STUDY ON FATIGUE SCATTER FACTOR OF AIRCRAFT STRUCTURE UNDER DURABILITY SEVERE LOAD SPECTRUM

WANG YongJun; LI Tang; DUI HongNa

doi:10.16579/j.issn.1001.9669.2021.04.026

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STUDY ON FATIGUE SCATTER FACTOR OF AIRCRAFT STRUCTURE UNDER DURABILITY SEVERE LOAD SPECTRUM

更新时间：2022-09-22

- STUDY ON FATIGUE SCATTER FACTOR OF AIRCRAFT STRUCTURE UNDER DURABILITY SEVERE LOAD SPECTRUM
- Journal of Mechanical Strength Vol. 43, Issue 4, Pages: 955-959(2021)
- 作者机构：
  
  1. 成都飞机设计研究所
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2021.04.026
  CLC：
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WANG YongJun, LI Tang, DUI HongNa. STUDY ON FATIGUE SCATTER FACTOR OF AIRCRAFT STRUCTURE UNDER DURABILITY SEVERE LOAD SPECTRUM. [J]. 43(4):955-959(2021)
DOI：

WANG YongJun, LI Tang, DUI HongNa. STUDY ON FATIGUE SCATTER FACTOR OF AIRCRAFT STRUCTURE UNDER DURABILITY SEVERE LOAD SPECTRUM. [J]. 43(4):955-959(2021) DOI： 10.16579/j.issn.1001.9669.2021.04.026.

摘要

疲劳分散系数是使用载荷谱下的飞机结构寿命可靠性指标,用于描述疲劳分析和试验结果的可靠度。军用飞机结构强度规范(GJB67.6-2008)规定,当采用平均谱进行耐久性分析时,分散系数一般取4,对应99.9%可靠度;而当采用严重谱进行分析时,分散系数在2～4之间,但具体值并未明确。参考了大量的相关资料,在载荷谱造成的疲劳损伤与结构临界损伤值均服从对数正态分布前提下,对疲劳分散系数进行理论推导,并结合疲劳试验寿命分散性研究结果,明确了耐久性严重谱下结构寿命的疲劳分散系数,为国内将耐久性严重谱应用于军机结构疲劳设计和全尺寸疲劳试验打下了基础。

Abstract

Fatigue scatter factor is the reliability index of aircraft structure life,which is used to describe the reliability of analysis and test results. When average spectrum is used for durability analysis,the scatter factor is generally set as 4,corresponding to 99. 9% reliability. In the case of using severe spectrum,the scatter factor is between 2 and 4,but the specific value is not clear in aircraft strength specification. By referring to a larger number of relevant research and according to the results of scatter study on component-level fatigue tests,the fatigue scatter factor of aircraft structures under severe spectrum was clarified,which lays a foundation for the application of durability severe spectrum in fatigue design and full-scale test of military aircraft.

关键词

疲劳分散系数严重谱可靠性疲劳寿命全尺寸疲劳试验

Keywords

Fatigue scatter factorSevere load spectrumReliabilityFatigue lifeFull-scale fatigue test（FSFT）

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Related Author

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Related Institution

College of Mechanical and Electrical Engineering,Shaanxi University of Science ＆ Technology

Chengdu Aircraft Industrial (Group) Co., Ltd.

Civil Aviation College, Nanjing University of Aeronautics and Astronautics

College of General Aviation and Flight, Nanjing University of Aeronautics and Astronautics

School of Mechanical Engineering, Hebei University of Technology

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