(装甲兵工程学院 装备再制造技术国防科技重点实验室，北京 100072)
摘 要: 超高周疲劳是指材料经受1×107循环周次以上而发生断裂损伤的疲劳行为，彻底打破材料“无限寿命”的传统观点，逐渐成为疲劳研究领域一个新的热点问题。回顾近几十年国内外的研究成果，总结了超声疲劳试验方法的进展和应用，分析了金属材料超高周疲劳S-N曲线的典型特征以及内部断裂的裂纹萌生机制和扩展特征，探讨影响超高周疲劳行为的主要因素，即加载频率、材料组织和氢含量。在此基础上，提出了今后超高周疲劳研究的一些方向：裂纹源表面萌生和内部萌生的竞争性机制及影响因素，超高周疲劳的寿命预测和再制造零部件的超高周疲劳行为。
关键字: 金属材料；超高周疲劳；超声疲劳试验；S-N曲线；失效特征
（National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China）
Abstract:The very high cycle fatigue (VHCF) regime is defined as where the cyclic of structural component is greater than 1×107 load applications, which thoroughly breaks the traditional concept of infinite life. The fatigue behaviors in the VHCF range is becoming a hot subject in the research field. The research achievements on the VHCF in the past decades were reviewed. The development and application of ultrasonic fatigue testing were summarized. The typical characteristics of S-N curves and the basic understandings of cracking initiation and propagation were analyzed. The influential factors for VHCF mainly including load frequencies, microstructure and hydrogen contents were discussed. In addition, some possible and prospective topics of future researches were proposed.
Key words: metal material; very high cycle fatigue; ultrasonic fatigue testing; S-N curve; failure characteristic
