FEM ConstraintContact/de: Difference between revisions

From FreeCAD Documentation
(Created page with "==Einschränkungen==")
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==Anwendung==
==Anwendung==


<div class="mw-translate-fuzzy">
# Es gibt mehrere Möglichkeiten den Befehl aufzurufen:
# Es gibt mehrere Möglichkeiten den Befehl aufzurufen:
#* Die Schaltfläche {{Button|[[Image:FEM_ConstraintContact.svg|16px]] [[FEM_ConstraintContact/de|Randbedingung Kontakt]]}} drücken.
#* Die Schaltfläche {{Button|[[Image:FEM_ConstraintContact.svg|16px]] [[FEM_ConstraintContact/de|Randbedingung Kontakt]]}} drücken.
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# Eine Kontaktsteifigkeit eingeben.
# Eine Kontaktsteifigkeit eingeben.
# Einen Reibungskoeffizienten eingeben.
# Einen Reibungskoeffizienten eingeben.
</div>


<span id="Limitations"></span>
<span id="Limitations"></span>
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=== Tips for modeling ===
=== Tips for modeling ===


* from https://forum.freecadweb.org/viewtopic.php?f=18&p=340874#p340494
* From: https://forum.freecadweb.org/viewtopic.php?f=18&p=340874#p340494
* Better use linear elements otherwise calculations are very time consuming
* The use of linear elements is recommended. Otherwise, calculations can be very time-consuming.
* master/slave assignment:
* Master/slave assignment:
** The larger of the two surfaces should act as the master surface.
** 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, the surface on the stiffer body should act as the master surface.

Revision as of 13:22, 11 November 2023

FEM RandbedingungKontakt

Menüeintrag
Modell → Mechanische Randbedingungen und Lasten → Randbedingung Kontakt
Arbeitsbereich
FEM
Standardtastenkürzel
Keiner
Eingeführt in Version
-
Siehe auch
FEM RandbedingungFestsetzen

Beschreibung

Erstellt eine FEM-Randbedingung für den Kontakt zwischen zwei Oberflächen.

Anwendung

  1. Es gibt mehrere Möglichkeiten den Befehl aufzurufen:
    • Die Schaltfläche Randbedingung Kontakt drücken.
    • Den Menüeintrag Modell → Mechanische Randbedingungen und Lasten → Randbedingung Kontakt auswählen.
  2. Die Hauptfläche auswählen.
  3. Die untergeordnete Fläche auswählen.
  4. Eine Kontaktsteifigkeit eingeben.
  5. Einen Reibungskoeffizienten eingeben.

Einschränkungen

  • 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
  • Because multiple meshes are currently not supported, contact must be applied to faces that are separated by (at least) a small distance. If the faces were touching (no gap between them), the result of a boolean union or boolean fragments operation (necessary to avoid having multiple meshes which is not allowed at the moment) would be a continuous mesh and thus no need to use contact anymore. See Forum discussion.

Hinweise

Tips for modeling

  • From: https://forum.freecadweb.org/viewtopic.php?f=18&p=340874#p340494
  • The use of linear elements is recommended. Otherwise, calculations can be 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)
  • An interesting example found in the FreeCAD German subforum. (link)