Influence of bolt dynamic installation on topography characteristics and mechanical behaviors of CFRP interference-fit bolted joints  

作　　者：Xiaohe WANG Zengqiang CAO Yuehaoxuan WANG Yingjiang GUO 

机构地区：[1]School of Mechanical Engineering,Northwestern Polytechnical University,Xi’an 710072,China [2]NPU Xuhang Electromagnetic Technology Co.,Ltd.,Xi’an 710100,China

出　　处：《Chinese Journal of Aeronautics》2024年第2期482-500,共19页中国航空学报（英文版）

基　　金：co-supported by the National Commercial Aircraft Manufacturing Engineering Innovation Fund,China(No.COMAC-SFGS-2-22-1816);Shaanxi Province Key Research and Development Program Projects,China(No.2022GXLH-02025);Shaanxi Province 100 Scientific and Technological Achievements Transformation Action Projects,China(No.2021CGBX-11)。

摘　　要：As the controlled research of Dynamic Installation(DI)and Static Installation(SI),a new interference installation method was developed based on electromagnetic loading to enhance the mechanical properties of composite structures.Four different interference-fit sizes were considered,ranging from a net fit to 2.0%.The experiments were conducted to evaluate the installation resistance and the mechanical behavior of the joint under external loads.Meanwhile,an FFA model to model the stress distribution and damage behavior of the bolt-hole contact interface was established.The load-displacement curve and damage modes of experiments were used to verify the FEA results.The results show that the installation resistance during DI process was remarkably lower than that of SI process corresponding to all interference-fit sizes,and the stress amplitudes induced by interference were larger and widely distributed.The damage of the hole wall was positively correlated with interference fit size,but DI can significantly reduce the damage compared to SI.In performance tests,DI enhanced the static bearing capacity and extended longer fatigue life of the joints than SI.DI methods can be an effective way to achieve highly reliable interference joints in composite structures.

关 键 词：Carbon Fiber-Reinforced Polymer(CFRP) Bolted joints Interference-fit Electromagnetic installation Finite Element Analysis(FEA) Damage mechanics Bearing behavior 

分 类 号：V262[航空宇航科学与技术—航空宇航制造工程]