In the FC preferences, section Import-Export -> INP there are 2 options that I don't understand:
- Which mesh elements to export
The tooltip states that "If Highest is selected, only the highest elements will be exported." but what is meant with "highest elements". Are there several elements the highest ones?
- Export group data
There is no tooltip and I couldn't google what this option means.
(These are the 2 open points in https://www.freecadweb.org/wiki/Preferences_Editor#INP )
Questions concerning the INP file format
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Re: Questions concerning the INP file format
select a mesh and show in poperty editor Data there is the mesh informations. If there are groups and the pref is set to export them, they are exported. Attached a rather small mesh with 10 groups. Export to *.inp and have a look at the inp files in an editor.
Re: Questions concerning the INP file format
https://github.com/FreeCAD/FreeCAD/blob ... 1296-L1305uwestoehr wrote: ↑Sun Mar 10, 2019 3:16 pm In the FC preferences, section Import-Export -> INP there are 2 options that I don't understand:
- Which mesh elements to export
The tooltip states that "If Highest is selected, only the highest elements will be exported." but what is meant with "highest elements". Are there several elements the highest ones?
the standard mesh process for a solid mesh is as follows:
- mesh the edges, save these elements
- mesh the shell, save these elements
- mehs the solid, save these elements
means a solid mesh has edge, shell and volume elements. Select the mesh from 3D FEM cantilever example, right click mesh informations.
For the analysis of a solid mesh only the solid mesh elements are needed. All would export Edge, Shell and Volume elements. Highest would only export the highest order, means Volumes for a Volume mesh and Faces for a Shell mesh. FEM was implemented for mixed meshes it export the following elements: only edges not belonging to faces and faces not belonging to volumes
See https://github.com/FreeCAD/FreeCAD/blob ... 1296-L1305
BUT the FEM is nearly useless ... It is easy possible to have an mixed mesh in which a edge which belongs to a face is needed for an edge too. A simple example is a slab the a beam or pretension. The slab is modelled with a shell elements and the beam (pre tension) with edge elements. These edges belong to the face of the slab.
Any way the FEM was really helpful when I started to implement the mixed mesh analyis, which is not finished because of the described export problem.
Bernd
Re: Questions concerning the INP file format
We might should rename or deactivate the option?bernd wrote: ↑Mon Mar 11, 2019 3:43 pm
BUT the FEM is nearly useless ... It is easy possible to have an mixed mesh in which a edge which belongs to a face is needed for an edge too. A simple example is a slab the a beam or pretension. The slab is modelled with a shell elements and the beam (pre tension) with edge elements. These edges belong to the face of the slab.
Any way the FEM was really helpful when I started to implement the mixed mesh analyis, which is not finished because of the described export problem.
Re: Questions concerning the INP file format
Thank you. This is now described.
While playing around with the latest FC Conda build I got this error when applying a material:
Code: Select all
Traceback (most recent call last):
File "C:\FreeCAD\FreeCAD_0.18.16078_Conda_Py3QT5-WinVS2015_x64\Mod\Fem\femguiobjects\_ViewProviderFemMaterial.py", line 219, in choose_material
self.set_mat_params_in_input_fields(self.material)
File "C:\FreeCAD\FreeCAD_0.18.16078_Conda_Py3QT5-WinVS2015_x64\Mod\Fem\femguiobjects\_ViewProviderFemMaterial.py", line 509, in set_mat_params_in_input_fields
self.parameterWidget.spinBox_poisson_ratio.setValue(float(matmap['PoissonRatio']))
OS: Windows 7
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.16078 (Git)
Build type: Release
Branch: master
Hash: 67df9f3a828fbb0fec29d039792d4baf3d9ee8e0
Python version: 3.6.6
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: German/Germany (de_DE)
Re: Questions concerning the INP file format
Re: Questions concerning the INP file format
It is not that the options does not change anything. It is just it is not as useful as asumed when it was implemented. Furthermore the name FEM ist not a good name. I will think of something better in 0.19. Feel free to make a FEM bug report and assign it to me.