线程(计算)
滑脱
结构工程
螺栓连接
横截面
扭矩
振动
弯矩
剪切力
摩擦力矩
工程类
刚度
激发
机械
材料科学
有限元法
机械工程
物理
声学
电气工程
热力学
作者
Sayed A. Nassar,Xianjie Yang
出处
期刊:Journal of Vibration and Acoustics
日期:2009-02-18
卷期号:131 (2)
被引量:38
摘要
A mathematical model is proposed for studying the vibration induced loosening of threaded fasteners that are subjected to harmonic transverse excitation, which often causes slippage between the contact surfaces between engaged threads and under the bolt head. Integral equations are derived for the cyclic shear forces as well as the bearing and thread friction torque components. They depend on the ratio of the relative rotational to translational velocities. The relationship between the dynamic thread shear force and bending moment is developed. When the external transverse excitation is large enough, it causes the threaded fasteners to loosen. Numerical results show that the dynamic transverse shear forces on the underhead contact surface, and between the engaged threads, decrease the bearing, and thread friction torque components. The effect of bolt preload, bearing and thread friction coefficients, the amplitude of the harmonic transverse excitation, and the bolt underhead bending on the bolt loosening are investigated. Experimental verification of the analytical model results of the bolt twisting torque is provided.
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