FEM ConstraintContact: Difference between revisions
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** https://forum.freecadweb.org/viewtopic.php?f=18&t=21331 |
** https://forum.freecadweb.org/viewtopic.php?f=18&t=21331 |
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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) |
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* A very good CalculiX contact example can be found here: http://dip28p.web.fc2.com/calculix/netgen2calculix/index.html |
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Revision as of 12:34, 6 January 2019
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.
How to use
- Click on or choose Model → Mechanical Constraints → Constraint contact from the top menu.
- Select the master face.
- Select the slave face.
- Enter a contact stiffness.
- Enter a friction coefficient.
Limitations
- The contact constraint can only be applied to two faces.
Notes
CalculiX
- The contact stiffness should be 10 times the young's modulus of the material for hard contact. The higher the value for contact stiffness, the harder the contact between surfaces.
- The slave face is the face which penetrates into the master face, and therefore experiences more deformation.
- The *CONTACT PAIR card is used for modeling contact in CalculiX. The constraint uses Face-to-Face penalty contact and the contact formulation is explained in detail at http://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node112.html
- Overview for different contact types: https://forum.freecadweb.org/viewtopic.php?f=18&t=15699&start=90#p188736
- Further interesting informations:
- A very good CalculiX contact example can be found here: http://dip28p.web.fc2.com/calculix/netgen2calculix/index.html