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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference vol.2: Computer Technology; 20050717-21; Denver,CO(US) >SELF-LOOSENING OF THREADED FASTENERS DUE TO CYCLIC TRANSVERSE LOADS
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SELF-LOOSENING OF THREADED FASTENERS DUE TO CYCLIC TRANSVERSE LOADS

机译：循环横向载荷引起的螺纹紧固件的自松

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摘要

A mathematical model and an experimental procedure are presented for studying the self-loosening phenomenon of threaded fasteners that are subjected to cyclic transverse loads. The effect of thread and underhead friction coefficients, the hole clearance, and the frequency and the amplitude of the transverse excitation are investigated. The experimental set up is made of a single-bolt joint, which is subjected to a cyclic transverse displacement or force. For each variable, the drop in the fastener tension and the joint clamp load versus the number of cycles is recorded and analyzed. In the mathematical model, the linear and angular motion of the bolt head is formulated in terms of the system properties and the external cyclic transverse excitation. The mathematical model provides the bolt rotation in the loosening direction, which causes the partial or full loss of the clamp load. An iterative MATLAB code is developed and used for the calculation of tension drop-off in the fastener tension due the self-loosening. Mathematical and experimental results are compared for various levels of system and external loading variables.
机译：为了研究承受周期性横向载荷的螺纹紧固件的自松现象，提出了一个数学模型和一个实验程序。研究了螺纹和底端摩擦系数，孔间隙以及横向激励的频率和幅度的影响。实验装置由单螺栓接头组成，该接头承受周期性的横向位移或力。对于每个变量，记录并分析紧固件张力和接头夹紧载荷相对于循环次数的下降。在数学模型中，螺栓头的线性和角运动是根据系统属性和外部循环横向激励来制定的。数学模型提供了螺栓在松动方向上的旋转，这会导致部分或全部损失夹紧载荷。开发了迭代的MATLAB代码，并将其用于计算由于自松而导致的紧固件张力中的张力下降。比较了各种级别的系统和外部负载变量的数学和实验结果。

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