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Contact Issue - gap in results?

Pioneer
Pioneer

Hi,

an analysis is done (axisymmetric) with contact.

The behaviour at the extremity of the contact line seems strange, since the source region penetrates the target region where it should not.

The is a reaction on a node of the source side but no reaction on the target side corresponding node.

 

Why does it happen, why only at the end of the contact object?

Please check the attached files for details.

 

 

Cyril
10 REPLIES

Re: Contact Issue - gap in results?

Phenom
Phenom

try adding the "tapered" edge to the target region, see attached

Production: NX9.0.3.4, NX10.0.2.6
Development: VB.NET (amateur level !)

Re: Contact Issue - gap in results?

Pioneer
Pioneer

Hi selex_ct,

thank you for the tip, I've just thought about this a few moments before, calculation has just run.


But unfortunately, there still seem to be missing contact on the target side!


View of contact force results (z componant) and Z displacementsView of contact force results (z componant) and Z displacements

 Best regards,

Cyril

Re: Contact Issue - gap in results?

Phenom
Phenom

Have you double-checked in the .dat file that the nodes causing the issue are actually on the BEDGE definition? I can't rember if the BCPREVIEW will work with edge contact

Production: NX9.0.3.4, NX10.0.2.6
Development: VB.NET (amateur level !)

Re: Contact Issue - gap in results?

Pioneer
Pioneer

Hi selex_ct,

 

thank you, following your remark, I checked the .dat.

Indeed, the "last" egde region is not defined for the target region.
I don't know if this is a "bug" or what, so I filed an IR on GTAC.axisymmetric contact BEDGE sets.pngbest regards,

Cyril

Re: Contact Issue - gap in results?

Phenom
Phenom

Smiley Happy

The .dat file is the "master". The software solves what you provide (in the .dat file) not what you think you have in the .sim

Production: NX9.0.3.4, NX10.0.2.6
Development: VB.NET (amateur level !)

Re: Contact Issue - gap in results?

Pioneer
Pioneer
Indeed it does, but well, the user interface should not mislead the user Smiley Wink
Thanks once more!
Cyril

Re: Contact Issue - gap in results?

Phenom
Phenom

The only thing I can think right now is that these nodes are not associated with the edge. See if you get all the nodes if you do related nodes/polygone edge

Production: NX9.0.3.4, NX10.0.2.6
Development: VB.NET (amateur level !)

Re: Contact Issue - gap in results?

Pioneer
Pioneer
Hi selex_ct,

I have modified the underlying geometry so that my model is not impacted by this problem anymore, and time is scarce to do the bug tracking for free!

thank you anyway, if I have some time I will try your advice.

best regards,
Cyril

Re: Contact Issue - gap in results?

Phenom
Phenom

Got some "issue" with contact surfaces in the last day or so. Even everyting seems to be set-up properly but I got an "error" msg when creating the .dat file about "... Boundary Conditions are applied to geometry having partial association of nodes and elements".

 

I swapped thw Source/Target surfaces and everything was created fine !

 

Production: NX9.0.3.4, NX10.0.2.6
Development: VB.NET (amateur level !)