dear collegue
have you ever tried to compare the stress-life approach with the strain-life?
I was experimenting with some students using the website https://www.efatigue.com/ with normal notches
and normal materials included in the web site database.
It seems that a greater life results with the strain life of a factor 3 - 10.
More details and some discussion are at http://imechanica.org/node/22903
If your structure supports a fixed load, Stress-Life is more appropriate. If your structure suffers a fixed cyclic displacement, Strain-Life is better. In my experience, Strain-Life did not address the duty cycle I had to consider (fuel filled pressure vessels on airplanes) and would have lead to wildly inappropriate predicted life of my structure.
dear Doug Hall I suspect in many cases, the remote nominal load is low enough that you can confuse stress or strain control. It is at the notch root that you may not distinguish well, where strain-control is supposed to occur exactly because of elastic surrounding imposes (elastic) strains which need to be compatible at the root.
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