FEM ConstraintContact

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This page is a translated version of the page FEM ConstraintContact and the translation is 6% complete.

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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.

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.


  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)