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Fatigue Damage - Steinberg vs. Narrow Band - which one is pessmistic?

Thread starter JBlack68
Start date Aug 14, 2018

Status: Not open for further replies.

Aug 14, 2018

JBlack68

Aerospace

To all,

Consider the formula for fatigue damage formula using Steinberg (ST) and the Narrow Band(NB)
Has anyone ever plotted the ratio D_NB/D_ST as a function of the SN curve exponent (b = 3..13)?
If I got this right (and I am not sure I have hence the question!) the ST method is predicting higher damage (pessimistic) up to b~7.55

Thanks
Regards