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Volume 41 Issue 3
Mar.  2015
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Journal of Beijing University of Aeronautics and Astronautics  > 2015  >  41(3): 523-529.
XIAO Hao, HU Weiping, ZHANG Miao, et al. Post-buckling damage analysis and fatigue life prediction of thin plate[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(3): 523-529. doi: 10.13700/j.bh.1001-5965.2014.0174(in Chinese)
Citation: XIAO Hao, HU Weiping, ZHANG Miao, et al. Post-buckling damage analysis and fatigue life prediction of thin plate[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(3): 523-529. doi: 10.13700/j.bh.1001-5965.2014.0174(in Chinese)
shu

Post-buckling damage analysis and fatigue life prediction of thin plate

doi: 10.13700/j.bh.1001-5965.2014.0174
  • 1.

    School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • 2. China Academy of Space Technology, Beijing 100094, China

  • Received Date: 03 Apr 2014
  • Publish Date: 20 Mar 2015
    Abstract
  • Post-buckling damage of thin plate under compressive load in plan was studied, and the fatigue life of plate was predicted by taking the coupling effect of buckling and fatigue damage into account. Firstly, the finite element model was established, and the critical buckling load and buckling mode were obtained by linear buckling analysis, then the large deflection theory was adopted, first order buckling mode was applied as the initial displacement perturbation, and the corresponding critical buckling load was determined by nonlinear bucking analysis of thin plate. Secondly, damage evolution equation of thin plate material under monotonic loading was established based on damage mechanics theory and method, and parameters of damage evolution were obtained by the parameter identification based on the material fatigue test results. Post-bucking damage was analyzed base on nonlinear bucking analysis results and damage evolution equations. Finally, the effect of fatigue load was took into consideration, finite element numerical method was used to solve the problem based on damage mechanics theory, considering the coupling effect of the damage caused by load each time and post-bucking stress strain fields analyze, the fatigue life of the structure was achieved by repeating iterative computations. The research provides a new method and a practical means for the analysis of post-buckling damage and fatigue life considering post-buckling damage of engineering structures.

     

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