FEM ConstraintContact: Difference between revisions

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{{Docnav
{{Docnav|[[FEM_ConstraintPlaneRotation|Constraint plane rotation]]|[[FEM_ConstraintTransform|Constraint transform]]|[[FEM_Module|FEM]]|IconL=FEM_ConstraintPlaneRotation.png|IconC=Workbench_FEM.svg|IconR=FEM_ConstraintTransform.png}}
|[[FEM_ConstraintPlaneRotation|Constraint plane rotation]]
|[[FEM_ConstraintTransform|Constraint transform]]
|[[FEM_Module|FEM]]
|IconL=FEM_ConstraintPlaneRotation.png
|IconC=Workbench_FEM.svg
|IconR=FEM_ConstraintTransform.png
}}


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{{GuiCommand
{{GuiCommand|Name=FEM ConstraintContact|MenuLocation=Model → Mechanical Constraints → Constraint contact||Workbenches=[[Fem Workbench|FEM]]|Shortcut=|SeeAlso=[[FEM_tutorial|FEM tutorial]]}}
|Name=FEM ConstraintContact
|MenuLocation=Model → Mechanical Constraints → Constraint contact
|Workbenches=[[Fem Workbench|FEM]]
|Shortcut=
|SeeAlso=[[FEM_tutorial|FEM tutorial]]
}}


==Description== <!--T:2-->
==Description== <!--T:2-->
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Creates a FEM constraint for contact between 2 surfaces.
Creates a FEM constraint for contact between 2 surfaces.


==How to use== <!--T:3-->
==Usage== <!--T:3-->


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#The contact constraint can only be applied to two faces.
# The contact constraint can only be applied to two faces.
#development for multiple contact at once: https://forum.freecadweb.org/viewtopic.php?f=18&t=15699&start=130#p303275
# Development for multiple contact at once: https://forum.freecadweb.org/viewtopic.php?f=18&t=15699&start=130#p303275


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==Notes== <!--T:5-->
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* A very detailed CalculiX contact example:
* A very detailed CalculiX contact example. ([http://dip28p.web.fc2.com/calculix/netgen2calculix/index.html link])
** http://dip28p.web.fc2.com/calculix/netgen2calculix/index.html


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* A very cool example too. In German supforum.
* A very cool example found in the FreeCAD German subforum. ([https://forum.freecadweb.org/viewtopic.php?f=13&t=39663&start=10#p337254 link])
** https://forum.freecadweb.org/viewtopic.php?f=13&t=39663&start=10#p337254


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{{Docnav|[[FEM_ConstraintPlaneRotation|Constraint plane rotation]]|[[FEM_ConstraintTransform|Constraint transform]]|[[FEM_Module|FEM]]|IconL=FEM_ConstraintPlaneRotation.png|IconC=Workbench_FEM.svg|IconR=FEM_ConstraintTransform.png}}
|[[FEM_ConstraintPlaneRotation|Constraint plane rotation]]
|[[FEM_ConstraintTransform|Constraint transform]]
|[[FEM_Module|FEM]]|IconL=FEM_ConstraintPlaneRotation.png
|IconC=Workbench_FEM.svg
|IconR=FEM_ConstraintTransform.png
}}


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Revision as of 22:15, 22 February 2020

FEM ConstraintContact

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

Description

Creates a FEM constraint for contact between 2 surfaces.

Usage

  1. Click on or choose ModelMechanical Constraints 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.

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)