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受传统试验方法的限制,结构材料的疲劳研究范围常限于107周次以内.然而,过去十年出现了一系列意料之外的破坏事件,尤其是对于认为具有明显疲劳极限的钢铁结构部件.因此,对于不同材料达到1010周次的超高周疲劳行为的研究引起了广泛关注,尤其是近年来成为了热点.本文综述了结构金属材料超高周疲劳的研究现状并介绍了其基本方面.主要内容包括:加速疲劳试验方法的发展与应用、超高周疲劳引起的内部断裂的裂纹萌生机制与扩展特征、S-N曲线的形状特点、疲劳极限存在性及其预测、加载频率和环境及表面状况的影响等.在此基础上提出值得进一步研究的一些方向.
Due to the limitations of traditional test methods, fatigue studies of structural materials are often limited to less than 107. However, a series of unexpected failure events have occurred over the past decade, especially for steel structural components that are considered to have significant fatigue limits. , The research on the ultra-high cycle fatigue behavior of different materials up to 1010 weeks has attracted much attention, especially in recent years has become a hot spot.This paper reviews the research status of the ultra-high cycle fatigue of structural metal materials and introduces its basic aspects. The contents include: the development and application of accelerated fatigue test method, the mechanism of crack initiation and propagation of internal fracture caused by ultra-high cycle fatigue, the shape characteristics of SN curve, the existence of fatigue limit and its prediction, loading frequency, environment and surface conditions Influence, etc. Based on this, some directions worthy of further study are put forward.