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Problem Optimization

User: "Altair Forum User"
Altair Forum User
Altair Employee
Updated by Altair Forum User

Hello everybody,

I'm trying to do a composite optimization following the tutorial that described a monocoque FSAE optimization; I made the first step (free size optimization) but when I try to edit the ply shape for manufacturability and I try to start the second optimization, I have an error:

 

 A fatal error has been detected during input processing:


  *** See next message about line 31 from file:
      C:/Users/Salvatore/Desktop/Altair ottimizzazione manuale/Ottimizzazione/Ottimizzazione con DOF
   'DESOBJ(MIN)=6'

  *** ERROR # 1041 *** in the input data:
  Card DESOBJ conflicting with previous DESOBJ, MINMAX, or MAXMIN data.

 

I noticed that after the first optimization are created automatically other objectives, other otpimization control, response and constrains; maybe they could be the cause of this error?

Thanks 

 

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    User: "Altair Forum User"
    Altair Forum User
    Altair Employee
    OP
    Updated by Altair Forum User

    Hi Salvinho,

     

    I think there are two objective functions. Can you please check this?

    User: "Altair Forum User"
    Altair Forum User
    Altair Employee
    OP
    Updated by Altair Forum User

    Hi Prakash,

    I resolved the problem: the second objective resulted because I loaded model and solver deck.

    I have another question...

    There is a method to optimize a monocoque with honeycomb core? I would to treat honeycomb as ply; it's possible?

    User: "Altair Forum User"
    Altair Forum User
    Altair Employee
    OP
    Updated by Altair Forum User

    Yes, you can treat the core as a ply using shell elements.

    User: "Altair Forum User"
    Altair Forum User
    Altair Employee
    OP
    Updated by Altair Forum User

    Thanks Prakash, but How  can I do to assign honeycomb material to shell elements?

    User: "Rahul Rajan_21763"
    Rahul Rajan_21763
    New Altair Community Member
    Updated by Rahul Rajan_21763

    Hi,

    For linear analysis honeycomb modelling as in core for composite analysis is usually modelled with SOLID elements with equivalent isotropic properties. The ply’s/laminae which are the face sheets on either side of the core are modelled with Shell elements (PCOMP/PCOMPG/PCOMPP) with orthotropic material property.

     

    Regards

    Rahul R

    User: "Altair Forum User"
    Altair Forum User
    Altair Employee
    OP
    Updated by Altair Forum User

    Thanks for reply :-)

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