Composite modeling Size optimization

Hi everyone,

I m making a composite size optimization and need to use the same design variable to multiple plies.

Simplified, I need several different plies to have the same thickness and I need several plies with diferent thickness aswell.

I formulated the problem this way and create a generic relationship to each ply, using only one design variable for multiple plies. This didn't work and appeared an error.

 

I checked the dlink card but I dont know if that fits my purpose because how can I link DVs in order to have the same value?

Any ideia on how can I do this?

 

Best regards,

Gonçalo