Abstract：Fatigue notch factor Kf is usually used to express the reduction in fatigue strength of the component notch.The factor of Kf is very useful in fatigue design.In this paper analysis for many fatigue limit of aluminum alloy,titanium alloy and steel with stress ratio of 0.5,0.06,-1 showed that the relation between most of Kt and Kf is linear except some case.The relation of Kf and Kt not only depends on the kinds of material but also on the stress ratios.
 赵名泮.应力疲劳分析手册[M].北京:科学出版社,1987.8.  赵少汴.抗疲劳设计[M].北京:机械工业出版社,1994.1.  吴学仁.飞机结构金属材料力学性能手册[M].北京:航空工业出版社,1996.6.  MAKKONEN M.Notch size effects in the fatigue limit of steel International[J] Journal of Fatigue,2003,25:17-26.  GEORGE K HARITOS,THEODORE NICHOLAS,DAVID B LANNING.Notch size effects in HCF behavior of Ti-6Al-4V l[J].Journal of Fatigue,1999,21:643-652.  HB5287-96,金属材料轴向加载疲劳实验方法[S].