Bolted/Compression Only Elements

[MrK159]

I need to model a bolt/pin in a 3D structure. I have been using RBE2 elements using a spider connection with a CBEAM element, however my problem is that if I bolt 2 parts together the bolt in reality should exert a bearing force on the connected parts. However the RBE2 elements will naturally push on one side of the hole and pull on the other side, this pulling action is unrealistic.

Does anyone know how to better specify a bolt, or to set the rigid elements to be compression only in a linear structural analysis in NX 8.0?

Thanks

 

[rb1957]

i'd model the way you've described. true the traction isn't real, but ...

if you really want to model it better, then you'd need to ue gap/contact elements between the bolt (RBE) and the hole side wall. in reality the bolt shank is slightly smaller than the hole bore.

another day in paradise, or is paradise one day closer ?

 

[MrK159]

Could the stress results in tension be simply neglected?

 

[rb1957]

the traction forces "infect" all of the hole surround material, but i'd be surprised if they are so different from any other stresses near the hole that they draw attention to themselves (so you'd need to ignore them).

another day in paradise, or is paradise one day closer ?