北京航空航天大学学报 ›› 2003, Vol. 29 ›› Issue (3): 218-220.

• 论文 • 上一篇    下一篇

谱载下基于模糊Miner法则的疲劳寿命估算

贾星兰, 刘文   

  1. 北京航空航天大学 飞行器设计与应用力学系
  • 收稿日期:2001-09-28 出版日期:2003-03-31 发布日期:2010-09-27
  • 作者简介:贾星兰(1965-),男,山东菏泽人,博士生,100083,北京.

Fatigue Life Estimation of Specimen under Spectrum LoadUsing Fuzzy Miners Rule

Jia Xinglan, Liu Wenting   

  1. Dept. of Flight Vehicle Design and Applied Mechanics, Beijing University of Aeronautics and Astronautics
  • Received:2001-09-28 Online:2003-03-31 Published:2010-09-27

摘要: 在载荷谱中,当疲劳应力稍低于疲劳极限时,对构件是否造成损伤呈现出某种"模糊"过渡状态.运用模糊数学的隶属函数,建立了考虑"模糊"损伤状态的Miner法则.按照常规Miner法则和模糊Miner法则,分别给出了程序块谱作用下疲劳寿命的估算公式.实例估算与试验结果的对比表明:采用模糊Miner法则,可使疲劳寿命的估算误差减少18.33%.

Abstract: Fatigue damage exhibits some "fuzzy" character when the fatigue stress in load spectrum is lower slightly than fatigue limit. A Miner-s rule considering this "fuzzy" damage character is established by means of membership function of fuzzy mathematics. When a specimen is subjected to programmed spectrum loads, the estimation formula of fatigue life is derived according to regular Miner's rule and fuzzy Miner's rule. Comparing the results of calculations and fatigue experiments, it is shown that the estimation error of fatigue life is decreased by 18.33% with using fuzzy Miner's rule.

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