FEM ConstraintContact

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FEM ConstraintContact.svg FEM ConstraintContact

Menu location
Model → Mechanical Constraints → Constraint contact
Default shortcut
Introduced in version
See also
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 top 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.