Excessive rotation of plastic axes

Altair Forum User

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

Altair Forum User

Hi Viven,

 

can you share the entire .out file?

Altair Forum User

Hi Prokash

 

Here is the .out file

 

Regards

 

Vivien

Unable to find an attachment - read this blog

Altair Forum User

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.