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文章分析了直径对应力集中系数的影响;绘出了M30以上及M30以下的S-N曲线,比较出了直径对高强螺栓强度的影响,通过断口分析阐述了数据离散的原因。分别把从低-高和高-低两种加载顺序的点汇成S-N曲线,得出了加载次序对疲劳强度的影响。从应力集中、直径和加载次序3方面系统分析了疲劳影响因素并提出了改善措施。
The influence of diameter on the stress concentration factor is analyzed. The S-N curve above M30 and below M30 is plotted. The influence of diameter on the strength of high strength bolts is compared. The reason of data discretization is expounded by fracture analysis. The S-N curves were collected from the points of low-high and high-low loading, respectively, and the influence of loading order on the fatigue strength was obtained. The influencing factors of fatigue are systematically analyzed from stress concentration, diameter and loading order, and the improvement measures are put forward.