中文摘要：

提出了采用名义应力法估算振动载荷下连接件疲劳寿命的方法。综合考虑连接件孔边的应力均方根集中程度、孔表面状况和填充系数的影响，给出了连接件在振动载荷激励下的应力均方严重系数，然后结合连接件孔边的动态特性给出了振动疲劳缺口系数的计算公式。设计并完成了两种激励谱下304不锈钢的连接件振动疲劳试验，结果表明该方法可以很好地预测连接件的振动疲劳寿命。

英文摘要：

A stress mean square severity factor of joints in vibration excitation was given aiming at fatigue life estimation problem herein .This stress mean square severity factor considered comprehen-sively the concentration degree of root mean square stress ,surface status and block coefficient at hole edge .Then a model was presented combining with the dynamic characteristics of hole edge .With this model ,the nominal stress approach of vibration fatigue life analysis of joints was obtained .A vibra-tion fatigue test was designed and carried out on 304 stainless steel .According to the results ,the method can predict the vibration fatigue life of multi-fastener joints well .