Bolt with both constraints and force

Unknown

Hi there,

 

I'm wondering what's the best way to model a bolt in Hypermesh considering that it's constraining the model and also has the bolt tension force applies.

If I model it the usual way, with RBE2 elements, and constrain the center node, I can't apply a force to this node because it won't do nothing (it's displacement is equal to 0, the analysis is linear with [K]{u}={F}).

 

I've searched this topic online and didn't find anything using a bolt both to constraint and apply a force. Should I use the wsher area to apply the force and the edge nodes connected to a RBE2 and constrained in the center node?

 

I'm modeling a wheel. I have the forces applied in a node simulating the contact patch and connected to the wheel using RBE3 elements and constraints in the bolts connecting to the hub. I'm trying to find the best way of applying the bolt tightening forces to the model.

 

Thanks a lot,
Rodrigo Monteiro

Adriano A. Koga

hi /profile/47601-rodrigofst/?do=hovercard' data-mentionid='47601' href='<___base_url___>/profile/47601-rodrigofst/' rel=''>@RodrigoFST

 

You're looking for bolt pretension analysis, correct?

There are a few tutorials in OptiStruct help for that.

Take a look at the attached model.

 

In your case, you can create a 1D bolt, using beam elements, constraint one side of it with SPC, and on the other end, fix it to your model/washer.

Then you will create a 1st loadstep for the pretension only, and continue it (STATSUB_PRETENS + CNTNLSUB) for a subsequent nonlinear loadcase.

 

Unable to find an attachment - read this blog

Unknown

Thanks for your answer!