that last post reminded me of something. Airplane structures (wings specifically) are subject to varying loads. Unlike fuselages, which see a pretty consistent cyclic load, wings react a highly variable load (due to gusts). Now whilst even the high gust loads don't induce a plastic stress they do have a significant effect on the response to the smaller gust loads (what we call retardation, as it relates to crack growth). We don't call this HCF or LCF, its just "fatigue" to us.
The point is that if your component is subject to frequent low loads and occasional high loads, then Miner's rule is very conservative.
another day in paradise, or is paradise one day closer ?