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Interpreting results

Question asked by Koel Abell on May 30, 2008
Latest reply on Jun 2, 2008 by Bill McEachern
I've modeled a 1/2-20 Gr.5 bolt. My test ran with the threaded end of the bolt fixed, while loading the underside of the bolt head to the manufacturers specified bolt preload of 12,360 lbs.

The results show stresses at the shank to bolt head fillet at around twice the ultimate strength of the bolt material.

Obviously real bolts will not "fail" at this preload so what are the results telling me?

When I run fatigue studies of my assembly using these bolts with the prescribed preload, I get cycle lifes of only around 100.

Thanks for any and all help.