螺栓连接防松胶扭拉关系、黏接性能与振动试验研究

To meet the high reliability service requirements of aerospace products，various thread locking adhesives are widely used in engineering. However，there is a lack of systematic research on the curing adhesion strength and anti-loosening performance of thread locking adhesives currently，as well as the influence of applying thread locking adhesives on the torsion-tension relationship of bolted joints. Five typical thread locking adhesives of two categories were selected for research in this study，being applied to connection structures of M8 alloy steel bolts and nuts，and M5 titanium alloy bolts with stainless-steel nuts. Specialized experimental fixtures were developed， and the experimental content was meticulously designed using the controlled variable approach. The torsion-tension relationship of the bolts and nuts with thread locking adhesives applied， the torque required for disassembly after curing， and the disassembly torque after 30 000 times of severe lateral vibration were tested using a torsion-tension experimental machine and a vibration experimental machine， respectively. The influence of different thread locking adhesives on the torque coefficient， adhesive strength， and anti-loosening performance were explored. Finally，the influence of process factors such as surface cleanliness，adhesive application amount，and the positioning of the bolts and nuts were systematically discussed. The findings of this paper provide support for the setting of tightening torque for adhesive-applied bolts， the selection of thread locking adhesives，and the optimization of thread locking adhesive processes.