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Sandwich Analysis

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

Hi There , 

I'm engaged in the project of chassis design for a vehicle for the FSAE competition and i have to make the chassis with a sandwich (CFRP - Foam) material , since hyperworks (OPTISTRUCT) will  help doing the analysis , i started making a plate and making plies with CFRP (MAT8) and PCOMPP card image then a Core(MAT1)  with PSOLID property , also i make laminate with the plies . i applied the load with constrains then loadstep with both and i check CSTRAIN and CSTRESS Properties for the analysis but since i start the analysis there is no iterations made and only the one displacement result appear , i tried alot to change in the structure but still no iterations , 

Here is what i have and there is a copy of the hm file attached 

 

The Results 

 

Iteration Subcase     Variable  Grid/Elem ID   Value
---------------------------------------------------------
   0    1 MaxDisp                    12205  -0.285887E-02
   0    1 MaxStress                   5725   -15.0120    

 

The amount of memory allocated for the run is 331 MB.
 This run will use in-core processing in the solver.

 ANALYSIS COMPLETED.


 ==== End of solver screen output ==== 


 ==== Job completed ==== 

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

    Hi mmramadan,

     

    The analysis is completed and you can view the results.

     

    I don't see any errors 

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

    Thanks prakash , but  why i can't see more than one iteration for the analysis ?!

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

    Yes, because you are only running analysis and not optimization, ryt?

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

    I've changed only the magnitudes of the loads and then when i run the optimization analysis i got the same thing again , i attached an image of the results also

     

    Iteration Subcase     Variable  Grid/Elem ID   Value
    ---------------------------------------------------------
       0    1 MaxDisp                    10854   0.185177    
       0    1 MaxStress                  13171  -0.115659E+07

     

    Optimization.png

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

    Hi,

     

    Can you share the model files please?

     

    Use the dropbox link in my signature below to share the files.

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

    Done

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

    Hi,

     

    I have your model with me but I dont see any optimization parameters in your model. So that is why only analysis is done instead of Optimization.

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

    So please could you give me an example to apply an optimization parameter 

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

    Hi,

    Did you define any Design variable , design Response , design constraint or Design Objective?

    If not please refer Optistruct optimization tutorials.

     

    Regards

    Rahul R

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

    Hi mmramadan

    i am designing a chassis for FSAE competition in China.

    i think i am facing the same problem with yours and i do not know how to solve this.

    could you please tell me how did you solve your problems 

    thanks for the help:)

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

    Hi @ISAJIONG

     

    Can you please brief the problem you are facing?