近年来,高速列车、汽车、航天器中的核心工程构件承受的疲劳循环已达108～1010周次甚至更高.目前的研究结果表明,高强钢材料在10 7周次以上的超高周疲劳阶段内仍会发生疲劳断裂,不存在传统的疲劳极限.因此,研究高强钢的超高周疲劳特性不仅有助于理解疲劳机理,而且有利于研究材料超高周疲劳设计及寿命评估方法.论述了高强钢超高周疲劳研究的背景和意义,介绍了近几年超高周疲劳的研究成果,包括S-N曲线的特征、裂纹萌生特征和扩展机理、断面上鱼眼形貌等,并给出了未来超高周疲劳的研究方向.
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