Influence of parameter estimates of Weibull distributions on detail fatigue rating

被引：0
作者：
Song X. [1 ]
Shen H. [1 ]
Chen L. [1 ]
Li T. [1 ]
机构：
[1] School of Mechanical Power Engineering, Harbin University of Science and Technology, Harbin
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2021年 / 42卷 / 03期
关键词：
Detail fatigue rating; Fatigue analysis; Parameter estimation; Sensitivity analysis; Structure details; Three parameters Weibull distribution;
D O I：
10.7527/S1000-6893.2020.24759
中图分类号：
学科分类号：
摘要：
When applying new materials and new processes to the structural design of civil aircraft, the Detail Fatigue Rating (DFR) method is still an important evaluation method. According to the fatigue test data of the new aluminum alloy, the influence of shape parameters of Weibull distributions on the DFR calculation parameters is comprehensively analyzed. When analyzing the influence of the slope parameter of standard S-N curves on the DFR, the change of the reliability life should be considered, and this influence of can be reduced by calculating the value of low reliability life. The differences between the DFR calculation based on different distribution parameter estimates and that based on the traditional Boeing's given values are compared. The results show that for the experimental data that passed the conformity test, the DFR calculated by using the parameter estimation values of different Weibull distributions is greater than that calculated by the traditional method with the given value of Boeing Company. Among them, the DFR calculated by three parameter Weibull distribution is the largest, increasing by at least 10%. © 2021, Beihang University Aerospace Knowledge Press. All right reserved.
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