NX 10 Durability and Fatigue

[Klaus800]

Hallo everybody,
I have question about input data for liftetime calculactions (Durability/Fatigue) -
Describes the factor K (Surface Factor) the influence of the surface on the fatigue endurance?
Thanks and Regards
Klaus

 

[Belgiancadengineer]

Fatigue is strongly affected by surface finish since most cracks will initiate on the surface and will often be the leading cause of the fatigue failure. I am not sure but I think it is just a safety factor kind of thing, it just decreases the allowable max value by a certain percentage. (i.e. 0.7)

It reminds me of kinematic hardening, it's the same idea.