Journal of Hebei University of Science and Technology (Oct 2022)

Study on out-of-plane impact performance of self-similar hierarchical quasi-honeycomb

  • Xiang LI,
  • ,
  • Mingjie CAI,
  • Xingxing XU,
  • Shaoguo ZHOU

DOI
https://doi.org/10.7535/hbkd.2022yx05004
Journal volume & issue
Vol. 43, no. 5
pp. 481 – 494

Abstract

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In order to improve the crush resistance of the traditional hexagonal honeycomb structures,based on the principle of bionics and considering the influence of hierarchical factors,a self-similar hierarchical quasi-honeycomb structure was proposed on the basis of the hexagonal honeycomb.With the specific energy absorption(SEA),initial peak crushing force(PCF) and crushing force efficiency(CFE) as the impact characteristics evaluation indicators,a theoretical model was established to predict the impact characteristics of the quasi-honeycomb structure according to the simplified super-folded unit theory.On the basis of this theoretical model,the effects of cell wall thickness t,cell wall length l and cell number n on the mean crushing force(MCF) and SEA of quasi-honeycomb structures under out-of-plane impact load were studied.The results show that under the condition of equal relative density,the SEA and CFE increase with the increase of the hierarchy.Among them,under the impact velocity of 10 m/s,compared with 0th</sup> order honeycomb,the CFE of the 1st</sup> order honeycomb and the 2nd</sup> order honeycomb increase by 21% and 40%,and the SEA increase by 11% and 28%,respectively.Under the condition of same wall thickness,the initial PCF increases obviously with the increasing of the hierarchy,but the improvement of SEA and CFE is more significant than PCF.Under the impact velocity of 10 m/s,compared with the 0th</sup> order honeycomb,the CFEs of the 1st</sup> order honeycomb and the 2nd</sup> order honeycomb increase by 77% and 115%,and the SEAs increase by 72% and 116%,respectively.The theoretical model can effectively predict the energy absorption performance parameters of quasi-honeycomb structures,thereby providing a theoretical reference for the study of honeycomb structure impact dynamics.

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