unable to complete run with nonlinear contact (SOL601 NXN) 1

[engineerbe]

Hello Femap / Nastran users,

When using contact in an Advanced Nonlinear analysis (SOL601), I often have trouble to get convergence. At the moment I have a model of a circular ring that is seated in a shallow groove. The ring is pre-tensioned, so want to stay in the groove. Now I'm trying to push the ring out of the groove. This point, were the ring is forced sideways and the contact between groove and ring needs to change, is the problem. I have used small meshed, course meshes, changes parameters, contact definitions and of course small time steps and different convergence criteria.
I'm getting out of options and really would like to stop with this trial and error testing. "Didn't you read the manuals?" you would ask. I'm busy trying to find my way in all the manuals, but every time I found a possible helpful option, I've tried and did not succeed. I would really appreciate a 'best practice' workflow or advice on how to find what is bothering the solver.

Thanks in advance for all your tips.
Regards, Rob

 

[trainguy]

Engineerbe,

Have you tried contacting your re-seller for tech support?

Have you tried this handbook?

http://www.femcomp.se/pdf/NEiNastranNonlinearAnalysisHandbook.pdf

Good luck...

tg

 

[engineerbe]

Hi trainguy,

Thanks for your reaction. I'm using NX Nastran, so the parameters mentioned in the Handbook aren't of much use. I looked in to the handbook though, to see if I can find any hints, but it's al the usual stuff.

I work at a reseller... but having knowledge of and experience with al functions of these kind of software is almost impossible.

Anyone else who can give some best practice tips on non linear contact with Femap + NX Nastran?