Non-linear static analysis using composite shells

MichaelOS

Hello,
I am trying to carry out a non-linear (large deflection) analysis of a multi-layer (GFRP) composite structure using DKT elements and defining the composite material with ELAS_ORTHO. I get the following error message:

Les matériaux de coque homogénéisées (ELAS_COQUE) sont interdits en non-linéaire.

It's strange as I haven't defined the material using ELAS_COQUE. Nevertheless I have seen on other posts that there have been issues carrying out nonlinear analyses with composite materials. Is this still the case or is there a workaround?

Thanks in advance.

AsterO'dactyle

Hello,

The error message is strange, I agree, we will look into it.
However, please note that DKT elements cannot handle large transformations anyway.

AsterO'dactyle

Hello,

I confirm that the message is incorrect, but it accurately reflects an impossibility: nonlinear calculations with composites are not (yet) possible in code_aster.