## FEM Reinforcement Results Comparing FreeCAD to Code Aster

About the development of the FEM module/workbench.

Moderator: bernd

hhassey
Posts: 160
Joined: Thu Jun 04, 2015 8:01 pm

### FEM Reinforcement Results Comparing FreeCAD to Code Aster

As I promised I ran a the FreeCAD Reinforcement RC Wall 2D example in Code Aster to compare the results. I hope this effort is useful for someone.

First I need to point out the following things:
• Of course both have the same geometry, same mesh, loading and boundary conditions.
• The Reinforced Material used in FreeCAD was made out of Concrete-EN-C35/45 for the matrix and Reinforcement-FIB-B500 for the steel.
I was expecting the concrete to have a compressive strength of 30 MPA or 45MPA to my surprise it was set at 15.75 MPA (maybe someone should revise this number)
• Second, in Code Aster. There are far more parameters to use, there is a safety factor for the steel stress and one for the concrete stress, I set both to 1.
• Code aster calculates two layers of steel i.e Upper and lower steel. over the thickness of the shell, in this case both have the same stress and thus both results in code aster need to be added.
• Code aster reports it's reinforcement in m2 / m so in order to compare to the Reinforcement Ratio of FreeCAD I had to divide Code Aster result by 0.15m (the thickness of the shell)
Here are the Results:
FreeCAD Reinforcement.jpg (39.81 KiB) Viewed 772 times
Code-Aster:
Aster Reinforcement.jpg (60.07 KiB) Viewed 772 times
bernd
Posts: 10956
Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland

### Re: FEM Reinforcement Results Comparing FreeCAD to Code Aster

the colorbars seam sligthly different, but the result values seam equal ...
bernd
Posts: 10956
Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland

### Re: FEM Reinforcement Results Comparing FreeCAD to Code Aster

did you use the same mesh for both?
hhassey
Posts: 160
Joined: Thu Jun 04, 2015 8:01 pm

### Re: FEM Reinforcement Results Comparing FreeCAD to Code Aster

bernd wrote:
Thu Aug 06, 2020 3:56 am
the colorbars seam sligthly different, but the result values seam equal ...
That was the most similar I could find in CA.

And yes, I used the same mesh on both cases.
bernd
Posts: 10956
Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland

### Re: FEM Reinforcement Results Comparing FreeCAD to Code Aster

Since the same mesh was used, the nodal values could compared as well. Is it possible to print nodal values out of code aster? With an export from FreeCAD to Paraview this should be possible from FreeCAD side.
hhassey
Posts: 160
Joined: Thu Jun 04, 2015 8:01 pm

### Re: FEM Reinforcement Results Comparing FreeCAD to Code Aster

Can you outline the process of exporting from FreeCAD to Paraview?
david69
Posts: 368
Joined: Wed Jan 01, 2014 7:48 pm

### Re: FEM Reinforcement Results Comparing FreeCAD to Code Aster

hhassey
Posts: 160
Joined: Thu Jun 04, 2015 8:01 pm

### Re: FEM Reinforcement Results Comparing FreeCAD to Code Aster

Here are the calculated displacements.

Displacement_Fc.png (54.16 KiB) Viewed 638 times

Code-Aster:
Displacement_ca.png (49.62 KiB) Viewed 638 times
bernd
Posts: 10956
Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland

### Re: FEM Reinforcement Results Comparing FreeCAD to Code Aster

hhassey wrote:
Thu Aug 06, 2020 6:20 pm
Can you outline the process of exporting from FreeCAD to Paraview?
- In FEM workbench
- select the std FEM Result object
- Menue File --> export --> file typ --> FEM result VTK --> put in a name and press ok
- open the exported vtk file in Paraview
bernd
Posts: 10956
Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland

### Re: FEM Reinforcement Results Comparing FreeCAD to Code Aster

seams we (HarryvL) did a good job ... He was the one who initially developed the reinforcement force calculation.

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