Experimental crushing behavior and energy absorption of angular gradient honeycomb structures under quasi-static and dynamic compression  

作　　者：Jiachen Li Yuchen Wei Hao Wu Xingyu Shen Mengqi Yuan 

机构地区：[1]State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China [2]Institute of Occupational Health,China Academy of Safety Science and Technology,Beijing 100012,China [3]Beijing Institute of Technology Chongqing Innovation Center,Chongqing 401120,China

出　　处：《Defence Technology（防务技术）》2024年第6期47-63,共17页Defence Technology

基　　金：financially supported by National Natural Science Foundation of China,China (Grant No.52022012);National Key R&D Program for Young Scientists of China,China (Grant No.2022YFC3080900)。

摘　　要：The high variability of shock in terrorist attacks poses a threat to people's lives and properties,necessitating 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/cm~3.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 absorption capacity.These findings provide a foundation for the rational design and selection of seismic protection structures in different strain rate impact environments.

关 键 词：Negative Poisson's ratio Gradient honeycomb structure Quasi-static compression Dynamic impact Titanium alloy 

分 类 号：TU352[建筑科学—结构工程] E95[军事—军事工程]