Research on the Numerical Calculation Method for Antiloosening Performance of Screwed Joints under Complex Working Conditions

Abstract

This study aimed at addressing the difficulties entailed in accurately determining the working loads of screwed joints (SJs) by establishing mechanical models and verifying the accuracy of the numerical calculation model of antiloosening performance under complex working conditions. First, considering the slip state of the interface and the stress state of the thread surface, a corresponding mechanical model was established to investigate the quantitative model of the interaction amongst structural parameters, complex working loads, and antiloosening performance of SJs. The applicability of existing models is expanded by this new model. Second, a load calibration test, an actual working condition test, and a dynamic simulation were combined to accurately determine the load under complex working conditions. A new experimental scheme for measuring the critical residual preload was employed to verify the reliability and accuracy of the numerical calculation model. The results confirmed that structural safety is ensured and that accident risk is reduced. Finally, based on this model, the transverse load, axial load, bending moment, torque about the bolt axis, clamping eccentricity, loading eccentricity, and coefficient of friction in the thread and at the interface were analyzed in terms of the antiloosening performance. The results of this study are expected to provide significant guidance to engineering practices. Moreover, the numerical calculation model can accurately predict the antiloosening performance and failure and also provide technical support for improving the structural reliability, particularly for key screwed-joint structures (SJSs), under complex working conditions loading.

Self-Loosening Failure Analysis Considering Vibration Frequency: Experimental Study for the Spare Tire Carrier

“…Moreover, another study also suggested the suppression or hindrance of loosening through preload and increased friction coefficients and reducing the clamping field's length and tight tolerance [10]. Mo also emphasized the parameters influencing the relaxation, such as the effect of transverse and axial load, bending moment, and friction coefficient on anti-loosening performance [21]. Furthermore, previous research conducted using another STC model has shown that looseness was initiated by vibration [22][23][24].…”

“…The process involved preparing a jig with sturdy construction and resistance to vibration, followed by the use of a strain gauge for data acquisition. The strain gauge was used to directly monitor the changes in strain and tension when appropriately placed, after which the data obtained were processed and analyzed [21,22,[24][25][26][27][28][29][30][31].…”

Experimental and numerical simulation study on coupling tripping of partial trapezoidal threaded casing head and casing coupling

“…Through theoretical research and experimental verification (Nassar and Xianjie, 2007;Nassar and Yang, 2008), obtained equations that can predict the torque and clamping force between threads and bearings and calculation equations between thread friction, pitch, and torque components. Mo et al (2020) proposed a numerical calculation model for thread anti-loosening and verified its reliability through experiments. The research results show that the load has a more significant impact on the anti-loosening performance.…”