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| Study on Influencing Factors of Interconnected Structures Fatigue Performance of Wing Box and Its Finite Element Analysis |
| GAO Pengfei1,2, LIU Defeng3, CAI Junjie1,2, WANG Xiaoyang4, ZHANG Yanjun4, LIU Mabao1,2 |
1. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China;
2. School of Aerospace, Xi’an Jiaotong University, Xi’an 710049, China;
3. AVIC Beijing Changcheng Aeronautical Measurement and Control Technology Research Institute, Beijing 101111, China;
4. AVIC The First Aircraft Institute, Xi’an 710072, China |
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Abstract Fatigue tests of the specimen designed according to the typical interconnected structures of a certain airplane’s wing box were carried out to analyze the effects of different assembly processes of high locked bolts on fatigue performance. The results show that the fatigue performance of interconnected structures can be improved effectively by exerting an appropriate second–tightening torque to high locked bolts after the current assembling processes. A three–dimensional finite element model was established to investigate the effects of tightening torque of bolts, friction coefficient between plates as well as elastic modules of bolts on the stress concentration factor of the hole edge in basic plates. The study indicates that all the three factors have great influence on the stress concentration factor of the hole edge. Furthermore, tightening torque of bolts has the most significant impact. It also shows that exerting a second–tightening torque is an effective mean to improve the fatigue performance of interconnected structures.
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. COVER[J]. Aeronautical Manufacturing Technology, 2022, 65(3): 1-1. |
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2019, 
