航空学报 > 2017, Vol. 38 Issue (S1): 721577-721577   doi: 10.7527/S1000-6893.2017.721577

固体力学与飞行器总体设计

疲劳开裂结构等效分析谱构造方法

雷晓欣, 张彦军, 纪露明, 朱亮   

  1. 中航工业第一飞机设计研究院, 西安 710089
  • 收稿日期:2017-05-25 修回日期:2017-07-17 出版日期:2017-11-30 发布日期:2017-07-17
  • 通讯作者: 雷晓欣 E-mail:rentian1234@126.com

Equivalent analysis spectrum construction method for aircraft structure containing cracks

LEI Xiaoxin, ZHANG Yanjun, JI Luming, ZHU Liang   

  1. AVIC the First Aircraft Institute, Xi'an 710089, China
  • Received:2017-05-25 Revised:2017-07-17 Online:2017-11-30 Published:2017-07-17

摘要:

为了解决外场疲劳裂纹排故中结构疲劳载荷谱数据不全或过于复杂的问题,提出了一种适用于飞机外场疲劳开裂结构的等效分析谱构造方法。该方法以细节疲劳额定值(DFR)法和结构细节有限元分析为基础,构建地—空—地最大应力与结构疲劳寿命的变化曲线,进而通过寿命反推,获取适用的地—空—地损伤比,以此构建等效分析谱,谱型为等幅谱。通过应用实例,将该方法构造的载荷谱与实测谱进行了对比,确认了该方法的正确性和有效性。

关键词: 疲劳, 载荷谱, 地—空—地损伤比, 实测谱, 开裂结构

Abstract:

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.

Key words: fatigue, load spectrum, ground-air-ground damage ratio, actual load spectrum, structure containing cracks

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