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darioaresta

Simulate bolt constraint

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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:


post-37131-0-12631300-1432997870_thumb.p


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.


 post-37131-0-40080700-1432998307_thumb.p


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


thanks


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Hi Darioaresta,


 


When there is a change or deviation in the body, more stress will be seen at that areas (Stress concetration areas).


 


You can exclude a row of elements around the hole and post process for results.


 


Also, since RBE2s are stiffer elements and will not allows nodes to move relatively. Instead use RBE3 elements.


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