Equivalent analysis spectrum construction method for aircraft structure containing cracks
Received date: 2017-05-25
Revised date: 2017-07-17
Online published: 2017-07-17
雷晓欣 , 张彦军 , 纪露明 , 朱亮 . 疲劳开裂结构等效分析谱构造方法[J]. 航空学报, 2017 , 38(S1) : 721577 -721577 . DOI: 10.7527/S1000-6893.2017.721577
To solve the problem that the load spectrum data of the aircraft structure containing cracks are not complete or too complex, a load spectrum compiling method for the aircraft structure containing cracks is proposed,which is based on Detail Fatigue Rating (DFR) method and finite element analysis of structure details, and the change curve of maximum stress of ground-air-ground versus the structure fatigue life is built. Secondly, the applicable ground-air-ground damage ratio is obtained through fatigue life retroestimation. Finally, the equivalent analysis spectrum which is equiamplitude spectrum is constructed. In an application example, the spectrum of using this method and the spectrum of the flight measurement are compared, and the following results can be obtained:this method is correct and effective.
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