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Excessive rotation of plastic axes

Hello,

I have a convergence problem with one of my non linear analysis.

Some time when a step converge I have this message:

Expert: Excessive rotation of plastic axes.
Expert: Back off, adjust and retry

I would to know if there is something to prevent excessive rotation of plastic axes.

It's really recurent on my model and it increase a lot the time to converge, when he managed to converge.

Thank you for your responses.

Vivien

English

OptiStruct

Hi Viven,

can you share the entire .out file?

Hi Prokash

Here is the .out file

Regards

Vivien

Hi Vivien,

Is there is a reason for using EXPERTNL?

Usually ExpertNL is valid for small deformation.

I would suggest to run analysis with NLSTAT, NLSTAT with EXPERTNL and NLGEOM and compare.