强化型内凹蜂窝的力学特性研究  

Research on the mechanical performance of enhanced re-entrant honeycomb

作　　者：程志伟 侯秀慧[2,3] CHENG Zhiwei;HOU Xiuhui(School of Aeronautics and Astronautics,Zhejiang University,310058 Hangzhou,China;School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,710072 Xi'an,China;MIIT Key Laboratory of Dynamics and Control of Complex Systems,710072 Xi'an,China)

机构地区：[1]浙江大学航空航天学院,杭州310058 [2]西北工业大学力学与土木建筑学院,西安710072 [3]复杂系统动力学与控制工业和信息化部重点实验室,西安710072

出　　处：《应用力学学报》2025年第2期323-331,共9页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目(No.11972287,11872303)。

摘　　要：在内凹六边形蜂窝(re-entrant hexagonal honeycomb,RHH)构型的基础上,通过往其胞元内部嵌入斜撑结构,提出了一种强化型的内凹蜂窝(enhanced re-entrant honeycomb,ERH)结构。通过准静态压缩试验研究了其静力学性能,揭示了ERH单胞的变形机制。采用有限元模拟的方法,对ERH在低速(10 m/s)和高速(100 m/s)冲击载荷作用下的动力学响应进行了研究,具体分析了其变形模式、动态泊松比以及能量吸收能力等。研究发现,往胞元内部嵌入斜撑结构,对原结构的负泊松比特性不会产生很大的影响,反而能够增强蜂窝结构抵抗冲击变形的能力。通过对2种蜂窝结构比吸能的对比分析可知,ERH单位质量吸收的能量较RHH在低速和高速冲击载荷下分别能提高38.53%和13.85%,说明嵌入的斜撑结构同样能提高蜂窝结构的能量吸收能力。Based on the re-entrant hexagonal honeycomb(RHH)configuration,an enhanced re-entrant honeycomb structure(ERH)was proposed by embedding the diagonal struts into its cell.Static mechanical performances of ERH were investigated by quasi-static compression test,and the deformation mechanism of unit cell was revealed.Dynamic responses of ERH under low speed(10 m/s)and high speed(100 m/s)impact loads were studied by finite element simulation.The deformation modes,dynamic Poisson's ratio and energy absorption capacity were analyzed in detail.It is found that the embedment of diagonal struts into the cell can enhance the resistance of the honeycomb structure under low speed impact loads with no great influence on the negative Poisson's ratio effect of the original structure.Compared with RHH,the energy absorbed per unit mass of ERH can be increased by 38.53% and 13.85%,respectively,under low and high speed impact loads,indicating that the embedded diagonal struts can also improve the energy absorption capacity of the honeycomb structure.

关 键 词：负泊松比蜂窝 准静态压缩 面内冲击 变形模式 比吸能 

分 类 号：O341[理学—固体力学]