Shen Lumin, Wu Yuanzhi, Ye Tuo, Gao Tianyu, Zheng Shanmei, Long Zhihao, Ren Xi, Zhang Huangyou, Huang Junwen, Liu Kai
College of Intelligent Manufacturing and Mechanical Engineering, Hunan Institute of Technology, Hengyang 421002, China.
School of Traffic & Transportation Engineering, Central South University, Changsha 410075, China.
Materials (Basel). 2024 Oct 10;17(20):4950. doi: 10.3390/ma17204950.
The integration of biomimetic principles into the sophisticated design of honeycomb structures has gained significant traction. Inspired by the natural reinforcement mechanisms observed in tree stems, this research introduces localized thickening to the conventional honeycombs, leading to the development of variable-density honeycomb blocks. These blocks are strategically configured to form modular honeycombs. Initially, the methodology for calculating the relative density of the new design is meticulously detailed. Following this, a numerical model based on the plastic limit theorem, verified experimentally, is used to investigate the in-plane deformation models of modular honeycomb under the low- and high-velocity impact and to establish a theoretical framework for compressive strength. The results confirm that the theoretical predictions for crushing strength in the modular honeycomb align closely with numerical findings across both low- and high-velocity impacts. Further investigation into densification strain, energy absorption, and gradient strategy is conducted using both simulation and experimental approaches. The outcomes indicate that the innovative design outperforms conventional honeycombs by significantly enhancing the crushing strength under low-velocity impacts through the judicious arrangement of honeycomb blocks. Additionally, with a negligible difference in densification strains, the modular honeycomb demonstrates superior energy dissipation capabilities compared to its conventional counterparts. At a strain of 0.85, the modular honeycomb's energy absorption capacity improves by 36.68% at 1 m/s and 25.47% at 10 m/s compared to the conventional honeycomb. By meticulously engineering the arrangement of sub-honeycombs, it is possible to develop a modular honeycomb that exhibits a multi-plateau stress response under uniaxial and biaxial compression. These advancements are particularly beneficial to the development of auto crash absorption systems, high-end product transportation packaging, and personalized protective gear.
将仿生原理融入蜂窝结构的精密设计已获得显著关注。受树干中观察到的自然增强机制启发，本研究对传统蜂窝引入局部加厚，从而开发出可变密度蜂窝块。这些块经过策略性配置以形成模块化蜂窝。首先，详细阐述了计算新设计相对密度的方法。在此之后，基于塑性极限定理并经实验验证的数值模型，用于研究模块化蜂窝在低速和高速冲击下的面内变形模型，并建立抗压强度的理论框架。结果证实，模块化蜂窝抗压强度的理论预测与低速和高速冲击下的数值结果紧密吻合。使用模拟和实验方法对致密化应变、能量吸收和梯度策略进行了进一步研究。结果表明，通过明智地布置蜂窝块，创新设计在低速冲击下显著提高抗压强度，从而优于传统蜂窝。此外，在致密化应变差异可忽略不计的情况下，模块化蜂窝相较于传统蜂窝展现出卓越的能量耗散能力。在应变达到0.85时，与传统蜂窝相比，模块化蜂窝在1米/秒时能量吸收能力提高36.68%，在10米/秒时提高25.47%。通过精心设计子蜂窝的排列，可以开发出在单轴和双轴压缩下呈现多平台应力响应的模块化蜂窝。这些进展对汽车碰撞吸收系统、高端产品运输包装和个性化防护装备的发展尤为有益。
