Composite failure constraints

SSnell

Hi, I'm optimizing a composite model and I want to constrain the failure.
I created the composite failure response and then created the constraint applied to all of my loadcases with an upper bound of 1.

I don't see CFAIL as an output option in control cards so added CFAIL(ALL) = ALL to the .fem file or in CASE_UNSUPPORTED_CARDS  in control cards.

Observing the results in hyperview show that only ply failure is observed by the optimization and that bond failure is not.

Is there a different form of  failure constraint that would allow the optimization to adhere to bond failure as a constraint?

 

Thanks,

Altair Forum User

Hi,

 

Can you try CFAILURE instead of CFAIL as shown in the image below, please?

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

SSnell

My mistake, I meant to say *CFAILURE in my original post, that's what I have been using. is there another constraint to make bond failure a constraint?

Altair Forum User

Hi SSnell,

 

there is only composite failure available.

 

I will check if there is a work around to use bond failure as a response and will get back to you soon.

Altair Forum User

BTW, which failure criteria are you using for your analysis?

SSnell

Thanks a lot for the reply, I'm using Tsai-Wu, the failure response is composite failure, and The upper bound for the constraint is 1.

A work around for bond failure would more than answer my question. Thanks