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load displacement, shells are not parallel

Hallo ，

I have a question.

I loaded the displacement, but I don't know, why the upper and lower shells are not parallel ？

the contact has no problem.

How can I fix it?

Thank you very much!

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English

OptiStruct

Which verion of HyperView and Optistruct you are using?If possible please share .out file of the run.

Hallo ,

Hyperworks 2017.2 student edition and Hypermesh 2017.2

All the out files are in the attachment.

Thanks

you should constrain the rigids on top and bottom plates also in rotational degrees of freedom (DOF 4-6).