Additively manufactured dual-functional metamaterials with customisable mechanical and sound-absorbing properties
Additively manufactured dual-functional metamaterials with customisable mechanical and sound-absorbing properties
复制标题
增材制造的双功能超材料，具有可定制的机械和吸音特性
DOI：
10.1080/17452759.2022.2085119
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发表时间：
2022-06-10
影响因子：
10.6
通讯作者：
Wang, Zhonggang
中科院分区：
文献类型：
--
作者：
Li, Zhendong;Zhai, Wei;Wang, Zhonggang
摘要 具有宽带吸声能力的声学超材料开辟了航空航天、汽车、海洋、国防等领域的应用。对于这些应用，能够承受复杂负载条件的吸声材料至关重要。因此，为了同时满足声学和机械要求，我们提出了板增强双功能微晶格超材料（PDMM），该超材料具有弹性各向同性、比能量吸收高达25.82 kJ/kg的双破碎级以及从0.97 kHz至6.30 kHz的超宽带吸声能力。显着的弹性各向同性在于拓扑引起的结构刚度均化效应。从单平台抗压阶段到双平台抗压阶段的过渡是通过调整结构局部强度来控制的。通过调制并联耦合和级联谐振效应实现按需宽带吸声，并通过检查阻抗匹配和系统阻尼状态揭示物理机制。总体而言，所提出的新型超材料通过克服传统机械和声学超材料中通常存在的权衡而表现出非凡的应用潜力。
ABSTRACT Acoustic metamaterials with broadband sound-absorbing capacity open up applications in aerospace, automotive, marine, defense, etc. For such applications, sound-absorbing materials that can withstand complex loading conditions are essential. Hence, to address acoustic and mechanical requirements simultaneously, we propose plate-reinforced dual-functional micro-lattice metamaterials (PDMMs) that exhibit elastic isotropy, dual crushing stages with a specific energy absorption up to 25.82 kJ/kg, and ultra-broadband sound absorption from 0.97 kHz to 6.30 kHz. The remarkable elastic isotropy lies in the topology-induced structural stiffness homogenising effect. The transition from single to dual plateau anti-compression stages is controlled by tailoring the structural local strength. On-demand broadband sound absorption is achieved by modulating the parallel coupling and cascade resonance effects, and the physical mechanism is revealed by examining impedance matching and system damping states. Overall, the presented novel metamaterials exhibit exceptional application potentials by overcoming the trade-offs usually found in traditional mechanical and acoustic metamaterials.