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smare104

response to sum up element stresses

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I need to define a response to sum up the stress values of all the elements in a component. What is the best way to do it? 

How the design equation should be defined?

 

Thanks,

Soraya

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Hi Soraya,

 

You can use external response (DRESP3) to sum stresses.

 

Please refer to Size Optimization using External Responses (DRESP3) example. 

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Hi Soraya,

 

I know this dates from quite a while, but is there any chance you've found a solution to your problem ? I am facing the exact same issue with Optistruct at the moment as I am trying to have a Stress-based aggregation function as my optimization response, but all of my efforts with DRESP2 have been fruitless so far. I am trying to code an external function using DRESP3 at the moment but I am not really sure how to do that, given that my input response is the static stress >  Von Mises one (which is a vector of the stress for each of the 100+ elements in the element set my response is defined on). I would really appreciate it if you could tell me of any workaround you've used to solve your problem.

 

Thanks in advance

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