Machine Design
The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

(Kf - 1)/ (Kt - 1)
(Kt + 1)/ (Kf + 1)
(Kf + 1)/ (Kt + 1)
(Kt - 1)/ (Kf - 1)

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