semi rigid connections
semi rigid connections
(OP)
Hi all
I have to model bolds which connect two parts of an assembly and I am thinking of using rigid elements or modelling the bolts with a beam and rigid elements, therefore I would get rigid joints.
I would like to have a semi rigid connection instead of a rigid one.
How can I model a semi rigid connections between two or more parts using FEMAP?
Thanks
ingroma
I have to model bolds which connect two parts of an assembly and I am thinking of using rigid elements or modelling the bolts with a beam and rigid elements, therefore I would get rigid joints.
I would like to have a semi rigid connection instead of a rigid one.
How can I model a semi rigid connections between two or more parts using FEMAP?
Thanks
ingroma





RE: semi rigid connections
However if you are not really interested in local stresses then rigids may be OK.
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: semi rigid connections
are they discretely bolted together ? welded ?
RE: semi rigid connections
thanks
RE: semi rigid connections
Instead of using rigids, you may want to use springs (which can also be beams using a stiffness of AE/L -- area * modulus / length).
You may want to search for a paper called, "Method of Modeling Bolts" by Jerome Montgomery and "Influence of Fastener Flexibility on the Prediction of Load Transfer and Fatigue Life for Multiple Row Joints" by Huth.
Garland E. Borowski, PE
Engineering Manager
Star Aviation
RE: semi rigid connections
You might also find that you have no choice but to explicitly model the bolted joint with 3D elements and run a contact analysis.
FEA is somewhat of an art, and it is often not a one shot deal. Try modeling your structure a couple of different ways and then look at what the results are.