The Power Spectrum Density (PSD) of the radial connection bolts of an aircraft in the random vibration environment was obtained combing finite element analysis with test data. The linear relationship between load and stress based on the bending effect was adopted to obtain the nominal stress PSD of root part of radial connection bolt. The peak value probability density and the expected wave crest number in the stress stochastic process were obtained by using Dirlik empirical formula. Based on the Miner fatigue damage theory and the material S-N curve revised by the stress concentration coefficient, the vibration fatigue life of root part of radial connection bolt was estimated. The result was consistent with the countersunk bolt fracture in the random vibration test. It is confirmed that the reason for connection bolt fracture was low frequency resonance fatigue.
QU Shaoqi
,
SUN Yingchao
,
WU Henggui
,
LI Yanping
,
ZHANG Wei
. Analysis of vibration fracture of radial connection bolt of aircraft[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021
, 42(5)
: 524431
-524431
.
DOI: 10.7527/S1000-6893.2020.24431
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