Problem with model import into FEM analysis

About the development of the FEM module/workbench.

Moderator: bernd

felx325
Posts: 4
Joined: Wed Oct 17, 2018 7:58 pm

Problem with model import into FEM analysis

Postby felx325 » Wed Oct 17, 2018 8:07 pm

Hello I haven't found a similar problem and not too much information regarding FEM in FreeCad. I want to make an analysis based on a model designed in Sketchup, so I followed this steps:

1- Export model to STL file
2- Import model into GMSH and convert to INP file
3- Open FreeCad and create a new file
4- Import the new INP model into the FEM workbench
5- Create the Analysis and SolidMaterial

Here is where I get stuck, and I don't know what else to do; the moment I select a FEM constraint for a fixed... the model disappears. Any other force and it also disappears.

Is there any reliable way to get a model to FreeCad for FEM analysis? I don't want to make the model again in FreeCad...

Best, Felipe.

PS: Sorry for bad english if so.
chrisb
Posts: 14001
Joined: Tue Mar 17, 2015 9:14 am

Re: Problem with model import into FEM analysis

Postby chrisb » Wed Oct 17, 2018 8:47 pm

Moved to FEM forum.
Jee-Bee
Posts: 1601
Joined: Tue Jun 16, 2015 10:32 am
Location: Netherlands

Re: Problem with model import into FEM analysis

Postby Jee-Bee » Thu Oct 18, 2018 5:15 am

Your'e problem is because of the way the FEM workbench work...
The fem workbench is only able set constraints on solid material and not nodes (read meshes).
The most easy workflow for you is to import to stl file. go to the part workbench and that convert mesh to solid.
(https://www.freecadweb.org/wiki/Part_ShapeFromMesh)
If it is a simple model it don't that that long. otherwise you have to be patient or re do the work in FreeCAD...
User avatar
bernd
Posts: 7038
Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland

Re: Problem with model import into FEM analysis

Postby bernd » Thu Oct 18, 2018 6:15 pm

+1 to Jee-Bee

@felx325
if you would post an example stl we may help you to set up an analysis.
felx325
Posts: 4
Joined: Wed Oct 17, 2018 7:58 pm

Re: Problem with model import into FEM analysis

Postby felx325 » Fri Oct 19, 2018 3:55 pm

Couldn't make it work so finally I'll design the model again in FreeCad as tedious as it will be.

Thanks anyways! Best, Phil.