Help with a bolted connection (pretensioned bolts, half symmetry and under thension

For Tied I am preparing the model. Trying it out.

For the surface interaction: type is Hard, and fric coeff is 0.1 and slope is 100000 N/mm³.

Try switching Hard to Linear and reducing the stiffness (K) by a few orders of magnitude. You can use this formula to estimate it: Snap-fit contact snagging problem - #17 by JuanP74 - Analysis issues - CalculiX (official versions are on www.calculix.de, the official GitHub repository is at https://github.com/Dhondtguido/CalculiX).

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Sure, I will try this and update you once I get some results for this.

Thanks for the quick response.