Combining reponses from different load cases
Hello,
I'm running a 'size optimization' of a structural model (static linear analysis). I would like to combine responses coming from 2 different load cases (load set) and create a constraint based on this combined response.
Is it possible to do that with optistruct ?
Thank you,
Jérôme Puech
Answers
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Yes, it should be possible in most circumstances, it depends on what exact responses you want to combine as to how you would achieve it
What are the responses you want to combine?
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I want to combine CBAR elements static stresses (end A and
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You should be able to use DRESP2 for that
To extract either the max, min, sum, average etc of them
What is the purpose of combining the stresses across 2 cases though? If the loadings are different, how do the 2 combine?
You could more simply/easily just define 2 constraints for the optimisation (one for each case)? Unless the constraint is truly a combination of results from both.
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My goal is to compute a fatigue margin, so I want to extract the maximum stress from one load case, then minimum stress from the second case and then make a ratio between those 2 stresses. Then I want to use this ratio as constraint for the optimization
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Ah, ok, DRESP2 should allow you to achieve that I think
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OK, I'll try that
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