FEM ConstraintContact/ru: Difference between revisions

From FreeCAD Documentation
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(Updating to match new version of source page)
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<languages/>
<languages/>
{{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
}}


<div class="mw-translate-fuzzy">
<div class="mw-translate-fuzzy">
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==How to use==
==How to use==


#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.
#Click on [[Image:FEM ConstraintContact.png|32px]] or choose {{KEY|Model}} → '''Mechanical Constraints''' → {{KEY|[[Image:FEM ConstraintContact.png|32px]] Constraint contact}} from the FEM dropdown menu.
#Select the master face.
#Select the master face.
#Select the slave face.
#Select the slave face.
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==Limitations==
==Limitations==


#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


==Notes==
==Notes==
=== Some tipps how to model? ===
=== 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
* Better use linear elements otherwise calculations are very time consuming
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** 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.
** If the surfaces are of comparable size and stiffness, the surface with the coarser mesh 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 ===
=== CalculiX ===
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** https://forum.freecadweb.org/viewtopic.php?f=18&t=15699 (initial contact topic)
** https://forum.freecadweb.org/viewtopic.php?f=18&t=15699 (initial contact topic)


* 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


* 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


{{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
}}


{{FEM Tools navi}}
{{FEM Tools navi}}

Revision as of 10:50, 16 January 2020

Other languages:

FEM ConstraintContact

Системное название
FEM ConstraintContact
Расположение в меню
FEM → Constraint contact
Верстаки
FEM
Быстрые клавиши
Нет
Представлено в версии
-
См. также
FEM tutorial

Description

Creates a FEM constraint for contact between 2 surfaces.

How to use

  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)