Guo Chunxia, Zhao Dong, Liu Zhanli, Ding Qian, Gao Haoqiang, Yan Qun, Sun Yongtao, Ren Fuguang
Department of Mechanics, School of Science, Xi'an University of Architecture & Technology, Xi'an 710055, China.
Applied Mechanics Laboratory, School of Aerospace Engineering, Tsinghua University, Beijing 100084, China.
Materials (Basel). 2021 Mar 11;14(6):1353. doi: 10.3390/ma14061353.
The synthesized understanding of the mechanical properties of negative Poisson's ratio (NPR) convex-concave honeycomb tubes (CCHTs) under quasi-static and dynamic compression loads is of great significance for their multifunctional applications in mechanical, aerospace, aircraft, and biomedical fields. In this paper, the quasi-static and dynamic compression tests of three kinds of 3D-printed NPR convex-concave honeycomb tubes are carried out. The sinusoidal honeycomb wall with equal mass is used to replace the cell wall structure of the conventional square honeycomb tube (CSHT). The influence of geometric morphology on the elastic modulus, peak force, energy absorption, and damage mode of the tube was discussed. The experimental results show that the NPR, peak force, failure mode, and energy absorption of CCHTs can be adjusted by changing the geometric topology of the sinusoidal element. Through the reasonable design of NPR, compared with the equal mass CSHTs, CCHTs could have the comprehensive advantages of relatively high stiffness and strength, enhanced energy absorption, and damage resistance. The results of this paper are expected to be meaningful for the optimization design of tubular structures widely used in mechanical, aerospace, vehicle, biomedical engineering, etc.
对负泊松比（NPR）凹凸蜂窝管（CCHT）在准静态和动态压缩载荷下力学性能的综合理解，对其在机械、航空航天、飞机和生物医学领域的多功能应用具有重要意义。本文对三种3D打印的NPR凹凸蜂窝管进行了准静态和动态压缩试验。采用质量相等的正弦蜂窝壁代替传统方形蜂窝管（CSHT）的胞壁结构。讨论了几何形态对管材弹性模量、峰值力、能量吸收和破坏模式的影响。实验结果表明，通过改变正弦单元的几何拓扑结构，可以调整CCHT的NPR、峰值力、失效模式和能量吸收。通过合理设计NPR，与等质量的CSHT相比，CCHT具有较高的刚度和强度、增强的能量吸收和抗损伤能力等综合优势。本文结果有望为机械、航空航天、车辆、生物医学工程等广泛应用的管状结构的优化设计提供参考。
