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Simulate bolt constraint

I want to simulate in Hypermesh the constraint, in a cilinder, due to the presence of bolts. To do this I created a geometrical node in center of the cilinder with a constraint of all 6 DOF, and then used rigid element (RBE2) to connect the node with all nodes in the surface of the cilinder, as shown in this picture:

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results in Hyperview show a very strong vonMises stress in the external part of the cilinder. I think this result does not represent reality because the stress should be uniform along the bolt.

 <?xml version="1.0" encoding="UTF-8"?>post-37131-0-40080700-1432998307_thumb.p

there are other way to modeliza the interaction between structure and bolts?

thanks

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