Fatigue life prediction is important in engineering design to ensure structural reliability. However, it is difficult to achieve an accurate fatigue life prediction from a smooth specimen to a notched specimen with the traditional Highly Stressed Volume (HSV) method, as it is based on just one empirical evaluation of the HSV. A modified HSV method is proposed in this study, which is combined with the concept of critical distance, and the critical crack size of smooth specimens is obtained by observing the fracture surface. The predicted P-S-N curves of single-notched specimens and multi-notched specimens show a good agreement with experimental data compared with the traditional HSV method and the Theory of Critical Distance method.

疲劳寿命预测在工程设计中具有重要意义，可确保结构的可靠性。然而，使用传统的高应力体积 (HSV) 方法很难准确预测从光滑试样到缺口试样的疲劳寿命，因为它仅基于 HSV 的一次经验评估。本研究提出了一种改进的HSV方法，该方法结合临界距离的概念，通过观察断口得到光滑试样的临界裂纹尺寸。与传统的HSV方法和临界距离理论方法相比，预测的单缺口试件和多缺口试件的PSN曲线与实验数据吻合较好。