Drop-off Constraint

Altair Forum User

Hi,

 

I am running a composite optimization with Optistruct and I need to comply with a manufacturing rule of drop-off : when the total thickness of the laminate increases then the thickness of each orientation must not decrease.

 

Is it possible to set up this rule ?

 

Thanks,

Ludov

Altair Forum User

Hi Ludov,

 

Do you want to introduce drop off as a response constraint?

 

You can have ply drop off constraint for laminate composites on DISZE card.

Altair Forum User

Hi Prakash,

 

I believe that the ply drop off constraint PLYDRP is not useful to set up my manufacturing rule.

The picture below is an example of what I want to avoid in my optimization : the total thickness of the laminate increases while the thickness of the 45° ply decreases.

 

I have a limited knowledge about response constraints. Is it possible to set up my rule with DRESP, equations ... ?

<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

Hi Ludov,

Sorry for a late reply.

Do you have any balance constraint on your laminate for +45/-45 plies?

if not, can you introduce this and check if you are able to get the desired?

Altair Forum User

Yes, I have a balance constraint for +45/-45 plies.
My previous reply was an example that can be used with any plies.

By default the total thickness of the laminate can increase while the thickness of a 0° ply or 90° ply decreases. I don't believe that the constraint is implemented in Optistruct. Maybe if I use responses and equations it could be.