*CONTACT PAIR, TIED vs. *SURFACE BEHAVIOR, NO SEPARATION + Rough Friction

[TimoGER]

Hey guys,

I have one question. In my opinion there are two ways to tie a contact pair:

1. *CONTACT PAIR, TIED

2. *SURFACE BEHAVIOR, NO SEPARATION + Rough Friction

Can anyone explain the difference between them? When should which of them be used?

Best regards
Timo

 

[IceBreakerSours]

There is a LOT of information in the documentation AND online.

Are you new to this forum? If so, please read these FAQ:

http://www.eng-tips.com/faqs.cfm?fid=376

http://www.eng-tips.com/faqs.cfm?fid=1083

 

[loki3000]

yeah.
you can interpret tied as welded together (or from one piece)
the rest you can find in a lot of places.

http://books.google.si/books?id=1EW...Abmu4HQAQ&ved=0CGUQ6AEwCQ#v=onepage&q&f=false

 

[TimoGER]

Thanks for replying. Did you recognize that I am talking about TIED CONTACT and not TIED CONSTRAINT? Could someone please post the chapter of the Abaqus documentation or a link to a thread?

 

[IceBreakerSours]

In *Contact pair, Tied, slave DOFs are not eliminated. You may view contact constraint stress and the constraint is enforced using either the penalty or the Lagrange multiplier method. In *Tie, slave DOFs are simply eliminated and, unless you are careful, may lead to overconstraints (such as with multiple master surfaces).

Are you new to this forum? If so, please read these FAQ:

http://www.eng-tips.com/faqs.cfm?fid=376

http://www.eng-tips.com/faqs.cfm?fid=1083

 

[IceBreakerSours]

You should've been able to dig this out on your own (specifically, after having noted this in my previous comment), but anyway, for more details, look for Use of tied contact in mechanical simulations in the Analysis User's Manual.

FYI: Contact is among the hardest problems to resolve in FEM, so be sure to go through the manuals (verification, benchmark, examples, analysis user's, cae user's, keywords) very carefully.

Are you new to this forum? If so, please read these FAQ:

http://www.eng-tips.com/faqs.cfm?fid=376

http://www.eng-tips.com/faqs.cfm?fid=1083

 

[TimoGER]

Thanks IceBreakerSours for your patience. Just to clarify what I asked for: my question was about the difference between CONTACT PAIR, TIED and the interaction properties for contacts SURFACE BEHAVIOR, NO SEPARATION + FRICTION, ROUGH. Both should prevent a relative movement of two surfaces in normal and lateral direction. Maybe I haven't expressed myself clearly. Sorry.