疲劳缺口敏感度（q）
\begin{align} \label{eq:15001a} q = \frac{K_f - 1}{K_t - 1} \end{align}
其中 —
| \( K_f \) | = 疲劳应力集中系数 |
| \( K_t \) | = 理论（静态）应力集中系数 |
q 的取值范围为 0（即 \( K_f \) = 1 时对疲劳强度无影响）至 1（即 \( K_f \) = \( K_t \) 时完全敏感）。
见 Campbell[1]，第 257 页（另见 Juvinall[1]，第 254 页）。
Fatigue notch sensitivity (q)
The degree to which a material's fatigue strength is sensitive to a notch (stress concentrator).
\begin{align} \label{eq:15001a} q = \frac{K_f - 1}{K_t - 1} \end{align}
where —
| \( K_f \) | = fatigue stress concentration factor |
| \( K_t \) | = theoretical (static) stress concentration factor |
q ranges between 0 (i.e., no effect on fatigue strength when \( K_f \) = 1) to 1 (i.e., full sensitivity when \( K_f \) = \( K_t \)).
See Campbell[1], p. 257 (also Juvinall[1], p. 254).