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Bolt thread fatigue

Question asked by Bence Rivasz on Jul 27, 2017
Latest reply on Jul 28, 2017 by Naga Ranjith Kumar Addagalla


Im a little bit confused and i cant find answer: How is it possible to set up an accurate fatigue simulation for a threaded bolt connection?


Problem: The bolt has a standard Torque, but with this load the firs roots of the thread go far over the yield strenght what is alredy unaccaptable for fatigue.

After the constant preaload should come the axial dynamic load  (arrow, see picture)

Is there a special evaluation for these Problems?