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Author:

Jiachen Li (Jiachen Li.) | Yuchen Wei (Yuchen Wei.) | Hao Wu (Hao Wu.) | Xingyu Shen (Xingyu Shen.) | Mengqi Yuan (Mengqi Yuan.)

Abstract:

The high variability of shock in terrorist attacks poses a threat to people's lives and properties,neces-sitating the development of more effective protective structures.This study focuses on the angle gradient and proposes four different configurations of concave hexagonal honeycomb structures.The structures'macroscopic deformation behavior,stress-strain relationship,and energy dissipation characteristics are evaluated through quasi-static compression and Hopkinson pressure bar impact experiments.The study reveals that,under varying strain rates,the structures deform starting from the weak layer and exhibit significant interlayer separation.Additionally,interlayer shear slip becomes more pronounced with increasing strain rate.In terms of quasi-static compression,symmetric gradient structures demonstrate superior energy absorption,particularly the symmetric negative gradient structure(SNG-SMS)with a specific energy absorption of 13.77 J/cm3.For dynamic impact,unidirectional gradient structures exhibit exceptional energy absorption,particularly the unidirectional positive gradient honeycomb structure(UPG-SML)with outstanding mechanical properties.The angle gradient design plays a crucial role in determining the structure's stability and deformation mode during impact.Fewer interlayer separations result in a more pronounced negative Poisson's ratio effect and enhance the structure's energy ab-sorption capacity.These findings provide a foundation for the rational design and selection of seismic protection structures in different strain rate impact environments.

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Author Community:

  • [ 1 ] [Mengqi Yuan]State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Technology Chongqing Innovation Center,Chongqing 401120,China
  • [ 2 ] [Xingyu Shen]北京工业大学
  • [ 3 ] [Jiachen Li]北京工业大学
  • [ 4 ] [Yuchen Wei]Institute of Occupational Health,China Academy of Safety Science and Technology,Beijing 100012,China
  • [ 5 ] [Hao Wu]北京工业大学

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Source :

防务技术

ISSN: 2096-3459

Year: 2024

Issue: 6

Volume: 36

Page: 47-63

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count: -1

Chinese Cited Count:

30 Days PV: 9

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