Vdi 2230 part 2 pdf
The external loads break the original force balance at the SJS, and the preload reduction at the SJS is caused by plastic deformation and slipping.
The loss of preload, which is directly linked to loosening, is affected by external loads and structural parameters. Screwed-joint structures (SJSs) typically undergo loosening failure during service, which may lead to product failure or major accidents. Screwed-joint performances (SJPs) are important for obtaining the overall structural characteristics and estimating the probability of the main cause for structural damage and failure. Screwed joints (SJs) are widely used in various mechanical structures owing to their advantages of having a simple structure, easy assembly or disassembly and adjustment, and so on.
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. The results of this study are expected to provide significant guidance to engineering practices. 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 confirmed that structural safety is ensured and that accident risk is reduced. A new experimental scheme for measuring the critical residual preload was employed to verify the reliability and accuracy of the numerical calculation 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. The applicability of existing models is expanded by this new model. 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. 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.