FEM tutorial/en: Difference between revisions
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=== Introduction === |
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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. |
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[[Image:FEM_tutorial_result.png|480px]] |
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=== Requirements === |
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* FreeCAD version 0.16 or above |
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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 |
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=== Procedure === |
=== Procedure === |
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The following steps show in detail how to perform a Finite Element Analysis (FEA) on a basic cube. |
The following steps show in detail how to perform a Finite Element Analysis (FEA) on a basic cube. |
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==== Modeling ==== |
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In this example a Cube is used as the study object, but models created in the Part or PartDesign Workbenches can used instead. |
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⚫ | |||
# Activate the Part Workbench |
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# Create a Cube |
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Now we have a model with which to work with. |
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==== Meshing the model ==== |
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# Switch to the FEM Workbench |
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===== Netgen ===== |
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# Select the model |
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# Select [[Image:Fem_FemMesh.svg|32px]] [[FEM Create|Create FEM mesh]] |
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# Click '''Ok''' |
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# Select the Mesh from the Tree View |
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# Click [[Image:Fem_Analysis.svg|32px]] [[FEM Analysis|New mechanical analysis]] from the menu to create an analysis from the mesh that was created. |
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You can also drag and drop a mesh to a Mechanical Analysis that does not have a mesh within the Tree View. |
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===== GMSH ===== |
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[[File:FEM_Analysis_(1).png|500px]] |
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The usage of psicofil's macro is recommended, and is used for this example. |
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# Activate the macro |
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# Select the object you wish to use, in this case our Cube |
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# Check the box '''Create Mechanical Analysis from mesh''' |
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# Click '''OK''' |
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We have now meshed our object and are ready to add constraints and forces. |
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==== Constraints and Forces ==== |
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[[File:FEM Analysis(2).png|500px]] |
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# Hide the mesh from the Tree View. |
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# Show the original model |
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# Select [[Image:Fem_ConstraintFixed.svg|32px]] [[FEM FixedConstraint|Create FEM fixed constraint]] |
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# Select the bottom face of the Box and click OK |
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# Select [[Image:Fem_ConstraintForce.svg|32px]] [[FEM ForceConstraint|Create FEM force constraint]] |
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# Select the top face of the Box and set the '''Area load''' value to 20 000 |
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# Click OK |
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We now have established the restrictions and forces for our static study. |
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==== Highlight the Cube in the selection tree and select the data tab to check the dimensions ==== |
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==== Final preparations ==== |
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[[File:FEM Analysis(3).png|500px]] |
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# Select [[Image:Fem_Material.svg|32px]] [[FEM Material|Mechanical material...]] and choose Steel-generic as the material |
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# Click '''OK''' |
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==== Running the Solver ==== |
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# Select [[Image:Fem_NewAnalysis.svg|32px]] [[FEM Calculation|Start calculation]] from the menu |
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# Select '''Write Calculix Input File''' |
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# Select '''Run Calculix''' |
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# Click '''Close''' |
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==== Analyzing Results ==== |
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[[File:FEM Analysis(4).png|500px]] |
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# Select [[Image:Fem_Result.svg|32px]] [[FEM ShowResult|Show result]] |
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# Choose among the different Result types to view the results |
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# The slider at the bottom can be used to alter the mesh to view the deformation in a simplified manner |
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#To remove the results select [[Image:Fem_PurgeResults.png|32px]] [[FEM PurgeResults|Purge results]] |
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[[Category:User Documentation]] |
[[Category:User Documentation]] |
Revision as of 20:50, 5 September 2015
Tutorial |
Topic |
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{{{Topic}}} |
Level |
Time to complete |
Authors |
FreeCAD version |
0.16 |
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
- FreeCAD version 0.16 or above
- Netgen and/or GMSH is installed on the system
- In the case of GMSH, installation of psicofil's macro is recommended
- Calculix is installed on the system
- The reader has the basic knowledge to use the Part and PartDesign Workbenches
Procedure
The following steps show in detail how to perform a Finite Element Analysis (FEA) on a basic cube.
Modeling
In this example a Cube is used as the study object, but models created in the Part or PartDesign Workbenches can 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