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Contact Types forPretensioned Bolts

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I am still working on pretensioned bolts.

I am not sure which contact types i should use for the pretensioning of bolts.

In the tutorial for pretensioned bolts is nothing said about it.

There is freeze contacts used everywhere, i think this is done to keep the computing time short.


Definition for the Contact (Altair Help article: "Contact"): "enforces zero relative motion on the contact surface, the contact gap remains fixed at the original value and the sliding distance is forced to be zero"


I think this behaviour is acceptable for the contacts 1+3, the contact of the thread and below the head of the bolt (please look at the attached drawing) but not for 2.

I tried different variations (tie, stick, slide) and the results for displacement change significantly!


Shouldn't it be some kind of frictional or slide contact for 2?


And what is about the orientation of the contact pushout force (morient)?

Leave it default? Or Norm?


Thank you.




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Contact between bolt nut and shaft should be bonded. But along the length the contact pair should be no seperation or frictionless which allows to slide the components relative to each other. 

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