FEM CalculiX/ru: Difference between revisions
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(Updating to match new version of source page) 

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<languages/> 
<languages/> 

−  +  == Preface == 

−  This page collects 
+  This page collects information on the [http://www.calculix.de/ CalculiX] finite element solver, the default solver in the [[FEM Workbench]] for structural and thermomechanical analysis as of FreeCAD 0.17. Depending on the operating system you are working with, you'll need to install CalculiX before running your first simulation. Please see [[FEM InstallFEM Install]]. 
+  The solver is able to do linear and nonlinear calculations, for static, dynamic, and thermal problems. The solver operates on an Abaqus input file ({{incode.inp}}), which means it can be used with different preprocessors that support this format. The program includes its own graphical preprocessor which, however, is not used by FreeCAD, only the solver itself. 

−  === Interface === 

⚫  
+  CalculiX is designed to run on Unix platforms like Linux and Irix computers but also on MSWindows. CalculiX was developed by engineers from MTU Aero Engines, Munich, Germany, to assist them in designing machinery such as jet turbines. The software is currently released to the public on the terms of the GPL version 2. 

−  # creates a CalculiX input file 

+  
−  # starts CalculiX application 

+  == Integration with FreeCAD == 

−  # logs the output of CalculiX and 

⚫  
⚫  
+  
+  # A CalculiX input file is created with details required to run the simulation 

+  # The CalculiX solver is started with this input file 

+  # The output from the solver is logged 

⚫  
The [[FEM SolverControlFEM Control Solver]] tool manages the whole process. User interaction in the process is possible. 
The [[FEM SolverControlFEM Control Solver]] tool manages the whole process. User interaction in the process is possible. 

−  +  == Preprocessing interface == 

−  +  The input file that CalculiX uses can be prepared and edited before the solver is started. The units used in the input file are independent of the units set in FreeCAD; they will always be millimeters (mm) and Newton (N). 

+  {{Emphasis(ToDo: check this. What happens with the mesh if inch is used in FreeCAD? As density was introduced, with this we have kg and s and no longer N?! how about this?!)}} 

⚫  
+  
⚫  
⚫  
+  
⚫  
* Tet4 and Tet10 
* Tet4 and Tet10 

* S3 and S6 
* S3 and S6 

* B31 and B32 
* B31 and B32 

−  * and 
+  * and those described in [[FEM Mesh CalculiX]] 
−  +  === Analysis === 

−  * 
+  * Linear static analysis 
* Frequency analysis 
* Frequency analysis 

−  * Coupled thermal 
+  * Coupled thermalstructural analysis 
−  
−  ===== Materials ===== 

⚫  
⚫  
−  +  === Materials === 

⚫  
⚫  
⚫  
+  == Postprocessing interface == 

⚫  
+  <div class="mwtranslatefuzzy"> 

[[Category:Poweruser_Documentation/ru]] 
[[Category:Poweruser_Documentation/ru]] 

[[Category:Developer/ru]] 
[[Category:Developer/ru]] 

+  </div> 

{{clear}} 
{{clear}} 
Revision as of 11:08, 7 April 2019
Preface
This page collects information on the CalculiX finite element solver, the default solver in the FEM Workbench for structural and thermomechanical analysis as of FreeCAD 0.17. Depending on the operating system you are working with, you'll need to install CalculiX before running your first simulation. Please see FEM Install.
The solver is able to do linear and nonlinear calculations, for static, dynamic, and thermal problems. The solver operates on an Abaqus input file (.inp
), which means it can be used with different preprocessors that support this format. The program includes its own graphical preprocessor which, however, is not used by FreeCAD, only the solver itself.
CalculiX is designed to run on Unix platforms like Linux and Irix computers but also on MSWindows. CalculiX was developed by engineers from MTU Aero Engines, Munich, Germany, to assist them in designing machinery such as jet turbines. The software is currently released to the public on the terms of the GPL version 2.
Integration with FreeCAD
Interaction between the FEM Workbench and CalculiX is done through writing and reading text files. The sequence of operations is as follows:
 A CalculiX input file is created with details required to run the simulation
 The CalculiX solver is started with this input file
 The output from the solver is logged
 The output files from the solver are read, if they are available
The FEM Control Solver tool manages the whole process. User interaction in the process is possible.
Preprocessing interface
The input file that CalculiX uses can be prepared and edited before the solver is started. The units used in the input file are independent of the units set in FreeCAD; they will always be millimeters (mm) and Newton (N).
(ToDo: check this. What happens with the mesh if inch is used in FreeCAD? As density was introduced, with this we have kg and s and no longer N?! how about this?!)
The CalculiX interface supports the following objects:
FEM Elements
 Tet4 and Tet10
 S3 and S6
 B31 and B32
 and those described in FEM Mesh CalculiX
Analysis
 Linear static analysis
 Frequency analysis
 Coupled thermalstructural analysis
Materials
 One linear elastic isotropic material (uniformity in all directions)
 Multiple material use is in development
Postprocessing interface
The FEM Workbench can read the resulting stress (Von Mises) and all displacements