Topology Optimisation & Stress Constraint

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

I am running a topology optimisation (minimising Mass) and have included a stress constraint on the design variable using the parameter selection.  Optistruct gives me a feasible solution, but when I look at the max Von Mises stress in the final iteration it is well above the upper bound I have specified for the stress constraint.

 

My problem requires plane symmetry and split draw but even without these additional factors the upper bound value does not appear to be constraining the stress

 

I get a similar result when I use Compliance as my objective function

 

Can anyone help??

 

 

 

For information:-

 

I have set up the model using the GUI, and the appropriate section of the *.fem file looks like

 

$HMNAME DESVARS        1DV1
DTPL    1       PSOLID  1      
+       STRESS  4.37+8 

 

and in the *.out file the 'Stress Constraints for Topology/Free-Sizing Optimization' is shown to be 'active' at each iteration

 

 

 

  

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2013

    having done some additional reading there is a suggestion that the Optimiser is aware of these 'singularities' and intelligently allows them to remain as long as they are near the edge (and thus can be smoothed out using shape optimisation).

     

    Might this be the answer to my own question?

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