| 摘要: |
| 针对螺栓连接结构在横向振动下的失效问题进行试验研究，首先,对比相同条件下普通螺母与防松螺母的失效过程，结果表明普通螺母仅出现松动失效，而防松螺母会先出现部分松动，再因螺栓根部疲劳断裂而完全失效。同时在不同类型防松螺母中，Hard-lock螺母和施必牢螺母防松效果明显优于其他防松螺母。其次，考察拆卸次数、振动频率、幅值等因素对螺栓连接失效的影响规律，发现多次拆卸会改变普通螺母的失效形式；相对于振动频率，振动幅值和预紧力对螺栓失效的影响较大。 |
| 关键词: 横向振动 失效形式 防松螺母 试验研究 |
| DOI： |
|
| 基金项目:国家基础研究发展计划（613277）；国家自然科学基金（11272074） |
|
| Study on Failure of Bolt Connection and Influence Factors Under Transverse Vibration |
| LI Zhibin,CHEN Yan,SUN Weicheng,GAO Qiang,GUAN Zhenqun |
| (Department of Engineering Mechanics, Dalian University of Technology;State Key Laboratory of Structural Analysis for Industrial Equipment) |
| Abstract: |
| In this paper, the failure problems of bolted connection structure under transverse vibration are studied. Firstly, the failure processes between the plain nuts and anti-loose nuts are compared in the same condition. The results show that the plain nuts only appear loosening failure, while the anti-loose nuts fail completely because of the fatigue fracture at the root of the bolt after partial loosening. Among different types of anti-loosening nuts, the anti-loosening effect of Hard-lock nut and Spiralock nut is obviously better than the others. Secondly, the effects of disassembly times, vibration amplitude, initial pretension force and vibration frequency on the failure of bolt connection are studied. It is found that the disassembly times may change the failure mode. Comparing the vibration frequency, the vibration amplitude and the initial preload have a greater influence on bolt failure. |
| Key words: Transverse vibration Failure mode Anti-loose nut Experimental investigations |