Tao Yong, Chen Xiyu, Lu Siping
School of Civil Engineering, Central South University, Changsha 410075, China.
Polymers (Basel). 2025 Mar 24;17(7):862. doi: 10.3390/polym17070862.
Many studies show that hierarchical honeycombs have a superior performance compared to regular honeycombs. However, relevant experimental studies are limited due to the fabrication challenges of hierarchical honeycombs featuring complex geometries. In this study, circular-vertex-based hierarchical hexagonal honeycombs (CHHHs) with different hierarchical parameters were fabricated using a polymeric 3D-printing technique, and their quasi-static out-of-plane mechanical behavior was investigated. The CHHHs were constructed by replacing each solid vertex of a regular hexagonal honeycomb (RHH) with a circular vertex. Quasi-static compression tests were conducted on CHHHs, and the effect of the hierarchical parameter on the deformation modes, mechanical properties, and energy absorption characteristics was investigated. The results revealed that both the CHHH and RHH specimens experienced cell wall fractures during compression, while the CHHH exhibited enhanced damage resistance, compressive strength, and specific energy absorption (SEA) compared to RHH. This study contributes to understanding the effect of circular-vertex-based hierarchy on the out-of-plane mechanical behavior of regular honeycombs.
许多研究表明，与常规蜂窝相比，分层蜂窝具有更优异的性能。然而，由于具有复杂几何形状的分层蜂窝在制造方面存在挑战，相关的实验研究有限。在本研究中，使用聚合物3D打印技术制造了具有不同分层参数的基于圆形顶点的分层六边形蜂窝（CHHHs），并研究了它们的准静态面外力学行为。CHHHs是通过用圆形顶点替换常规六边形蜂窝（RHH）的每个实心顶点而构建的。对CHHHs进行了准静态压缩试验，并研究了分层参数对变形模式、力学性能和能量吸收特性的影响。结果表明，CHHH和RHH试样在压缩过程中均出现了胞壁断裂，而与RHH相比，CHHH表现出更高的抗损伤能力、抗压强度和比能量吸收（SEA）。本研究有助于理解基于圆形顶点的分层结构对常规蜂窝面外力学行为的影响。
