Influence of parameter estimates of Weibull distributions on detail fatigue rating

SONG Xin; SHEN Hua; CHEN Longbao; LI Tianyu

doi:10.7527/S1000-6893.2020.24759

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2021 , Vol. 42 >Issue 3: 224759 - 224759

DOI: https://doi.org/10.7527/S1000-6893.2020.24759

Solid Mechanics and Vehicle Conceptual Design

Influence of parameter estimates of Weibull distributions on detail fatigue rating

SONG Xin ,
SHEN Hua ,
CHEN Longbao ,
LI Tianyu

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School of Mechanical Power Engineering, Harbin University of Science and Technology, Harbin 150080, China

Received date: 2020-09-16

Revised date: 2020-10-16

Online published: 2020-12-08

Supported by

Civil Aircraft Special Item of Ministry of Industry (MJZ-2017-F-13)

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Abstract

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%.

Key words： fatigue analysis; structure details; detail fatigue rating; three parameters Weibull distribution; parameter estimation; sensitivity analysis

Cite this article

SONG Xin , SHEN Hua , CHEN Longbao , LI Tianyu . Influence of parameter estimates of Weibull distributions on detail fatigue rating[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021 , 42(3) : 224759 -224759 . DOI: 10.7527/S1000-6893.2020.24759

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