横向振动作用下螺纹联接的松动是一个复杂的多阶段过程。该研究改造了Junker横向振动试验机, 研究了横向振动作用下螺纹联接夹紧力的衰减过程, 并对单个振动周期内夹紧力与横向振动位移之间的同步变化进行了实验测量。通过对夹紧力衰减曲线的数值拟合发现, 在松动初期夹紧力与横向振动次数之间满足双指数函数关系。该双指数函数反映了松动初期螺纹联接摩擦界面的应变松弛与接触状况的动态变化。该研究得到了该双指数函数的各个参数与横向振动的振幅以及初始预紧力之间的关系, 提出的夹紧力衰减函数为螺纹联接松动过程的定量预测提供了参考。
Abstract
The loosening of threaded fasteners experiencing transverse vibrations is a complicated multi-stage process. This study uses a Junker transverse vibration tester to study the loosening of threaded fasteners with transverse vibrations. Also, the clamping force is correlated with the transverse displacement for single transverse vibration cycles. Correlations of the clamping force show that during the early stage of the loosening process, the clamping force correlates well with the number of transverse vibration cycles when using a double-exponential equation. This equation reflects the strain relaxation and dynamic changes in the contact conditions at the friction interface of the threaded fasteners. The parameters of the double-exponential equation are related to the amplitude of the transverse vibration and the initial pre-tightening force. This function for the decaying clamping force provides an approach for quantitative predictions of the loosening of threaded fasteners.
关键词
螺纹联接 /
松动过程 /
横向振动 /
夹紧力
Key words
threaded fastener /
loosening process /
transverse vibration /
clamping force
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参考文献
[1] Hess D P. Handbook of Bolts and Bolted Joints [M]. Boca Raton, FL: The Chemical Rubber Company Press, 1998: 757-824.
[2] Junker G H. New criteria for self-loosening of fasteners under vibration [J]. Transactions of the Society of Automotive Engineers, 1969, 78: 314-335.
[3] 山本晃. 螺纹联接的理论与计算 [M]. 郭可谦, 译. 上海: 上海科学技术文献出版社, 1984.Yamamoto P. Theory and Calculation of Threaded Fasteners [M]. GUO Keqian, Trans. Shanghai: Shanghai Science and Technology Literature Press, 1984. (in Chinese)
[4] Izumi S, Yokoyama T, Iwasaki A, et al. Three-dimensional finite element analysis of tightening and loosening mechanism of threaded fastener [J]. Engineering Failure Analysis, 2005, 12(4): 604-615.
[5] Pai N G, Hess D P. Three-dimensional finite element analysis of threaded fastener loosening due to dynamic shear load [J]. Engineering Failure Analysis, 2002, 9(4): 383-402.
[6] Pai N G, Hess D P. Experimental study of loosening of threaded fasteners due to dynamic shear loads [J]. Journal of Sound and Vibration, 2002, 253(3): 585-602.
[7] Yamamoto A, Kasei S. A solution for self-loosening mechanism of threaded fasteners under transverse vibration [J]. Bull Jpn Soc Precis Eng, 1984, 18(3): 261-266.
[8] Sakai T. Investigations of bolt loosening mechanisms: 1st report, on the bolts of transversely loaded joints [J]. Bulletin of JSME, 1978, 21(159): 1385-1390.
[9] Fujioka Y, Sakai T. Rotating loosening mechanism of a nut connecting a rotary disk under rotating-bending force [J]. Journal of Mechanical Design, 2005, 127(6): 1191-1197.
[10] Shoji Y, Sawa T. Analytical research on mechanism of bolt loosening due to lateral loads [C]//Proceedings of PVP, American Society of Mechanical Engineers. Denver, CO, 2005.
[11] Jiang Y, Zhang M, Lee C. A study of early stage self-loosening of bolted joints [J]. Journal of Mechanical Design, 2003, 125(3): 518-526.
[12] Zhang M, Jiang Y, Lee C. Finite element modeling of self-loosening of bolted joints [J]. Journal of Mechanical Design, 2006, 129(2): 218-226.
[13] Haviland G S. Designing with Threaded Fasteners [R]. Hartford, CT: Loctite Corporation, 1983.
[14] Hassan T, Kyriakides S. Ratcheting in cyclic plasticity, part I: Uniaxial behavior [J]. International Journal of Plasticity, 1992, 8(1): 91-116.
[15] 贾凤兰. CA6102发动机连杆螺栓松动的试验研究 [J]. 内燃机工程, 1991, 12(1): 4-10.JIA Fenglan. An experimental investigation on self-loosening of con-rod bolts for CA6102 engine [J]. Internal Combustion Engine Engineering, 1991, 12(1): 4-10. (in Chinese)
[16] Nassar S A, Housari B A. Study of the effect of hole clearance and thread fit on the self-loosening of threaded fasteners [J]. Journal of Mechanical Design, 2006, 129(6): 586-594.
[17] Housari B A, Nassar S A. Effect of thread and bearing friction coefficients on the vibration-induced loosening of threaded fasteners [J]. Journal of Vibration and Acoustics, Transactions of the ASME, 2007, 129(4): 484-494.
[18] 施刚, 石永久, 王元清, 等. 钢结构端板连接高强度螺栓应变松弛的实验研究 [J]. 施工技术, 2003, 32(11): 15-17.SHI Gang, SHI Yongjiu, WANG Yuanqing, et al. Experimental research on strain relaxation of high strength bolts in end-plate connections [J]. Construction Technology, 2003, 32(11): 15-17. (in Chinese)
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