FEM tutorial/es
Tutorial |
Tema |
---|
Análisis de Elemento Finito |
Nivel |
Principiante |
Tiempo para completar |
10 minutos + tiempo del Solver |
Autores |
Drei |
Versión de FreeCAD |
0.16 o superior |
Archivos de ejemplos |
Ver también |
None |
Introducción
Este tutorial tiene como propósito el introducir al lector a la forma de trabajo básica del módulo FEM, así como a la mayoría de las herramientas disponibles para realizar un análisis estático.
Requisitos
- FreeCAD versión 0.16 superior
- Netgen y/o GMSH está instalado en el sistema
- Para el caso de GMSH, se recomienda instalar el macro de psicofil's macro
- Calculix está instalado en el sistema
- El lector tiene el conocimiento básico para utilizar los módulo Part y PartDesign
Procedimiento
En este ejemplo un Cubo es utilizado como objeto de estudio, pero modelos creados en los bancos de trabajo Parte y Diseño de Parte pueden ser utilizados en su lugar.
- Create a new document
- Activate the Part Workbench
- Create a Cube
- Change its Dimensions to the following:
- Height: 1.000 mm
- Length: 8.000 mm
- Width: 1.000 mm
Ahora tenemos un modelo con el que se puede trabajar.
Creating the Analysis
Netgen
- Select the model
- Click New mechanical analysis from the menu to create an analysis from the object that was selected
- In the meshing dialog, click OK
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 back face of the Cube (face on the YZ axis) and click OK
- Select Create FEM force constraint
- Select the front face of the Cube (the face parallel to the back face) and set the Area load value to 9000000.00
- Set the Direction to -Z by selecting one of the face edges parallel to that direction.
- 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 Calculix as the material
- Click OK
Running the Solver
Standard Procedure
- Select the solver object contained in the Mechanical Analysis
- Select File:Fem NewAnalysis.svg Start calculation from the menu
- Select Write Calculix Input File
- Select Run Calculix
- Click Close
Quick Procedure
- Select the solver object contained in the Mechanical Analysis
- Click on File:Fem QuickAnalysis.svg Quick Analysis.
Analyzing Results
- From the Object Tree, select the Results object
- 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 visualization. This allows us to visualize the deformation experienced by the object, keep in mind that this is an approximation.
- To remove the results select File:Fem PurgeResults.png Purge results
If you select the Z diplacement result type, you can see that the obtained value is almos identical to the test example provided by FreeCAD. Differences may occur due to the quality of the mesh and the number of nodes it possesses.
We are now finished with the basic workflow for the FEM Module.