FEM ConstraintContact: Difference between revisions

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<languages/>
<languages/>
<translate>
<translate>

<!--T:11-->
<!--T:11-->
{{Docnav
{{docnav|[[FEM_ConstraintPlaneRotation|Constraint plane rotation]]|[[FEM_ConstraintTransform|Constraint transform]]|[[FEM_Module|FEM_Module]]}}
|[[FEM_ConstraintDisplacement|Constraint displacement]]
|[[FEM_ConstraintTie|Constraint tie]]
|[[FEM_Module|FEM]]
|IconL=FEM_ConstraintDisplacement.svg
|IconR=FEM_ConstraintTie.svg
|IconC=Workbench_FEM.svg
}}


<!--T:1-->
<!--T:1-->
{{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]]
|SeeAlso=[[FEM_ConstraintFixed|FEM Constraint fixed]]
}}


==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-->


<!--T:7-->
<!--T:7-->
# There are several ways to invoke the command:
#Click on [[Image:FEM ConstraintContact.png|32px]] or choose {{KEY|Model}}'''Mechanical Constraints'''{{KEY|[[Image:FEM ConstraintContact.png|32px]] Constraint contact}} from the top menu.
#* Press the {{Button|[[Image:FEM_ConstraintContact.svg|16px]] [[FEM_ConstraintContact|ConstraintContact]]}} button.
#Select the master face.
#* Select the {{MenuCommand|Model → Mechanical Constraints → [[Image:FEM_ConstraintContact.svg|16px]] Constraint contact}} option from the menu.
#Select the slave face.
# Select the master face.
#Enter a contact stiffness.
# Select the slave face.
#Enter a friction coefficient.
# Enter a contact stiffness.
# Enter a friction coefficient.


==Limitations== <!--T:4-->
==Limitations== <!--T:4-->


<!--T:8-->
<!--T:8-->
#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


==Notes== <!--T:5-->
==Notes== <!--T:5-->
=== 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 === <!--T:9-->
=== CalculiX === <!--T:9-->
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<!--T:10-->
<!--T:10-->
* 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
<!--T:15-->
* A very cool example found in the FreeCAD German subforum. ([https://forum.freecadweb.org/viewtopic.php?f=13&t=39663&start=10#p337254 link])



<!--T:12-->
<!--T:12-->
{{Docnav
{{docnav|[[FEM_ConstraintPlaneRotation|Constraint plane rotation]]|[[FEM_ConstraintTransform|Constraint transform]]|[[FEM_Module|FEM_Module]]}}
|[[FEM_ConstraintDisplacement|Constraint displacement]]
{{FEM Tools navi}}
|[[FEM_ConstraintTie|Constraint tie]]
{{Userdocnavi}}
|[[FEM_Module|FEM]]
|IconL=FEM_ConstraintDisplacement.svg
|IconR=FEM_ConstraintTie.svg
|IconC=Workbench_FEM.svg
}}

</translate>
</translate>
{{FEM Tools navi{{#translation:}}}}
{{Userdocnavi{{#translation:}}}}
{{clear}}
{{clear}}

Revision as of 21:42, 25 February 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 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)