Hy,
I would like to calculate a special safety value from stress responses, and using it in topology optimization.
The test of this calculation is started with a simple problem.
DRESP1 case 1:
- constaint: DRESP1 (von mises stress response, one selected element)
- objective: DRESP1 volume
DRESP2 case 1:
- only response: DRESP1 (von mises stress response, one selected element)
- constaint: DRESP2, (equation response) is calculated the following equation a(x)=x and using the DRESP1 von mises response
- objective: DRESP1 volume
In this case the changes on design variables are the same, and the results are the same. 
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Than i changed the response element quantity to 2 and the DRESP1 and DRESP2 case results are different
I have tried to change constraint screening, nothing has changed
I have tried to look on sensitivity values, but no stress values included in *.asens files or *_topol.h3d files
I have tried to compare it with displacement response/constraint and they are good, so the DRESP1 and DRESP2 with 2 response nodes has the same results.
Is this problem connected to Stress-NORM aggregation ?
How can i turn ON Stress-NORM aggregation in DRESP2 case?
How can i examine the stress response sensitivities?
Did i miss someting in the setup?
I have attached the 2 different *.hm and *.fem files
Thanks,
CSR
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