A 3D Mechanism-driven Hexagonal Metamaterial: Evaluation of Auxetic Behavior
A 3D Mechanism-driven Hexagonal Metamaterial: Evaluation of Auxetic Behavior
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DOI：
10.1016/j.ijmecsci.2021.106699
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发表时间：
2021-11
影响因子：
7.3
通讯作者：
Yutai Su;Xianchen Xu;Jing Shi;Guoliang Huang
中科院分区：
文献类型：
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作者：
Yutai Su;Xianchen Xu;Jing Shi;Guoliang Huang
本文研究了一种通过独特的滑动机制实现的非常规3D可打印拉胀超材料。提出了三维滑动诱导六边形拉胀（SIHA）超材料的概念，与传统的凹腔结构相比，SIHA超材料具有稳定的拉胀行为和改善的压缩载荷响应。针对单个SIHA晶格单元，建立了有关滑动机理的理论模型，并通过有限元分析和实验进行了验证。此外，通过有限元分析和实验验证，周期SIHA结构的压缩性能进行了评估。一个3D的传统再入蜂窝（REH）的结构进行比较。结果表明，有限元分析结果与试验结果吻合较好，SIHA结构具有较高的抗压强度和较稳定的拉胀性能，具有较好的整体上级性能。此外，性能相对于滑动机构中的摩擦系数的灵敏度进行了研究。研究发现，SIHA超材料的性能和拉胀行为对摩擦条件非常敏感。力-应变曲线随输入摩擦系数的增大而增大，过大的摩擦系数会对滑移机制产生不良影响。总的来说，摩擦滑动和倒塌的结构机构驱动的结构可以提供一种新的方式来捕获压缩变形下的弹性能量。
This paper investigates an unconventional 3D printable auxetic metamaterial realized by a unique sliding mechanism. The concept of 3D sliding induced hexagonal auxetic (SIHA) metamaterial is proposed with stable auxetic behavior and improved compression load response, as compared with the conventional re-entrant structure. For a single SIHA lattice cell, the theoretical model concerning the sliding mechanism is developed and verified by both finite element analysis (FEA) and experiment. Furthermore, the compression properties of the periodic SIHA structure are evaluated by FEA with experimental verification. A 3D conventional re-entrant honeycomb (REH) structure is adopted for comparison. It is shown that the FEA results agree with the experimental results, and overall superior performance of SIHA structure is obtained, which is reflected by higher compression resistance and more stable auxetic behavior. Moreover, the sensitivity of performance with respect to the friction coefficient in the sliding mechanism is investigated. It is found that the performance and auxetic behavior of the SIHA metamaterial is sensitive to the friction condition. Force-strain curve increases with the input friction coefficient, while an excessive friction coefficient may cause undesirable effects on the slip mechanism. Overall, the friction sliding and collapsing structural mechanism-driven structures could provide a new way to entrap elastic energy under compression deformations.