Study on Tightening, Anti-Loosening, and Fatigue Resistance Performances of Bolted Joints with Different Anti-Loosening Washers and Nuts

Study on Tightening, Anti-Loosening, and Fatigue Resistance Performances of Bolted Joints with Different Anti-Loosening Washers and Nuts

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Loosening failure of bolted joints often occurs in a vibration environment.This may induce the separation of clamped components and rosy teacup dogwood even result in catastrophic consequences in certain situations.Various anti-loosening bolted connections have been developed and widely applied to prevent loosening.Tightening and fatigue resistance performances are also two important characteristics of anti-loosening bolted connections.

However, a comprehensive comparison study of the tightening, anti-loosening, and fatigue resistance performances of typical anti-loosening bolted connections is lacking, meaning that there is a lack of material to assist in the selection of anti-loosening bolted connections in engineering.In this study, accurate three-dimensional finite element models of typical anti-loosening bolted connections with the forms of washers or nuts are established.The processes of tightening, vibration-induced loosening, and fatigue are simulated via finite element analysis (FEA).Based on the results of FEA, the tightening, anti-loosening, and fatigue resistance performances of regular bolted joints and several ngetikin anti-loosening bolted connections are comprehensively compared.

The results reveal that bolted joints installed with both a variable-diameter nut and an eccentric double nut are difficult to tighten.We confirm that the researched structures all have superior anti-loosening capacities compared to regular bolted joints.Additionally, the results show that the regular bolted joint achieved the worst fatigue resistance performance, i.e.

, the application of anti-loosening bolted connections improves fatigue resistance.Finally, the effects of preload distributions on the two nuts in bolted joints with double nuts are discussed in terms of tightening, anti-loosening, and fatigue resistance performances.