FEM ConstraintContact: Difference between revisions

From FreeCAD Documentation
(Reintroduced the WB prefix for the button.)
(Module to Workbench renaming.)
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|[[FEM_ConstraintDisplacement|Constraint displacement]]
|[[FEM_ConstraintDisplacement|Constraint displacement]]
|[[FEM_ConstraintTie|Constraint tie]]
|[[FEM_ConstraintTie|Constraint tie]]
|[[FEM_Module|FEM]]
|[[FEM_Workbench|FEM]]
|IconL=FEM_ConstraintDisplacement.svg
|IconL=FEM_ConstraintDisplacement.svg
|IconR=FEM_ConstraintTie.svg
|IconR=FEM_ConstraintTie.svg
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|Name=FEM ConstraintContact
|Name=FEM ConstraintContact
|MenuLocation=Model → Mechanical Constraints → Constraint contact
|MenuLocation=Model → Mechanical Constraints → Constraint contact
|Workbenches=[[Fem_Workbench|FEM]]
|Workbenches=[[FEM_Workbench|FEM]]
|SeeAlso=[[FEM_ConstraintFixed|FEM Constraint fixed]]
|SeeAlso=[[FEM_ConstraintFixed|FEM Constraint fixed]]
}}
}}
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|[[FEM_ConstraintDisplacement|Constraint displacement]]
|[[FEM_ConstraintDisplacement|Constraint displacement]]
|[[FEM_ConstraintTie|Constraint tie]]
|[[FEM_ConstraintTie|Constraint tie]]
|[[FEM_Module|FEM]]
|[[FEM_Workbench|FEM]]
|IconL=FEM_ConstraintDisplacement.svg
|IconL=FEM_ConstraintDisplacement.svg
|IconR=FEM_ConstraintTie.svg
|IconR=FEM_ConstraintTie.svg

Revision as of 18:26, 21 August 2021

FEM ConstraintContact

Menu location
Model → Mechanical Constraints → Constraint contact
Workbenches
FEM
Default shortcut
None
Introduced in version
-
See also
FEM Constraint fixed

Description

Creates a FEM constraint for contact between 2 surfaces.

Usage

  1. There are several ways to invoke the command:
    • Press the FEM ConstraintContact button.
    • Select the Model → Mechanical Constraints → Constraint contact option from the 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

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