as a way to constrain it. but I've since changed to a...

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