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Problem with shell structures. Picture frame test

Problem with shell structures. Picture frame test

Problem with shell structures. Picture frame test

Hello, I'm new to Abaqus and i've encountered problems modelling a shell subjected to a picture frame test.
What I have been trying so far is to prescribe the shell edges as rigid and make them move, but with no success so far. I would like to know if anyone could help me, i know there must be a simple solution to this problem, but as I said I'm new to this modelling program.

I will attach some images of what I want, but I just want to model the fabric, and not the whole contraption. Basically it's a shell that is suposed to be tensioned on oposite corners and making the other two corners "compress" finally resulting in wrinkles in the shell ( what I'm studying). For some reason I canĀ“t make the edges rigid, but able to rotate between them, as it would happen in the test I'm simulating if I were to apply a displacement in the upper node.

Thank you in advance for your help.

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