FEM CalculiX
Introduction
Cette page rassemble toutes les informations sur le solveur actuel utilisé dans le FEM Module de FreeCAD. Les interfaces entre les solveurs et FreeCAD en pre et post processing sont aussi décrites. Pour le moment (Début 2016 et FreeCAD 0.16dev) le seul solveur supporté par le module FEM est [CalculiX]. Selon le système d'exploitation utilisé vous aurez besoin d'installer CalculiX d'abord. Page [FEM Install].
Interface
Interaction between FEM Module and CalculiX is done by text files. The FEM Module writes a CalculiX input file, starts CalculiX, logs the output of CalculiX and read the output files of CalculiX if they are available. The FEM_Calculation tool manages the whole process. User interaction in the process is possible.
Preprocessing interface
CalculiX uses abaqus input file format. The input file could be edited before the solver is started. The units used in the CalculiX input file are independet from the units used in FreeCAD. They will be mm and N. (ToDo: check this. What happens with the mesh if inch is used in FreeCAD. Density was introduced. With this we have kg and s and no longer N?! how about this !?!)
The FEM Module - CalculiX interface supports the following objects:
FEM Elements
- Tet4 and Tet10
- S3 and S6
- B31 and B32
- see FEM_Mesh_CalculiX
Analysis
- linear static analysis
Materials
- one linear elastic isotropic (uniformity in all directions) material
- multiple material is in development
Postprocessing interface
read resulting stress (Von Mises) and all displacement