Difference between revisions of "FEM ConstraintContact"

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#Click on [[Image:FEM ConstraintContact.png|32px]] or choose {{KEY|Model}} → '''Mechanical Constraints''' → {{KEY|[[Image:FEM ConstraintContact.png|32px]] Constraint contact}}  from the top menu.
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#Click on [[Image:FEM ConstraintContact.png|32px]] or choose {{KEY|Model}} → '''Mechanical Constraints''' → {{KEY|[[Image:FEM ConstraintContact.png|32px]] Constraint contact}}  from the FEM dropdown menu.
 
#Select the master face.
 
#Select the master face.
 
#Select the slave face.
 
#Select the slave face.
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#The contact constraint can only be applied to two faces.
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# The contact constraint can only be applied to two faces.
#development for multiple contact at once: https://forum.freecadweb.org/viewtopic.php?f=18&t=15699&start=130#p303275
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# Development for multiple contact at once: https://forum.freecadweb.org/viewtopic.php?f=18&t=15699&start=130#p303275
  
 
==Notes== <!--T:5-->
 
==Notes== <!--T:5-->
=== Some tipps how to model? ===
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=== Tips for modeling ===
 
* from https://forum.freecadweb.org/viewtopic.php?f=18&p=340874#p340494
 
* from https://forum.freecadweb.org/viewtopic.php?f=18&p=340874#p340494
 
* Better use linear elements otherwise calculations are very time consuming
 
* Better use linear elements otherwise calculations are very time consuming
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** If the surfaces are of comparable size, the surface on the stiffer body should act as the master surface.
 
** If the surfaces are of comparable size, the surface on the stiffer body should act as the master surface.
 
** If the surfaces are of comparable size and stiffness, the surface with the coarser mesh should act as the master surface.
 
** If the surfaces are of comparable size and stiffness, the surface with the coarser mesh should act as the master surface.
 
  
 
=== CalculiX === <!--T:9-->
 
=== CalculiX === <!--T:9-->
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* A very detailed CalculiX contact example:
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* A very detailed CalculiX contact example. ([http://dip28p.web.fc2.com/calculix/netgen2calculix/index.html link])
** http://dip28p.web.fc2.com/calculix/netgen2calculix/index.html
 
  
 
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* A very cool example too. In German supforum.
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* A very cool example found in the FreeCAD German subforum. ([https://forum.freecadweb.org/viewtopic.php?f=13&t=39663&start=10#p337254 link])
** https://forum.freecadweb.org/viewtopic.php?f=13&t=39663&start=10#p337254
 
  
 
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Revision as of 22:31, 13 January 2020

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FEM ConstraintContact.png FEM ConstraintContact

Menu location
Model → Mechanical Constraints → Constraint contact
Workbenches
FEM
Default shortcut
Introduced in version
-
See also
FEM tutorial


Description

Creates a FEM constraint for contact between 2 surfaces.

How to use

  1. Click on FEM ConstraintContact.png or choose ModelMechanical ConstraintsFEM ConstraintContact.png Constraint contact from the FEM dropdown menu.
  2. Select the master face.
  3. Select the slave face.
  4. Enter a contact stiffness.
  5. Enter a friction coefficient.

Limitations

  1. The contact constraint can only be applied to two faces.
  2. Development for multiple contact at once: https://forum.freecadweb.org/viewtopic.php?f=18&t=15699&start=130#p303275

Notes

Tips for modeling

  • from https://forum.freecadweb.org/viewtopic.php?f=18&p=340874#p340494
  • Better use linear elements otherwise calculations are very time consuming
  • master/slave assignment:
    • The larger of the two surfaces should act as the master surface.
    • If the surfaces are of comparable size, the surface on the stiffer body should act as the master surface.
    • If the surfaces are of comparable size and stiffness, the surface with the coarser mesh should act as the master surface.

CalculiX

  • A very detailed CalculiX contact example. (link)
  • A very cool example found in the FreeCAD German subforum. (link)