Volume 42 Issue 12
Dec.  2017
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SHI Xiaofei, XI Ping, SONG Yuwang, et al. Stress concentration analysis of honeycomb with missing cell walls[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(12): 2662-2668. doi: 10.13700/j.bh.1001-5965.2015.0819(in Chinese)
Citation: SHI Xiaofei, XI Ping, SONG Yuwang, et al. Stress concentration analysis of honeycomb with missing cell walls[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(12): 2662-2668. doi: 10.13700/j.bh.1001-5965.2015.0819(in Chinese)

Stress concentration analysis of honeycomb with missing cell walls

doi: 10.13700/j.bh.1001-5965.2015.0819
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  • Corresponding author: Tel.:010-82316747, E-mail:xiping@buaa.edu.cn
  • Received Date: 17 Dec 2015
  • Accepted Date: 18 Mar 2016
  • Publish Date: 20 Dec 2017
  • A kind of defect with some of the cell walls missing in a honeycomb structure causes the loss of continuum of the honeycomb, and thus results in the stress concentration around the defect tip. Combined with the finite element and the analytic methods, this paper analyzed the normal stresses distribution on the cell wall at the defect tip in meso-scale. The finite element results of the tensile stress of the cell walls are obtained first. The results shows that the x-directional stress distribution in the stress concentration strip area fits the probability distribution function of the quasi chi square distribution. There exists a band zone in which the normal stress is much higher than the rest of areas. The distribution of the normal stress of cell walls conform the in the band; there also exists a critical position at which the variation trend of distribution function inverses; secondly, the relation between moments of cell wall and the number of the missing walls is analytically researched. At last. a prediction equation of the bending stress is developed and the influence of defect shape on formula is analyzed.

     

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