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How does Bolt Pre-load work?

Valued Contributor
Valued Contributor

Dear Experts,

 

how is the solution for a bolt pre-load approached/implemented in Nastran?

 

I read there are different approaches on different sites regarding bolt pre-load in general and used with other software:

 

"Pretension can generally be modeled with temperature, constraint equations, or initial strains."

Source: Methods for Modeling Bolts in the Bolted Joint

 

What is used for Nastran if I apply a bolt pre-load to an 1D-Element or a cut-plane?

 

Where can I read more about it?

 

Kind regards.

4 REPLIES

Re: How does Bolt Pre-load work?

Solution Partner Valued Contributor Solution Partner Valued Contributor
Solution Partner Valued Contributor
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Re: How does Bolt Pre-load work?

Siemens Phenom Siemens Phenom
Siemens Phenom

The above link describes how to apply the preload in Simcenter.

 

For solver documentation see here:

 

Linear Solutions (101, 103, 105, 107-112):

https://docs.plm.automation.siemens.com/tdoc/nxnastran/12/help#uid:index_User:id505931:id677877

 

Multi-Step nonlinear (401):

https://docs.plm.automation.siemens.com/tdoc/nxnastran/12/help#uid:index_multi_step_nonlinear:xid119...

 

 

Re: How does Bolt Pre-load work?

Valued Contributor
Valued Contributor

Thanks everyone!

 

@JimB
"Historically, bolt preload was modeled using either an equivalent thermal load approach or a multipoint constraint (MPC) approach." Bolt Preload

 

I know the first (thermal load approach), but not what is meant by a MPC approach.

 

Is anyone so kind to provide further details?