On the elastodynamic properties of octet truss-based architected metamaterials
On the elastodynamic properties of octet truss-based architected metamaterials
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DOI：
10.1063/5.0140673
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发表时间：
2023-04
影响因子：
4
通讯作者：
M. Oudich;Edward Huang;Hyeonu Heo;Zhenpeng Xu;Huachen Cui;N. J. Gerard;X. Zheng;Yun Jing
中科院分区：
文献类型：
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作者：
M. Oudich;Edward Huang;Hyeonu Heo;Zhenpeng Xu;Huachen Cui;N. J. Gerard;X. Zheng;Yun Jing
由于增材制造技术的快速发展，使得具有优异机械性能的人造材料成为材料科学和力学领域的核心课题。这封信试图研究八元桁架晶格的弹性动力学行为，作为一种重要的建筑超材料的高有效强度和振动屏蔽。我们设计、制造和实验表征了三种类型的八元桁架结构，包括两种具有薄或厚支柱的均匀结构和一种具有交替支柱厚度的混合结构。高弹性波透射率被观察到具有厚杆的晶格，而强振动减缓是从具有薄杆的均匀八柱桁架结构以及混合八柱桁架晶格中捕获的，尽管衰减的潜在机制是根本不同的（粘弹性诱导阻尼vs带隙）。还进行了压缩试验，以评估三个格的有效刚度。该研究为高机械强度的多功能结构超振材料的研制开辟了道路。
Architected metamaterials have emerged as a central topic in materials science and mechanics, thanks to the rapid development of additive manufacturing techniques, which have enabled artificial materials with outstanding mechanical properties. This Letter seeks to investigate the elastodynamic behavior of octet truss lattices as an important type of architected metamaterials for high effective strength and vibration shielding. We design, fabricate, and experimentally characterize three types of octet truss structures, including two homogenous structures with either thin or thick struts and one hybrid structure with alternating strut thickness. High elastic wave transmission rate is observed for the lattice with thick struts, while strong vibration mitigation is captured from the homogenous octet truss structure with thin struts as well as the hybrid octet truss lattice, though the underlying mechanisms for attenuation are fundamentally different (viscoelasticity induced dampening vs bandgaps). Compressional tests are also conducted to evaluate the effective stiffness of the three lattices. This study could open an avenue toward multifunctional architected metamaterials for vibration shielding with high mechanical strength.