Results don't look correct

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hi, 

 

I've been running optistruct analysis on a cad model and the results that I am getting don't look correct. 

 

I've tried many different ways of fixing this, such as changing the mesh or applying the force acting upon it in a different way but the results are still coming back with hardly any material left on the part.

 

I have attached two files showing what I input into optistruct and the other showing the result I get back from optistruct in it's final iteration.

 

I'm not sure about what I have input wrong, could someone please help me?

 

Thanks, 

Alasdair.

 

<?xml version="1.0" encoding="UTF-8"?>post-39115-0-59201900-1440697473_thumb.j

<?xml version="1.0" encoding="UTF-8"?>post-39115-0-61060800-1440697474_thumb.j

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited August 2015

    Hi,

     

    Could please share the .fem file using below ftp link.

    https://ftam1.altair.com/filedrop/rahul.rajan@altair.com

    Will have a look in to your model & suggest.

     

    Regards

    Rahul R

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2015

    Hi homedogally,

     

    From the model, I can see that loads and BCs are applied on the design space.

     

    It is not recommended to have loads and BCs on design space. Study the model and make few non-design segments.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2015

    I'm not really sure of how to apply the load and the BCs a non design segment, would you be able to give me instructions on it?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2015

    I applied the load and BCs to a separate nondesign component but I know get error 1000: incorrect data in field # 3.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2015

    Hi, 
     
    I followed the instructions and added the load and BCs to a non design segment but I am still getting the same problem.

     

     

    <?xml version="1.0" encoding="UTF-8"?>post-39115-0-75088500-1440788876_thumb.j

    <?xml version="1.0" encoding="UTF-8"?>post-39115-0-47703800-1440789124_thumb.j

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2015

    HI homedogally,

     

    In HyperView>>ISO contour panel, play with the ISO value (shown in red in the attached image).

     

    Start from 0.2 and check whether you have a desired topology.

     

    If you are still not happy with the topology results, then try adding manufacturing constraints to your model and run the analysis.

    <?xml version="1.0" encoding="UTF-8"?>post-7616-0-06633600-1440994072_thumb.jp

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2015

    Hi,

     

    Even at 0.02 the topology looks wrong.

     

     

    <?xml version="1.0" encoding="UTF-8"?>post-39115-0-95827800-1441047441_thumb.j

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2015

    Hi,

     

    Try adding manufacturing constraints and play with the responses in your model setup.

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