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在民用飞机结构中,龙骨梁与龙骨梁下纵梁之间一般通过拉杆或角片的方式进行连接,当龙骨梁变形时,龙骨梁下纵梁所受到的附加载荷大小与它们之间的连接方式密切相关,如果连接方式设计不当,龙骨梁下纵梁会出现较为严重的疲劳问题。通过疲劳试验及有限元分析论证了龙骨梁下纵梁疲劳破坏的原因,提出了该处连接需要弱化弯曲刚度的设计要点,可为龙骨梁下纵梁与龙骨梁之间的连接设计提供一定参考。
In the civil aircraft structure, the keel beam and the keel beam are generally connected by means of tie rods or horns, and when the keel beam is deformed, the additional load on the keel beam and the connection between them Closely related to the way, if the connection is not properly designed, the keel beam will appear more serious fatigue problems. Through the fatigue test and the finite element analysis, the reason of the fatigue failure of the keel beam is demonstrated. The design points of the flexural rigidity that the keel beam needs to be weakened are proposed, which may provide reference for the design of the connection between the keel beam and the keel beam .