Hi,

I'll like to know if there is a way to do a 2D-axisymmetric analysis with FreeCAD and Calculix through the FEM workbench ?

**Moderator:** bernd

Hi,

I'll like to know if there is a way to do a 2D-axisymmetric analysis with FreeCAD and Calculix through the FEM workbench ?

I'll like to know if there is a way to do a 2D-axisymmetric analysis with FreeCAD and Calculix through the FEM workbench ?

CalculiX can do it so after modifying inp file from FreeCAD, you could get it working. Maybe this can help for the beginning:

Create a 2D model in xy plane where y is the axis of symmetry, as if you are making shell analysis, but do not constraint nodal rotations.

Write inp file, modify element type, e.g.

and change SHELL SECTION to SOLID SECTION, e.g.

According to the manual https://www.feacluster.com/CalculiX/ccx ... ode54.html , loads in the plane should have size as if they are acting on the whole circumference.

Create a 2D model in xy plane where y is the axis of symmetry, as if you are making shell analysis, but do not constraint nodal rotations.

Write inp file, modify element type, e.g.

Code: Select all

```
*Element, TYPE=S6, ELSET=Efaces
** change to axisymmetric type:
*Element, TYPE=CAX6, ELSET=Efaces
```

Code: Select all

```
*SHELL SECTION, ELSET=SolidMaterialElementGeometry2D, MATERIAL=SolidMaterial
20
** change to:
*SOLID SECTION, ELSET=SolidMaterialElementGeometry2D, MATERIAL=SolidMaterial
```

Hello,

Any chances to get it work on a 3D analysis on a complex geometry ?

I'm trying to modelize the stresses in the welds between the hub and the flanges of a gear wheel of about 4 meters diameter, so the number of nodes if more than 5 millions, and Calculix goes outrange.

As it is a axisymmetric shape, the good solution would be the cut it in 8 and to apply symmetry on the cutted faces. But I don't find any example of such apllication on freecad FEM. Do you know if there is a trick, or if there are any ongoing developments ?

Thanks,

Jonathan

Any chances to get it work on a 3D analysis on a complex geometry ?

I'm trying to modelize the stresses in the welds between the hub and the flanges of a gear wheel of about 4 meters diameter, so the number of nodes if more than 5 millions, and Calculix goes outrange.

As it is a axisymmetric shape, the good solution would be the cut it in 8 and to apply symmetry on the cutted faces. But I don't find any example of such apllication on freecad FEM. Do you know if there is a trick, or if there are any ongoing developments ?

Thanks,

Jonathan

you need this function

https://www.feacluster.com/CalculiX/ccx ... de231.html

i think you can create 1/8 of the model.

create some constraints so you can find it back in the files.

and modifie it as in the example

https://www.feacluster.com/CalculiX/ccx ... de231.html

i think you can create 1/8 of the model.

create some constraints so you can find it back in the files.

and modifie it as in the example