Based on a new bolt loosening test rig, the loosening tests of bolted joints subjected to eccentric excitation are carried out under various experimental parameters. According to the evolution curves of the axial force of the bolt, the self-loosening behavior of bolted joints under eccentric excitation is investigated. After the tests, the damage of threads is analyzed using OM (optical microscope), SEM (scanning electron microscope) and EDX (energy dispersive X-ray). The influences of fretting behavior (micro-slip and fretting wear) between the contact threads on self-loosening of bolted joints are discussed in depth, and the self-loosening mechanism of bolted joints is revealed in details. The results show that the axial force of the bolt decreased obviously, while the breakaway torque has no obvious change. The self-loosening process of a bolted joint can be divided into two stages:Firstly, the axial force of the bolt drops rapidly due to the removal of asperities on the contact surfaces and the plastic deformation. Secondly, because of the ratcheting of material, plastic deformation increases slowly, and fretting wear between contact surfaces is the main reason of the decrease of the axial force of the bolt. The main wear mechanisms of the contact surfaces between threads were delamination, abrasive wear and adhesive wear. In addition, numerical simulation was performed using ABAQUS, and the FE results are agreement with the experimental observations.
DU Yongqiang
,
LIU Jianhua
,
LIU Xuetong
,
CAI Zhenbing
,
PENG Jinfang
,
ZHU Minhao
. Research on Self-Loosening Behavior of Bolted Joints under Eccentric Excitation[J]. Journal of Mechanical Engineering, 2018
, 54(14)
: 74
-81
.
DOI: 10.3901/JME.2018.14.074
[1] 侯世远,廖日东. 螺纹联接松动过程的研究现状与发展趋势[J]. 强度与环境,2014,41(2):39-52. HOU Shiyuan,LIAO Ridong. Resaerch progress on self-loosening of threaded fasteners[J]. Structure & Environment Engineering,2014,41(2):39-52.
[2] 张朝辉,由小川,吕海波,等. 火箭级间段连接螺栓失效数值模拟[J]. 强度与环境,2007,34(4):49-57. ZHANG Chaohui,YOU Xiaochuan,LÜ Haibo,et al. Numerical simulation of bolt failure in rocket inter -stage connection[J]. Structure & Environment Engineering,2007,34(4):49-57.
[3] GAMBRELL S C. Why bolts loosen[J]. Machine Design,1968,40:163-167.
[4] NASSAR S A,MATIN P H. Clamp load loss due to fastener elongation beyond its elastic limit[J]. Journal of Pressure Vessel Technology,2006,128(3):379-387.
[5] NASSAR S A,MATIN P H. Cumulative clamp load due to a fully reversed cyclic service load acting on an initially yielded bolted joint system[J]. Journal of Mechanical Design,2007,129(4):421-433.
[6] BASAVA S,HESS D P. Bolted joint clamping force variation due to axial vibration[J]. Journal of Sound and Vibration,1998,210(2):255-265.
[7] 解会,王峰会,张凯,等. 振动状态下螺栓松动行为及原因分析[J]. 现代机械,2017(3):44-47. XIE Hui,WANG Fenghui,ZHANG Kai,et al. Bolt looseness and the causes analysis in the vibration[J]. Modern Machinery,2017(3):44-47.
[8] JUNKER G H. New criteria for self-loosening faster under vibration[J]. SAE Transactions,1969,78:314-335.
[9] 何竞飞,汤涛,汪成生. 交变横向载荷下螺栓联接自松弛有限元研究[J]. 现代制造工程,2016(3):1-6. HE Jingfei,TANG Tao,WANG Chengsheng. Finite element research on self-loosening problem of bolt connection under the alternating lateral load[J]. Modern Manufacturing Engineering,2016(3):1-6.
[10] 何竞飞,汪成生,汤涛. 轴向偏心交变载荷作用下螺纹副滑移研究[J]. 机械科学与技术,2015,34(8):498-503. HE Jingfei,WANG Chengsheng,TANG Tao. Study on slip of the screw thread subjected to axial eccentric alternate load[J]. Mechanical Science and Technology for Aerospace Engineering 2015,34(8):498-503.
[11] 酒井智次. 螺纹紧固件联接工程[M]. 北京:机械工业出版社,2016. SAKAI C. Thread fastener connection engineering[M]. Beijing:China Machine Press,2016.
[12] ZHANG M,JIANG Y,LEE C H. Finite element modeling of self-loosening of bolted joints[J]. Journal of Mechanical Design,2007,129(2):218.
[13] 陈海平,曾攀,方刚,等. 螺纹副承载的分布规律[J]. 机械工程学报,2010,46(9):171-178. CHEN Haiping,ZENG Pan,FANG Gang,et al. Load distribution of bolted joint[J]. Journal of Mechanical Engineering,2010,46(9):171-178.
[14] YOKOYAMA T,OLSSON M,IZUMI S,et al. Investigation into the self-loosening behavior of bolted joint subjected to rotational loading[J]. Engineering Failure Analysis,2012,23:35-43.
[15] 李玲,蔡安江,蔡力钢,等. 螺栓结合面微观接触模型[J]. 机械工程学报,2016,52(7):205-212. LI Ling,CAI Anjiang,CAI Ligang,et al. Micro-contact model of bolted-joint interface[J]. Journal of Mechanical Engineering,2016,52(7):205-212.
[16] 刘绍鹏,王涛,李友荣,等. 螺栓联接界面表面分形及接触研究[J]. 机械设计与制造,2016(5):107-110. LIU Shaopeng,WANG Tao,LI Yourong,et al. Study on fractal behavior and contact of bolt connected surfaces[J]. Machinery Design & Manufacture,2016(5):107-110.
[17] IBRAHIM R A,PETTIT C L. Uncertainties and dynamic problems of bolted joints and other fasteners[J]. Journal of Sound and Vibration,2005,279(3-5):857-936.
[18] 周仲荣,朱旻昊. 复合微动磨损[M]. 上海:上海交通大学出版社,2004. ZHOU Zhongrong,ZHU Minhao. Dual-fretting wear[M]. Shanghai:Shanghai Jiao Tong University Press,2004.
[19] 管聪荣. 螺纹联接失效原因的分析[J]. 煤矿机械,2000(11):28-30. GUAN Congrong. Analysing the failure causes of the screw-thread connection[J]. Coal Mine Machinery,2000(11):28-30.
[20] LIU Jianhua,OUYANG Huajiang,PENG Jinfang,et al. Experimental and numerical studies of bolted joints subjected to axial excitation[J]. Wear,2016,346-347:66-77.
[21] LIU Jianhua,OUYANG Huajiang,FENG Zhiqiang,et al. Study on self-loosening of bolted joints excited by dynamic axial load[J]. Tribology International,2017,115:432-451.
[22] 美制和英制螺纹标准手册编委会公制. 公制、美制和英制螺纹标准手册[M]. 北京:中国标准出版社,2004. National Technical Committee on Thread of Standardization Administration of China. Standard manual of screw in metric,american and english system[M]. Beijing:China Standard Press,2004.
