Abstract The paper analyzes the scale hierarchy of transitions from very high to high and low cycle fatigue which are taken as fatigue limit according to the Wöhler concept. The analysis shows that the life distribution in the transition range 10 6 –10 8 cycles is multimodal. From relations between the fatigue limit σ –1 and mechanical characteristics σ U and σ 0.2 in aircraft materials based on Fe, Al, Mg, Ti, and Cu it follows that σ –1 depends on σ U and σ 0.2 and the ratio σ –1 /σ 0.2 depends on σ 0.2 /σ U . As σ –1 /σ 0.2 increases, the complete diagram of three fatigue scales degrades. The transition from very high to low cycle fatigue goes without high cycle fatigue at σ –1 /σ 0.2 ≥ 1.

中文翻译：

---

金属疲劳极限量表

摘要 本文根据Wöhler 概念分析了从极高周疲劳到高周疲劳和低周疲劳转变的尺度层次，并将其作为疲劳极限。分析表明，10 6 –10 8 个周期的过渡范围内的寿命分布是多峰的。从基于 Fe、Al、Mg、Ti 和 Cu 的飞机材料的疲劳极限 σ –1 与机械特性 σ U 和 σ 0.2 之间的关系可以得出，σ –1 取决于 σ U 和 σ 0.2 以及比率 σ – 1 /σ 0.2 取决于σ 0.2 /σ U 。随着 σ –1 /σ 0.2 的增加，三个疲劳等级的完整图降级。在 σ –1 /σ 0.2 ≥ 1 时，从非常高周疲劳到低周疲劳的过渡没有高周疲劳。