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topology optimization with multiple load cases

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Dear all,


I am running a topology optimization, but I want to consider multiple load cases at once and not each one separately.

Is that possible? How can I insert all the load cases (five) and only solve one optimization considering all of them?


Thank you in advance

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Thank you!!


So I create the response "weighted compliance" and, in my case of 5 load cases of equivalent importance, I set each weighting factor to 0.2, correct?


And then as usual in the objective I set minimize the weighted compliance, correct?


Thank you!

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Thank you for your answers...last question.


What would be the best approach if I want to:

  • minimize the volume of the model (or the mass) with multiple load cases and
  • and as constraint use the static stress

Is there a possibility? Or how would you suggest to run the optimization?

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Hi Mike,


Stress as a global response with mass or volume response is not recommended


from OptiStruct help:

It is not recommended to use the global stress constraint along with a mass/volume constraint. The constrained mass/volume may not allow the stress constraint to be satisfied.


To start of with, Try with Complinace as objective and volume fraction to get  a concept and further you can fine tune the design for stress and other parameters.


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I have a design that is made of several 1D bar elements (about 15) of circular cross section.

I now want to perform a size optimization on the cross section radius of these beams.

I have multiple load cases (3)!


I would like to minimize the mass and subject the stress.


How should I do that?


Thank you



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