Why von-Mises will exceed stress constraint

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

I am doing the example of stress constraint of Hook

 

like this link : https://connect.altair.com/CP/SA/training/self_paced/optimization/content/opt3/pdf/ex1b.pdf

 

I want to konw why I set the stress is 120MPa

 

at the result stress will exceed at the design region but when I pick all region (contain non-design region) it will not exceed like this photo

 

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and I want to know the stress constraint is constraint the von-Mises stress? 

 

 

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    Hi,

     

    The stress target in topology optimization is applied globally to the model (including non-design space). Please refer to the online help for the DTPL card (especially comment #1). It is through the DTPL card and not a DCONSTR
    From FAQ section of help:
    The stress constraint definition in a topology optimization is a global constraint and does not target local stress concentrations. These areas can be addressed subsequently through size, shape, and free shape optimization or a combination thereof. Artificial stress concentrations are filtered out during topology optimization with stress constraints.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018
    Altair Forum User said:

     

    at the result stress will exceed at the design region but when I pick all region (contain non-design region) it will not exceed

     

    @Prakash Pagadala

     

    really thanks to you!

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