von mises stress in lattice opti.

Aslan_20882
Aslan_20882 Altair Community Member
edited October 2020 in Community Q&A

Hı,

 

I want to create stress restriction in lattice optimization. So  I am changing the value in the image below. But I do not see any change when I check the analysis results. (von mises).

 

Can you help me?

 

 

image.png.a6921580332e6effc6b0b9048699bbf0.png

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    Hi @Busra ASlan

     

    Can you try in phase 2 of lattice optimization instead of phase 1

     

    Provide a stress constraint in phase and check if that helps. 

  • Aslan_20882
    Aslan_20882 Altair Community Member
    edited April 2018

    Thank you for your answer.

     

    But the same error occurred when I resolved it again.

     

    I share my files with you.

     

    Can you check?

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    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 November 2020

    Hi,

     

    Sorry for a late reply. Stress constraint on latticeworks a little different. 

     

    Here is a doc which helps with stress constraint.

     

    Unable to find an attachment - read this blog

  • Aslan_20882
    Aslan_20882 Altair Community Member
    edited April 2018

    Hı @Prakash Pagadala,

     

    Thank you for everything.

     

    I understand, Stress constraint has little effect for lattice structure.  When I examine lattice type (1, 2, 3, 4) seems to have little an effect. Ok, then which parameter should I use for the changes analysis result aside from lower and upper bound lattice.

     

     

    I tried stress constraint for topology optimization, but I still can not see any changes. Analysis----optimization---topology---parameters---stress constraint...

     

    As I change stress constraint have to change element stress and displacement values, is that correct   ?

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    Hi @Busra ASlan

     

    During topology the stress constraint may or may not have any effect during the first phase.

     

    In order to have a better concept, try with compliance and volume fraction and in phase two stress constraint can be added. 

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