Analysis of loosening characteristics of bolted joint subjected to combined transverse and axial loads

DOI:	10.11809/bqzbgcxb2023.10.043
Keywords:	bolted joint; bolt loosening; combined load; finite element method
Abstract:	Bolted joints are usually subjected to combined transverse and axial cyclic loads. The loosening behavior of bolted joint is more complicated than that of transverse or axial unidirectional cyclic loading. Based on the finite element method, a three dimensional numerical model of bolted joint considering screw rotation characteristics is established. The loosening behavior of bolted joint under the influence of different transverse and axial excitation load amplitudes, assembly preload, friction coefficient of contact surface and other factors is calculated and analyzed. A mathematical model of bolt loosening rate relative to transverse and axial load amplitudes is obtained, which can be used to predict the critical load of bolt loosening. The results show that the increase of axial excitation load amplitude will accelerate bolt loosening while the amplitude of transverse excitation load is less than a certain value. However, the increase of axial excitation load amplitude will inhibit bolt loosening when the amplitude of transverse excitation load is greater than a certain value. In addition, the greater the preload and interface friction coefficient, the smaller the amplitude of transverse load, and the more difficult it is for the bolt to loosen. Compared with single axial load, the bolt loosening rate under combined load is more sensitive to load amplitude, preload and friction coefficient. The research deepens the understanding of bolt loosening behavior under combined transverse and axial loads.
Issue:	Vol. 44 No. 10 (2023)
Published:	2023-10-28
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