FEM tutorial: Difference between revisions
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=== Requirements === <!--T:10--> |
=== Requirements === <!--T:10--> |
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* For working with FreeCADs [[FEM_Module]] it is '''STONGLY''' recommended to use version 0.16 or above. |
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* The use of FreeCADs [[FEM_Module]] requires the installation of some external software. Check [[FEM_Install]] for further install instructions. |
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* [http://sourceforge.net/projects/netgen-mesher/ Netgen] and/or [http://geuz.org/gmsh/ GMSH] is installed on the system |
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* In the case of GMSH, installation of [https://github.com/psicofil/Macros_FreeCAD psicofil's macro] is recommended |
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* [http://www.calculix.de/ Calculix] is installed on the system |
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* The reader has the basic knowledge to use the Part and PartDesign Workbenches |
* The reader has the basic knowledge to use the Part and PartDesign Workbenches |
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Revision as of 06:23, 1 February 2016
Tutorial |
Topic |
---|
{{{Topic}}} |
Level |
Beginner |
Time to complete |
10 minutes + Solver time |
Authors |
Drei |
FreeCAD version |
0.16 or above |
Example files |
See also |
None |
Introduction
This tutorial is meant to introduce the reader to the basic workflow of the FEM Workbench, as well as most of the tools that are available to perform a static analysis.
Requirements
- For working with FreeCADs FEM_Module it is STONGLY recommended to use version 0.16 or above.
- The use of FreeCADs FEM_Module requires the installation of some external software. Check FEM_Install for further install instructions.
- The reader has the basic knowledge to use the Part and PartDesign Workbenches
Procedure
Modeling
In this example a Cube is used as the study object, but models created in the Part or PartDesign Workbenches can be used instead.
- Create a new document
- Activate the Part Workbench
- Create a Cube
Now we have a model with which to work with.
Meshing the model
- Switch to the FEM Workbench
Netgen
- Select the model
- Select File:Fem FemMesh.svg Create FEM mesh
- Click Ok
- Select the Mesh from the Tree View
- Click New mechanical analysis from the menu to create an analysis from the mesh that was created.
You can also drag and drop a mesh to a Mechanical Analysis that does not have a mesh within the Tree View.
GMSH
The usage of psicofil's macro is recommended, and is used for this example.
- Activate the macro
- Select the object you wish to use, in this case our Cube
- Check the box Create Mechanical Analysis from mesh
- Click OK
We have now meshed our object and are ready to add constraints and forces.
Constraints and Forces
- Hide the mesh from the Tree View.
- Show the original model
- Select Create FEM fixed constraint
- Select the bottom face of the Box and click OK
- Select Create FEM force constraint
- Select the top face of the Box and set the Area load value to 20 000
- Click OK
We now have established the restrictions and forces for our static study.
Final preparations
- Select File:Fem Material.svg Mechanical material... and choose Steel-generic as the material
- Click OK
Running the Solver
- Select File:Fem NewAnalysis.svg Start calculation from the menu
- Select Write Calculix Input File
- Select Run Calculix
- Click Close
Analyzing Results
- Select File:Fem Result.svg Show result
- Choose among the different Result types to view the results
- The slider at the bottom can be used to alter the mesh to view the deformation in a simplified manner
- To remove the results select File:Fem PurgeResults.png Purge results
We are now finished with the basic workflow for the FEM Module.