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Volume 42 Issue 5
May  2016
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Journal of Beijing University of Aeronautics and Astronautics  > 2016  >  42(5): 865-870.
HE Xiaofan, SUI Fangyuan, WANG Tianshuai, et al. Crack initiation approach for durability analysis on aircraft structures of a fleet[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(5): 865-870. doi: 10.13700/j.bh.1001-5965.2015.0368(in Chinese)
Citation: HE Xiaofan, SUI Fangyuan, WANG Tianshuai, et al. Crack initiation approach for durability analysis on aircraft structures of a fleet[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(5): 865-870. doi: 10.13700/j.bh.1001-5965.2015.0368(in Chinese)
shu

Crack initiation approach for durability analysis on aircraft structures of a fleet

doi: 10.13700/j.bh.1001-5965.2015.0368
  • 1.

    School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

  • 2. School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics, Beijing 10008

  • 3. Aviation Industry Corporation of China, Beijing 100022, China

  • Received Date: 04 Jun 2015
  • Publish Date: 20 May 2016
    Abstract
  • The variability of structural properties and load spectra should be accounted for to evaluate the durability life for a fleet by the crack initiation approach (CIA), but the method to determine the life standard deviation considering the variability of structural properties and load spectra is not clear. Therefore, a durability test was conducted for the specimens of 7B04 T74 aluminum alloys stimulating the structure details of a fighter under three individual load spectra of a fleet, from which the lead crack growth data have been observed in fractograph. As a result, the parameters of P-S-N curve for this structural detail are back-extrapolated. Statistical analysis shows that the variability of load spectra has no obvious influence on the P-S-N parameters corresponding to those three load spectra. An equivalent P-S-N curve and parameter estimated method have been presented to describe the influence of load spectra in a fleet. The probability of crack exceedance is derived and the extent of damage is evaluated. Consequently, a CIA is developed accounting for both the variability of load spectra and of structural properties.

     

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