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Convergence Problems

Convergence Problems

Convergence Problems

(OP)
I have started using Abaqus few months ago, so this might be a simple problem but I can't solve it. In my model I must set a displacement of one rigid part that becomes in contact with a deformable part. But it only works when the displacement is small. When I use a large displacement the job is aborted because convergence problems.
What should I do? Is there anything to do with interaction properties?

Thanks..  

RE: Convergence Problems

If it's failing in the first increment or two of the step, try setting a small initial displacement for the 1st increment of the step. For example:

*STATIC
** init'l  time period  min.       max.
** time    of step      time       time
   0.05,   1.00 ,  0.0000001 ,    0.20

sets the size of the initial increment to 5% of the total in the step. ABAQUS will increase the size of subsequent increments to a maximum of 20% of the step size if convergence remains satisfactory.

Are you using NLGEOM?

Regards,
MRG

http://www.analysis.demon.co.uk

RE: Convergence Problems

(OP)
thanks mrgoldthorpe

I just didn't pay attention on the NLGeom.

Regards,

Bra1

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