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<html><head><title>FEM tutorial/de</title><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><link type='text/css' href='wiki.css' rel='stylesheet'></head><body><h1>FEM tutorial/de</h1></div>
<div id="mw-content-text" lang="de" dir="ltr" class="mw-content-ltr"><hr/><div class="mw-parser-output"><table class="fcinfobox wikitable ct" style="width: 230px; float: right; margin-left: 1em">
<tr>
<td class="ctTitle">
<h3><span class="mw-headline" id="Tutorial"><a href="https://www.freecadweb.org/wiki/index.php?title=File:Base_ExampleCommandModel.png" class="image"><img alt="Base ExampleCommandModel.png" src="32px-Base_ExampleCommandModel.png" width="32" height="30" srcset="/wiki/images/thumb/9/93/Base_ExampleCommandModel.png/48px-Base_ExampleCommandModel.png 1.5x, /wiki/images/9/93/Base_ExampleCommandModel.png 2x" /></a> Tutorial</span></h3>
</td></tr>
<tr>
<th class="ctOdd">Topic
</th></tr>
<tr>
<td class="ctEven">Finite Element Analysis
</td></tr>
<tr>
<th class="ctOdd">Level
</th></tr>
<tr>
<td class="ctEven">Beginner
</td></tr>
<tr>
<th class="ctOdd">Time to complete
</th></tr>
<tr>
<td class="ctEven">10 minutes + Solver time
</td></tr>
<tr>
<th class="ctOdd">Author
</th></tr>
<tr>
<td class="ctEven"><a rel="nofollow" class="external text" href="https://www.freecadweb.org/wiki/index.php?title=User:Drei">Drei</a>
</td></tr>
<tr>
<th class="ctOdd">FreeCAD version
</th></tr>
<tr>
<td class="ctEven">0.16.6700 or above
</td></tr>
<tr>
<th class="ctOdd">Example File(s)
</th></tr>
<tr>
<td class="ctEven">
</td></tr>
<tr>
<td class="ctToc"><br /><div id="toc" class="toc"><div class="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1"><a href="#Tutorial"><span class="tocnumber">1</span> <span class="toctext">Tutorial</span></a></li>
<li class="toclevel-1 tocsection-1"><a href="#Introduction"><span class="tocnumber">2</span> <span class="toctext">Introduction</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="#Requirements"><span class="tocnumber">3</span> <span class="toctext">Requirements</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="#Procedure"><span class="tocnumber">4</span> <span class="toctext">Procedure</span></a>
<ul>
<li class="toclevel-2 tocsection-4"><a href="#Modeling"><span class="tocnumber">4.1</span> <span class="toctext">Modeling</span></a></li>
<li class="toclevel-2 tocsection-5"><a href="#Creating_the_Analysis"><span class="tocnumber">4.2</span> <span class="toctext">Creating the Analysis</span></a>
<ul>
<li class="toclevel-3 tocsection-6"><a href="#Netgen"><span class="tocnumber">4.2.1</span> <span class="toctext">Netgen</span></a></li>
<li class="toclevel-3 tocsection-7"><a href="#GMSH"><span class="tocnumber">4.2.2</span> <span class="toctext">GMSH</span></a></li>
</ul>
</li>
<li class="toclevel-2 tocsection-8"><a href="#Constraints_and_Forces"><span class="tocnumber">4.3</span> <span class="toctext">Constraints and Forces</span></a></li>
<li class="toclevel-2 tocsection-9"><a href="#Final_preparations"><span class="tocnumber">4.4</span> <span class="toctext">Final preparations</span></a></li>
<li class="toclevel-2 tocsection-10"><a href="#Running_the_Solver"><span class="tocnumber">4.5</span> <span class="toctext">Running the Solver</span></a>
<ul>
<li class="toclevel-3 tocsection-11"><a href="#Standard_Procedure"><span class="tocnumber">4.5.1</span> <span class="toctext">Standard Procedure</span></a></li>
<li class="toclevel-3 tocsection-12"><a href="#Quick_Procedure"><span class="tocnumber">4.5.2</span> <span class="toctext">Quick Procedure</span></a></li>
</ul>
</li>
<li class="toclevel-2 tocsection-13"><a href="#Analyzing_Results"><span class="tocnumber">4.6</span> <span class="toctext">Analyzing Results</span></a></li>
</ul>
</li>
</ul>
</div>
</td></tr></table>
<p><br />
</p>
<h3><span class="mw-headline" id="Introduction">Introduction</span></h3>
<p>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.
</p><p><a href="https://www.freecadweb.org/wiki/index.php?title=File:FEM_tutorial_result.png" class="image"><img alt="FEM tutorial result.png" src="480px-FEM_tutorial_result.png" width="480" height="270" srcset="/wiki/images/thumb/9/9e/FEM_tutorial_result.png/720px-FEM_tutorial_result.png 1.5x, /wiki/images/thumb/9/9e/FEM_tutorial_result.png/960px-FEM_tutorial_result.png 2x" /></a>
</p>
<h3><span class="mw-headline" id="Requirements">Requirements</span></h3>
<ul><li> FreeCAD version 0.16.6700 or above</li>
<li> <a rel="nofollow" class="external text" href="http://sourceforge.net/projects/netgen-mesher/">Netgen</a> and/or <a rel="nofollow" class="external text" href="http://geuz.org/gmsh/">GMSH</a> is installed on the system</li>
<li> In the case of GMSH, installation of <a rel="nofollow" class="external text" href="https://github.com/psicofil/Macros_FreeCAD">psicofil's macro</a> is recommended</li>
<li> <a rel="nofollow" class="external text" href="http://www.calculix.de/">Calculix</a> is installed on the system</li>
<li> The reader has the basic knowledge to use the Part and PartDesign Workbenches</li></ul>
<h3><span class="mw-headline" id="Procedure">Procedure</span></h3>
<h4><span class="mw-headline" id="Modeling">Modeling</span></h4>
<p>In this example a Cube is used as the study object, but models created in the Part or PartDesign Workbenches can be used instead.
</p>
<ol><li> Create a new document</li>
<li> Activate the Part Workbench</li>
<li> Create a Cube</li>
<li> Change its <b>Dimensions</b> to the following:
<ol><li> Height: 1.000 mm</li>
<li> Length: 8.000 mm</li>
<li> Width: 1.000 mm</li></ol></li></ol>
<p>Now we have a model with which to work with.
</p>
<h4><span class="mw-headline" id="Creating_the_Analysis">Creating the Analysis</span></h4>
<h5><span class="mw-headline" id="Netgen">Netgen</span></h5>
<ol><li> Select the model </li>
<li> Click <a href="https://www.freecadweb.org/wiki/index.php?title=File:FEM_Analysis.png" class="image"><img alt="FEM Analysis.png" src="16px-FEM_Analysis.png" width="16" height="16" srcset="/wiki/images/thumb/5/57/FEM_Analysis.png/24px-FEM_Analysis.png 1.5x, /wiki/images/thumb/5/57/FEM_Analysis.png/32px-FEM_Analysis.png 2x" /></a> <a href="FEM_Analysis.html" title="FEM Analysis">New mechanical analysis</a> from the menu to create an analysis from the object that was selected</li>
<li> In the meshing dialog, click <b>OK</b></li></ol>
<p>You can also drag and drop a mesh to a Mechanical Analysis that does not have a mesh within the Tree View.
</p>
<h5><span class="mw-headline" id="GMSH">GMSH</span></h5>
<p>The usage of psicofil's macro is recommended, and is used for this example.
</p>
<ol><li> Activate the macro</li>
<li> Select the object you wish to use, in this case our Cube</li>
<li> Check the box <b>Create Mechanical Analysis from mesh</b></li>
<li> Click <b>OK</b></li></ol>
<p>We have now meshed our object and are ready to add constraints and forces.
</p>
<h4><span class="mw-headline" id="Constraints_and_Forces">Constraints and Forces</span></h4>
<ol><li> Hide the mesh from the Tree View.</li>
<li> Show the original model</li>
<li> Select <a href="https://www.freecadweb.org/wiki/index.php?title=File:FEM_FixedConstraint.png" class="image"><img alt="FEM FixedConstraint.png" src="16px-FEM_FixedConstraint.png" width="16" height="16" srcset="/wiki/images/thumb/d/d3/FEM_FixedConstraint.png/24px-FEM_FixedConstraint.png 1.5x, /wiki/images/thumb/d/d3/FEM_FixedConstraint.png/32px-FEM_FixedConstraint.png 2x" /></a> <a href="FEM_ConstraintFixed.html" title="FEM ConstraintFixed">Create FEM fixed constraint</a></li>
<li> Select the back face of the Cube (face on the <b>YZ</b> axis) and click OK</li>
<li> Select <a href="https://www.freecadweb.org/wiki/index.php?title=File:FEM_ForceConstraint.png" class="image"><img alt="FEM ForceConstraint.png" src="16px-FEM_ForceConstraint.png" width="16" height="16" srcset="/wiki/images/thumb/5/5f/FEM_ForceConstraint.png/24px-FEM_ForceConstraint.png 1.5x, /wiki/images/thumb/5/5f/FEM_ForceConstraint.png/32px-FEM_ForceConstraint.png 2x" /></a> <a href="FEM_ConstraintForce.html" title="FEM ConstraintForce">Create FEM force constraint</a></li>
<li> Select the front face of the Cube (the face parallel to the back face) and set the <b>Area load</b> value to 9000000.00</li>
<li> Set the <b>Direction</b> to <b>-Z</b> by selecting one of the face edges parallel to that direction.</li>
<li> Click OK</li></ol>
<p>We now have established the restrictions and forces for our static study.
</p>
<h4><span class="mw-headline" id="Final_preparations">Final preparations</span></h4>
<ol><li> Select <a href="https://www.freecadweb.org/wiki/index.php?title=File:FEM_Material.png" class="image"><img alt="FEM Material.png" src="16px-FEM_Material.png" width="16" height="16" srcset="/wiki/images/thumb/1/1e/FEM_Material.png/24px-FEM_Material.png 1.5x, /wiki/images/1/1e/FEM_Material.png 2x" /></a> <a href="FEM_MaterialSolid.html" title="FEM MaterialSolid">Mechanical material...</a> and choose Calculix as the material</li>
<li> Click <b>OK</b></li></ol>
<h4><span class="mw-headline" id="Running_the_Solver">Running the Solver</span></h4>
<h5><span class="mw-headline" id="Standard_Procedure">Standard Procedure</span></h5>
<ol><li> Select the solver object <a href="https://www.freecadweb.org/wiki/index.php?title=File:FEM_Solver.png" class="image"><img alt="FEM Solver.png" src="16px-FEM_Solver.png" width="16" height="13" srcset="/wiki/images/thumb/b/b7/FEM_Solver.png/24px-FEM_Solver.png 1.5x, /wiki/images/thumb/b/b7/FEM_Solver.png/32px-FEM_Solver.png 2x" /></a> contained in the <b>Mechanical Analysis</b></li>
<li> Select <a href="https://www.freecadweb.org/wiki/index.php?title=File:FEM_Calculation.png" class="image"><img alt="FEM Calculation.png" src="16px-FEM_Calculation.png" width="16" height="18" srcset="/wiki/images/thumb/4/4a/FEM_Calculation.png/24px-FEM_Calculation.png 1.5x, /wiki/images/thumb/4/4a/FEM_Calculation.png/32px-FEM_Calculation.png 2x" /></a> <a href="FEM_SolverControl.html" title="FEM SolverControl">Start calculation</a> from the menu</li>
<li> Select <b>Write Calculix Input File</b></li>
<li> Select <b>Run Calculix</b></li>
<li> Click <b>Close</b></li></ol>
<h5><span class="mw-headline" id="Quick_Procedure">Quick Procedure</span></h5>
<ol><li> Select the solver object <a href="https://www.freecadweb.org/wiki/index.php?title=File:FEM_Solver.png" class="image"><img alt="FEM Solver.png" src="16px-FEM_Solver.png" width="16" height="13" srcset="/wiki/images/thumb/b/b7/FEM_Solver.png/24px-FEM_Solver.png 1.5x, /wiki/images/thumb/b/b7/FEM_Solver.png/32px-FEM_Solver.png 2x" /></a> contained in the <b>Mechanical Analysis</b></li>
<li> Click on <a href="https://www.freecadweb.org/wiki/index.php?title=File:FEM_RunCalculiXccx.png" class="image"><img alt="FEM RunCalculiXccx.png" src="16px-FEM_RunCalculiXccx.png" width="16" height="16" srcset="/wiki/images/thumb/8/85/FEM_RunCalculiXccx.png/24px-FEM_RunCalculiXccx.png 1.5x, /wiki/images/thumb/8/85/FEM_RunCalculiXccx.png/32px-FEM_RunCalculiXccx.png 2x" /></a> <a href="FEM_SolverRun.html" title="FEM SolverRun">Quick Analysis</a>.</li></ol>
<h4><span class="mw-headline" id="Analyzing_Results">Analyzing Results</span></h4>
<ol><li> From the <b>Object Tree</b>, select the <b>Results</b> object</li>
<li> Select <a href="https://www.freecadweb.org/wiki/index.php?title=File:FEM_ShowResult.png" class="image"><img alt="FEM ShowResult.png" src="16px-FEM_ShowResult.png" width="16" height="16" srcset="/wiki/images/thumb/f/f5/FEM_ShowResult.png/24px-FEM_ShowResult.png 1.5x, /wiki/images/thumb/f/f5/FEM_ShowResult.png/32px-FEM_ShowResult.png 2x" /></a> <a href="FEM_ResultShow.html" title="FEM ResultShow">Show result</a></li>
<li> Choose among the different Result types to view the results</li>
<li> 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.</li>
<li> To remove the results select <a href="https://www.freecadweb.org/wiki/index.php?title=File:FEM_PurgeResults.png" class="image"><img alt="FEM PurgeResults.png" src="16px-FEM_PurgeResults.png" width="16" height="16" srcset="/wiki/images/thumb/e/eb/FEM_PurgeResults.png/24px-FEM_PurgeResults.png 1.5x, /wiki/images/thumb/e/eb/FEM_PurgeResults.png/32px-FEM_PurgeResults.png 2x" /></a> <a href="FEM_ResultsPurge.html" title="FEM ResultsPurge">Purge results</a></li></ol>
<div class="note"><b>Comparison to previous example file</b>
<p>If you select the <b>Z displacement</b> result type, you can see that the obtained value is almost 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.
</p>
</div>
<p><br />
We are now finished with the basic workflow for the <a href="FEM_Module.html" title="FEM Module">FEM Module</a>.
</p><p><br />
</p><p><br />
</p>
<div style="clear:both"></div>
</div>
</div>
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Online version: "<a dir="ltr" href="https://www.freecadweb.org/wiki/index.php?title=FEM_tutorial/de&amp;oldid=229176">http://www.freecadweb.org/wiki/index.php?title=FEM_tutorial/de&amp;oldid=229176</a>"</div>
<div id="catlinks" class="catlinks" data-mw="interface"></div><div class="visualClear"></div>
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<h2>Navigation menu</h2>
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