Difference between revisions of "FEM ConstraintContact"

From FreeCAD Documentation
Jump to navigation Jump to search
Line 28: Line 28:
  
 
==Notes== <!--T:5-->
 
==Notes== <!--T:5-->
=== Some tipps how to model? ===
+
=== 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
Line 35: Line 35:
 
** 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-->

Revision as of 21:26, 13 January 2020

Other languages:
English • ‎français • ‎italiano • ‎română • ‎русский

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 top 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