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

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

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

(OP)
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

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

(OP)
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?

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

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).

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

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.

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

(OP)
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.

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