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Freebody and Bolt Preload

Legend
Legend

Hello,

 

I made a simple model of bar elements and in the midle I used on an element 1000 N bolt preload and constrained both ends. After running the analysis I created freebodies:

 

Freebody_BoltPreload.jpg

 

All reaktion forces and internal forces are 1000 N except of element with bolt preload. On this element I got 12000 N (in reversed direction).

 

What is this 12000 N, which value?

 

I attached the model too.

 

Best regards

 

Peter Kaderasz