| Citation: | WANG Kaiping, YAN Ming, SU Donghai, et al. Bolt loosening characteristics based on change of slip-adhesion contact state under shear load[J]. Journal of Aerospace Power, 2023, 38（2）：453-461 doi: 10.13224/j.cnki.jasp.20210127
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In order to study the bolt looseness characteristics, a fine finite element model of bolt connection structure with raised angle was established, and the initial preload was applied by means of applying torque method. Then, simulation analysis of bolt looseness characteristics was carried out, Finally, the accuracy of this method was verified. The results showed that: the change law of slip adhesion contact state of bolt head contact surface and thread contact surface can accurately characterize the bolt loosening characteristics; the alternate change of slip adhesion contact state of two contact surfaces is the main factor causing bolt loosening; if there is always an adhesion area, no bolt loosening occurs; the larger area of contact surface in the sliding state indicated the faster growth rate, the faster bolt loosening and higher likeliness of loosening; the larger amplitude and the greater eccentricity distance indicated the larger area and the faster speed of two contact surfaces entering the sliding state, and the easier bolt loosening; the greater difference of friction coefficient between the two contact surfaces indicated the higher likeliness of bolt loosening.
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