模块化多孔结构的变形模式及吸能特性  

Deformation Mode and Energy Absorption of Modularized Cellular Structures

作　　者：黄巧巧 邓庆田[1] 李新波[1] 陈丽 HUANG Qiaoqiao;DENG Qingtian;LI Xinbo;CHEN Li(School of Science,Chang’an University,Xi’an 710064,Shaanxi,China)

机构地区：[1]长安大学理学院,陕西西安710064

出　　处：《高压物理学报》2024年第6期77-88,共12页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(52078419);国家自然科学基金委-中国工程物理研究院NSAF联合基金(U1930204)。

摘　　要：模块化多孔结构相较于传统一体式结构能够更加灵活地满足装配需求,研究其变形模式和吸能特性,可为多孔结构在工程中的应用提供新思路。选用具有正泊松比效应的正六边形和具有负泊松比效应的内凹形作为模块化多孔结构的填充单元,共设计了8种结构,并进行了准静态压缩实验。实验结果与有限元模拟计算结果吻合良好。研究发现:不同填充方式的结构具有不同的变形模式,其中正六边形填充表现出明显的剪切破坏带,交替填充能较好地保持单元的初始形状;2层填充多孔结构的压缩力峰值均大于3层填充结构,2层结构的比吸能也大于对应的3层填充结构;正六边形填充结构的总吸能、平均压缩力和比吸能在4种填充方式中均最小;内凹形填充结构的总吸能和平均压缩力均最大,且其比吸能保持在稳定且较高的水平。Compared with the traditional integrated structures,modularized cellular structures can meet the assembly requirements more flexibly.The deformation modes and energy absorption were studied to provide new ideas for the application of cellular structures in engineering,the regular hexagon with positive Poisson’s ratio effect and the re-entrant hexagon with negative Poisson’s ratio effect were selected as the infill units of the modularized cellular structures in this paper,and eight kinds of structures were designed for quasi-static compression experiments.The experimental results were in good agreement with the simulation results.The cellular structures with different infill approaches had different deformation modes under the compression experiments,in which the regular hexagon infill units showed obvious shear failure bands,and the alternate infill approaches can maintain the original units shape.The peak force of the two-layer infill cellular structures were greater than the three-layer infill structures,and the specific absorption energy were greater than the corresponding three-layer infill structures.The total absorption energy,average compression force and specific absorption energy of the hexagon infill structures were always the smallest among the four infill approaches,while the total absorption energy and average compression force of the re-entrant hexagon infill structures were always the largest and the specific absorption energy was kept at a stable and high level.

关 键 词：模块化 多孔结构 负泊松比 正泊松比 变形模式 吸能特性 

分 类 号：O347[理学—固体力学] O521.9[理学—力学]