Thank you for your answer!
I turned off stiffness updating and this is the new graph for the bolt adjustment:
Contact settings for normal:
Thread is Bonded-MPC and frictional contacs have frictional coefficient 0,1 and a penetration value of 0,04.
In the following in changed the penetration value and compared the bolt adjustments (For comparism I changed one time also the penetration factor to 0,1):
For this test, there is just the preload (48458N) and no working load. Reason for this is that I want to measure the deformation/resilience of the bolt and compare it with the calculated value.
Thank you for your help!
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