FEM ConstraintContact

From FreeCAD Documentation
Jump to navigation Jump to search
This page is a translated version of the page FEM ConstraintContact and the translation is 7% complete.
Outdated translations are marked like this.
Other languages:
English • ‎français • ‎italiano • ‎română • ‎русский

FEM ConstraintContact.png FEM ConstraintContact

Расположение в меню
FEM → Constraint contact
Быстрые клавиши
Представлено в версии
См. также
FEM tutorial


Creates a FEM constraint for contact between 2 surfaces.


  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.


  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


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.


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