| 横向振动作用下螺纹联接松动过程的实验研究 |
| 李海江, 田煜, 孟永钢, 陈凯凯 |
| 清华大学 摩擦学国家重点实验室, 北京 100084 |
| Experimental study of the loosening of threaded fasteners with transverse vibration |
| LI Haijiang, TIAN Yu, MENG Yonggang, CHEN Kaikai |
| State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China |
摘要:
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| 摘要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。 | ||||||
| 关键词 ：螺纹联接,松动过程,横向振动,夹紧力 | ||||||
| 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. | ||||||
| Key words：threaded fastenerloosening processtransverse vibrationclamping force | ||||||
| 收稿日期: 2015-06-26 出版日期: 2016-02-17 | ||||||
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| 基金资助:国家自然科学基金项目(51425502) | ||||||
| 通讯作者:田煜, 研究员, E-mail: tianyu@mail.tsinghua.edu.cnE-mail: tianyu@mail.tsinghua.edu.cn | ||||||
| 作者简介: 李海江(1983—), 男(汉), 湖南, 博士后。 | ||||||
| 引用本文: |
| 李海江, 田煜, 孟永钢, 陈凯凯. 横向振动作用下螺纹联接松动过程的实验研究[J]. 清华大学学报（自然科学版）, 2016, 56(2): 171-175,184. LI Haijiang, TIAN Yu, MENG Yonggang, CHEN Kaikai. Experimental study of the loosening of threaded fasteners with transverse vibration. Journal of Tsinghua University(Science and Technology), 2016, 56(2): 171-175,184. |
| 链接本文: |
| http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2016.22.006或 http://jst.tsinghuajournals.com/CN/Y2016/V56/I2/171 |
图表:
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| 图1 螺纹联接横向振动实验示意图 |
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| 图2横向振动作用下螺纹联接的夹紧力(F) 随振动次数(N)的衰减 |
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| 图3 振幅(A)对松动曲线的影响 (预紧力50kN,干摩擦) |
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| 表1 振幅对模型函数各参数的影响 |
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| 图4 预紧力(F0)对松动曲线的影响 (振幅0.4mm,干摩擦) |
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| 表2 预紧力对模型函数各参数的影响 |
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| 图5 不同振动周期内夹紧力与振动角横向位移(φ) 的关系(预紧力15kN,振幅1.6mm) |
参考文献:
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