Simulate bolt constraint

Altair Forum User

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:

<?xml version="1.0" encoding="UTF-8"?>

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"?>

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

thanks

Altair Forum User

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.