预紧力对复合材料螺栓接头拉伸力学性能影响的仿真研究  

Simulation Study on Effect of Preload on Tensile Mechanical Properties of Composite Bolted Joints

作　　者：岳烜德 韩子默 张洪浩 YUE Xuande;HAN Zimo;ZHANG Honghao(AVIC Chengdu Aircraft Industry Group Co.,Ltd.,Chengdu 610091,China)

机构地区：[1]成都飞机工业有限责任公司,四川成都610091

出　　处：《机械制造与自动化》2025年第1期175-179,共5页Machine Building & Automation

摘　　要：复合材料螺栓连接结构中,预紧力是满足结构力学性能的关键参数。建立复合材料单螺栓单搭接头有限元模型,对预紧力及装配应力对其拉伸力学性能的影响规律进行研究。设置11组不同大小的预紧力水平,得到预紧力对接头拉伸刚度、峰值载荷及复合材料渐进损伤的影响规律。结果表明:对于直径6.35 mm的螺栓,随着螺栓预紧力的增加,复合材料螺栓接头的拉伸刚度与峰值载荷先增加后减小,预紧力为12 kN左右时接头获得最佳力学性能。复合材料层压板的初始损伤载荷随预紧力的增加先缓慢增大后迅速减小,预紧力为10 kN时基体初始损伤载荷最大;预紧力为12 kN时,纤维初始损伤载荷最大。As preload is the key parameter to meet the mechanical properties of the structure in composite bolted structures,a finite element model of composite single-bolt single-lap joint is established for investigating the influence of the preload and assembly stress on its tensile mechanical properties.Eleven sets of different sizes of preload levels are set,and the influence law of preload on the tensile stiffness,peak load and progressive damage of the composite material are obtained.The results show that the tensile stiffness and peak load of the composite bolt joint increases first and then decreases with the increase of the preload force for 6.35 mm diameter bolts,and the best mechanical properties are obtained when the preload force is about 12 kN,The initial damage load of the composite laminate increases slowly and then decreases rapidly with the increase of preload,in which the initial damage load reaches the maximum when preload is 10 kN and the initial damage load of the fiber attains the maximum as preload is 12 kN.

关 键 词：复合材料 螺栓 预紧力 力学性能 损伤 

分 类 号：V229[航空宇航科学与技术—飞行器设计]