FEM ConstraintForce

    From FreeCAD Documentation

    FEM ConstraintForce.svg FEM ConstraintForce

    Menu location
    Model → Mechanical Constraints → Constraint force
    Default shortcut
    Introduced in version
    See also
    FEM ConstraintPressure


    This command applies a force of given value [N] to selected target geometry.


    1. There are several ways to invoke the command to apply a force to a face, line or point:
      • Click on FEM ConstraintForce.svg FEM Constraint force button
      • Select the Model → Mechanical Constraints → FEM ConstraintForce.svg Constraint force option from the menu.
    2. If you have Mesh displayed, you need to hide it (select the mesh object and press spacebar or right-click and select Hide item) and show the original model.
    3. Click on a face, line or point to which a force should be applied. The object will appear in the list of geometrical objects.
    4. Fill in Load [N] with a force value in [N].
    5. Direction: In a typical case, you'll leave this field empty to apply a force in the normal direction. You can revert the direction of the force by clicking Reverse direction. In other cases, you need to pick a face/plane or edge, which serves as reference for force direction.
    6. Click OK to finish and create the FEM ConstraintForce.svg ConstraintForce object.

    FEM ConstraintForce example.JPG


    • Defined force is applied uniformly to selected objects. For example, if you define one force constraint with 200 N applied to two faces having the same area, each face will be uniformly loaded with 100 N.