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Hi, The problem was about the MSC Nastran version. This kind of response is active only in recent versions. Hope this will be usefull to somebody else. Best regards.

Hi, I'm using the sol 200 MSC Nastran to do a sturctural optimization. My model is made up of PSHELL and PBARL elements and the goal is to minimize the weight of the structure. To do this I've utilized the DRESP1 WEIGHT for all the structural weight,as a objective function, but since in my model...

Yes there was the error you wrote. And the problem was exactly that one you told me. In my Command section there was another output for the FORCE sets to BILIN. Now evrything is ok and the stress item code on the response (DRESP1) is that one I want. Thank you very much for your help!!! Best...

Hi, thank you for the reply. I've change the options but this is not the problem. I've noticed that the problem is when I define the stress item code for the CQUAD4. I want to constraint the von mises stress but even if I use the correct item code nastran reads the constraints for the principal...

Hi, unfortunatly I can't show you the f06. If I understood correctly my response for the CQUAD4 is not for the von mises stress but for the principal stress(even if I've used the correct stress item code). My model is made up of PSHELL(CTRIA3 and CQUAD4) andPBARL(CBAR) elements. and for those...

Hi, I'm using MSC Nastran to do a structural optimization with sol 200. My model is made up of PSHELL(CTRIA3 and CQUAD4) andPBARL(CBAR) elements. I've defined von mises stress responses by DRESP1 entry and I've linked them to the DCONSTR enty becouse I don't want elements overrides 233 MPa...

Hi, I'm using the sol 200 for a structural optimization but I have problem with the stress responses. I've used four type of DRESP1: 1) DRESP1 198 S198 STRESS PSHELL 9 198 2)DRESP1 1198 S198 STRESS PSHELL 17 198 3)DRESP1...

Hi, I've done a structural optimization with sol 200 of Nastran. In my model I've imposed stress constraints using the DRESP1 and DCONSTR cards. So, I've runned the model first whit Nastran NX and after with MSC Nastran. The two f06 are different, I imagine becouse they utilizes different...