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.

RAMGANESH

Dear Prakash,

 

Can we generate spring connectors and apply the stiffness of the bolt instead of RBE2 & RBE3 elements???

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