连接件振动疲劳寿命分析的名义应力法

中国机械工程 ›› 2014, Vol. 25 ›› Issue (18): 2519-2522.

连接件振动疲劳寿命分析的名义应力法

崔泗鹏1;姚卫星2;夏天翔1

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

出版日期:2014-09-25 发布日期:2014-09-26
基金资助:
国家自然科学基金资助项目(51275241)

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

Cui Sipeng1;Yao Weixing2;Xia Tianxiang1

1.Key Laboratory of Fundamental Science for National Defense-advanced Design Technology of Flight Vehicle,Nanjing University of Aeronautics and Astronautics,Nanjing,210016
2.State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics，Nanjing,210016

Online:2014-09-25 Published:2014-09-26
Supported by:
National Natural Science Foundation of China（No. 51275241）

摘要/Abstract

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。

关键词: 连接件, 振动疲劳, 应力均方严重系数, 名义应力法

Abstract:

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 comprehensively 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 vibration 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.

Key words: joint, vibration fatigue, stress mean square severity factor, nominal stress approach

中图分类号:

V211.7

崔泗鹏, 姚卫星, 夏天翔. 连接件振动疲劳寿命分析的名义应力法[J]. 中国机械工程, 2014, 25(18): 2519-2522.

Cui Sipeng, Yao Weixing, Xia Tianxiang. Nominal Stress Approach for Fatigue Life Prediction of Multi-fastener Joints under Vibration Loading[J]. China Mechanical Engineering, 2014, 25(18): 2519-2522.

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