Discussion
A detail has \( K_t = 3.0 \) and a notch sensitivity of \( 0.8 \). Its fatigue notch factor is
Answer: A
Correct answer: 2.6
\[ K_f = 1 + q(K_t - 1) = 1 + 0.8 \times 2.0 = 2.6. \] The notch sensitivity \( q \) lies between zero and one and measures how nearly the material feels the full elastic concentration. At \( q = 0 \) the notch has no fatigue effect at all; at \( q = 1 \) the fatigue factor equals the elastic one. Coarse-grained and ductile materials tend to have the lower sensitivities.
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