Tie Constraint surfaces
Tie Constraint surfaces
(OP)
Hi There,
I am trying to model contact of indenting a circular embryo with a rigid indenter.
The embryo has a outer layer and inner matter. I used solid elements for the inner matter and shell elements for the outer layer. I need to constrain the inner matter follow the outer layer indentation using tie constraint.
The Slave surface is obviously the boundary of the solid part but I am not sure about Master surface. The outer layer has 2 surface and each surface has 2 sides. Can anyone help me with the slave surface of the tie constraint?
Regards,
Ladykin
I am trying to model contact of indenting a circular embryo with a rigid indenter.
The embryo has a outer layer and inner matter. I used solid elements for the inner matter and shell elements for the outer layer. I need to constrain the inner matter follow the outer layer indentation using tie constraint.
The Slave surface is obviously the boundary of the solid part but I am not sure about Master surface. The outer layer has 2 surface and each surface has 2 sides. Can anyone help me with the slave surface of the tie constraint?
Regards,
Ladykin





RE: Tie Constraint surfaces
Rob Stupplebeen
https://sites.google.com/site/robertkstupplebeen/
RE: Tie Constraint surfaces
Thanks for your reply. I tried skin, it works perfectly fine but using skin I can not define the thickness of the outer layer. Please let me know if you have any idea.
Regards,
RE: Tie Constraint surfaces
You can then define a surface from the SPOS and SNEG side of the elements in your outer layer.
Assign a contact pair with the surface of the outer layer to be indented (the SPOS surface) as a slave surface, and the rigid indenter as the master surface.
Assign a tie pair with the surface made from your solid elements slaved to the master surface on the other side of the outer layer elements (the SNEG surface).
This scheme should allow the indenter to correctly contact the outer layer, and transfer loads into the outer layer and then the solid elements.
One thing to be aware of, the contact routine is very sensitive to master-slave assignments and mesh refinement. You may need to play around with the mesh densities if you go with this method. Good luck.