连接件振动疲劳寿命分析的名义应力法  

Nominal Stress Approach for Fatigue Life Prediction of Multi-fastener Joints under Vibration Loading

作　　者：崔泗鹏[1] 姚卫星[2] 夏天翔[1] 

机构地区：[1]南京航空航天大学飞行器先进设计技术国防重点学科实验室,南京210016 [2]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016

出　　处：《中国机械工程》2014年第18期2519-2522,共4页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(51275241)

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。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 .

关 键 词：连接件 振动疲劳 应力均方严重系数 名义应力法 

分 类 号：V211.7[航空宇航科学与技术—航空宇航推进理论与工程]