| Citation: | ZHANG Gongping, LIU Wenguang, HUANG Zheng, et al. Effect of bolthead/nut constraint state on thread loosening characteristics[J]. Journal of Aerospace Power, 2025, 40（5）：20230675 doi: 10.13224/j.cnki.jasp.20230675
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In order to investigate the effects of the constraint state of bolthead/nut on the thread loosening characteristics, two kinds of anti-loosening structures with bolthead constraint or nut constraint were proposed. The fine finite element model of a single-lapped and single bolted joint structure was developed, and the thread loosening process of different kinds of anti-loosening models under transverse vibration was simulated. Thereafter, the thread loosening characteristics of different models under different loading, friction factors of the threaded surfaces, and friction factors of the bearing surfaces were analyzed. A thread loosening test was carried out to verify the anti-loosening effect in the end. Results indicated that under the same conditions, for the ordinary bolted joint without constrained bolthead and nut, the preload loss was the largest in the pre-vibration period, and the easiest to occur loosening. For the new type of bolted joint with constrained bolt head, the preload recession was the slowest, the loss was the smallest, and it had excellent anti-loosening effect. For the bolted joint with constrained nut, the loosening was the fastest, and no anti-loosening effect was achieved. In the project application, the bolted joint of constraining the bolthead can be considered in design to improve the anti-loosening capability.
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