复合材料单螺栓连接结构的预紧力

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中图分类号：TH131.3；TB115.1 文献标志码：B

Preload of composite connection structure of single bolt

HU Peng ， JIANG Bingyun1'3，BAO Yidong2，LIU Junlei1，YUAN Pengfei （1.Wanbang Digital EnergyCo.，Ltd.，Changzhou 213O00，Jiangsu，China；2.Schoolof MechanicalandElectronic Enginering，Nanjing Universityof Aeronautics and Astronautics，Nanjing 210o16，China；3.School of Mechanical Engineering，Zhejiang University，Hangzhou 310O27，China）

Abstract： To accurately obtain the preload required for the single bolt connection structure，the effect of process parameters on the tightening torque-preload relationship is studied. Based on the geometric expression of thread contour，the parametric model of single composite bolt connection structure is built using Python language. The accuracy of the model is verified，and the finite element method is used to analyze the effects of parameters on the tightening torque-preload relationship，that includes the friction coefficient，the nominal bolt diameter，and the bolt pitch.The results show thatthe efectof bolt pitch on the tightening torque-preload relationship is litle. When the torque is constant，the smaller the nominal bolt diameter，the greater the bolt preload，but the maximum design preload that could be achieved is also reduced accordingly. The friction coeficient has the most significant influence on the tightening torque-preload relationship.

Key words： composite；bolt connection；parametric modeling； process parameter； preload；tightening torque

0引言

螺栓连接是复合材料常用的一种连接方式，构件通过螺栓预紧力连接，预紧力的大小对连接的可靠性有重要影响，因此控制螺栓连接的预紧力对复合材料的结构连接具有重要作用[2

螺栓预紧力受多种因素影响。（剩余6157字）