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Contact definition : Node or Surface???

Contact definition : Node or Surface???

Contact definition : Node or Surface???

(OP)
Hi,

I'm using ABAQUS/Explicit and i'd like to modelize contact between a tool and a sheet. I use a master/slave contact algorithm with penalty methods. To define the slave surface i can choose Node or Surface. I get results which are very differents from one to the others. What should I choose? Where did the difference come from? I think from interpolation...
Regards
Pitch

RE: Contact definition : Node or Surface???

That's very interesting. Is your model identical when performing the analysis ?

What does the documentation say about the underlying formulation used when choosing Node vs Surface ?

RE: Contact definition : Node or Surface???

(OP)
The model in the two cases are indentical. I've only changed the definition of the slave surface.

I've looked for explanation in the manual and I've found it yet.

RE: Contact definition : Node or Surface???

What results are very different ?

RE: Contact definition : Node or Surface???

(OP)
The temperature fields and the mechanical fields... When I recalculate the friction coefficient, in one case I didn't find the one I put in input... And my goal is to make a thermomechanical analysis so it's a big problem...

RE: Contact definition : Node or Surface???

Did you read the overview from
ABAQUS Analysis User's Manual
       -> 2.3.3 Defining node-based surfaces  ??


"A node-based “surface”:

should be used with caution or not at all if accurate contact stresses are needed or if heat will be exchanged between the two surfaces;"

RE: Contact definition : Node or Surface???

(OP)
Thank you, it will help me a lot in the future. Any way I concluded the same idea that there is in the manual : use of the element-based surface defintion...

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