Unified treatment of deep and shallow notches in rotating bending fatigue
Unified treatment of deep and shallow notches in rotating bending fatigue
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DOI：
10.1520/stp23214s
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
H. Nisitani;M. Endo
中科院分区：
文献类型：
--
作者：
H. Nisitani;M. Endo
作为对缺口构件的强度评价有用的概念，提出了“线性缺口力学”。这个概念解释了小规模屈服条件下缺口根部附近的弹塑性行为仅由最大弹性应力 σ m a x 和缺口根部半径 p 控制，与其他缺口几何形状无关。为了证实“线性缺口力学”在疲劳问题中的有效性，对具有广泛变化的缺口几何形状的缺口钢样本进行旋转弯曲疲劳试验。此外，还讨论了深度为晶粒尺寸量级的极浅缺口的疲劳缺口效应。总结目前的研究，提出了疲劳缺口效应的统一治疗方法。
As a concept useful for evaluating the strength of notched members, "linear notch mechanics" is proposed. It is explained by this concept that the elastic-plastic behavior near the root of a notch under the condition of small-scale yielding is controlled by the maximum elastic stress σ m a x and the notch root radius p alone, independently of the other notch geometries. In order to confirm the effectiveness of "linear notch mechanics" in fatigue problems, rotating bending fatigue tests are carried out on notched steel specimens having widely varying notch geometries. Moreover, the fatigue notch effects of extremely shallow notches, whose depths are of the order of the grain size, are also discussed. Summarizing the present studies, a unifying treatment of fatigue notch effects is presented.