预紧力对复合材料螺栓接头拉伸力学性能的影响  

Influence of Preload Force on Tensile Mechanical Properties of Composite Bolted Joints

作　　者：岳烜德 谢颖 刘蕾 李鼎 王浩 武艳君 黄茹雪 YUE Xuande;XIE Ying;LIU Lei;LI Ding;WANG Hao;WU Yanjun;HUANG Ruxue(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》2024年第5期22-26,共5页Machine Building & Automation

摘　　要：建立复合材料单螺栓单搭接头实验模型,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。实验研究中设置11组不同大小的预紧力,得到预紧力大小对接头拉伸刚度和峰值载荷的影响规律。使用3D-DIC全场应变测量系统得到接头表面应变场,分析反映装配应力水平对接头力学性能的影响规律。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,此时峰值载荷为16.66 kN,拉伸刚度为19.12 kN/mm。A model of composite single-bolt single-lap joint was established to study the influence of preload and assembly stress on its tensile mechanical properties.Eleven sets of different sizes of preload levels were set up in the experimental study,and the behaviour of preload size on the tensile stiffness and peak load of the composite joints were obtained.The strain fields on the joint surface were obtained using a 3D-DIC full-ield strain measurement system,and the influence of the damage factor reflecting the assembly stress level on the mechanical properties of the joint was analyzed.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.The best mechanical properties are obtained at a preload of around 12 kN,when the peak load is 16.66 kN and the tensile stiffness 19.12 kN/mm.

关 键 词：复合材料 螺栓 接头 力学性能 实验 

分 类 号：TB33[一般工业技术—材料科学与工程]