振动工况下的螺栓连接自松弛机理研究

王崴;徐浩;马跃;刘海平

振动与冲击 ›› 2014, Vol. 33 ›› Issue (22) : 198-202.

PDF(1776 KB)
PDF(1776 KB)
振动与冲击 ›› 2014, Vol. 33 ›› Issue (22) : 198-202.
论文

振动工况下的螺栓连接自松弛机理研究

  • 王崴,徐浩,马跃,刘海平
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Study on Self-Loosening Mechanism of Bolted Joints under Vibration

  • Wang Wei, Xu Hao, Ma Yue, Liu Haiping
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摘要

为了研究振动工况下的螺栓连接自松弛机理,利用ANSYS参数化语言建立了考虑螺纹的三维螺栓连接有限元模型,使用降温法加载预紧力,进行了螺栓连接横向振动瞬态分析,研究了横向激励幅值,初始预紧力,螺纹啮合面、螺栓头和螺母承压面以及连接物之间结合面的摩擦系数等对螺栓连接自松弛的影响。结果表明:在横向振动条件下,完全滑移首先发生在螺纹啮合面处;横向激励幅值越小、初始预紧力越大、螺纹啮合面及螺栓头和螺母承压面摩擦系数越大,螺栓连接自松弛越不容易发生;在激励幅值一定的条件下,连接物之间结合面的摩擦系数对自松弛没有影响,但摩擦系数越大,发生横向振动所需的剪切载荷也越大。这些研究结果对理解螺栓连接自松弛和指导防松设计具有非常重要的意义。

Abstract

Aiming at analyzing the self-loosening mechanism of bolted joints under vibration, a three dimensional FEA model of bolted joints , which had taken thread into consideration, was built with the application of APDL, and the preload was applied on the bolted joints by dropping temperature, then FEA transient analysis of the bolted joints under transverse cyclic excitation was conducted. Effect of transverse cyclic excitation’s amplitude, initial preload, thread and bearing friction coefficients, the joints’ surface friction coefficient on self-loosening was investigated. The results show that the complete thread slip occurs prior to the complete bearing surface slip under transverse vibration; the smaller amplitude is, and the greater initial preload, thread and bearing friction coefficients are, the more difficult self-loosening is to happen; the joints’ surface friction coefficient has little relationship with self-loosening, however, the larger joints’ surface friction coefficient makes the needed shearing force, which induces the transversal vibration, larger. These are of great significance for understanding of fasteners’ self-loosening and designing of bolted joints’ anti-loosening.

 

关键词

螺栓连接 / 振动 / 瞬态分析 / 预紧力 / 摩擦系数

Key words

Bolted joints / Vibration / Transient Analysis / Preload / Friction Coefficient

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导出引用
王崴;徐浩;马跃;刘海平. 振动工况下的螺栓连接自松弛机理研究[J]. 振动与冲击, 2014, 33(22): 198-202
Wang Wei;Xu Hao;Ma Yue;Liu Haiping. Study on Self-Loosening Mechanism of Bolted Joints under Vibration[J]. Journal of Vibration and Shock, 2014, 33(22): 198-202

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