Experimental study of the loosening of threaded fasteners with transverse vibration

LI Haijiang; TIAN Yu; MENG Yonggang; CHEN Kaikai

doi:10.16511/j.cnki.qhdxxb.2016.22.006

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Journal of Tsinghua University(Science and Technology) ›› 2016, Vol. 56 ›› Issue (2) : 171-175,184. DOI: 10.16511/j.cnki.qhdxxb.2016.22.006

MECHANICAL ENGINEERING

Experimental study of the loosening of threaded fasteners with transverse vibration

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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 fastener / loosening process / transverse vibration / clamping force

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LI Haijiang, TIAN Yu, MENG Yonggang, CHEN Kaikai. Experimental study of the loosening of threaded fasteners with transverse vibration[J]. Journal of Tsinghua University(Science and Technology). 2016, 56(2): 171-175,184 https://doi.org/10.16511/j.cnki.qhdxxb.2016.22.006

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