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Shape optimization

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I made shape optimization in Optistruct, Shape 1 is undercut at one level, shape 2 is undercut higher. I want to check optimum high from stresses perspective. In optistruct gradient method MFD its working. I wanted to use GA algorithm in hyperstudy to check difference. 

I defined model, resource as hm file, solver input as fem file. Solver optistruct.

Now, I input variables, there are that two shapes. Should i pick them both? What about response? Should i find h3d which hyperstudy made and define element number and it stresses? can i pick global stresses?

I am not sure how hyperstudy will change high of that cutout, how to define that to have min stress in results.






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