https://orcid.org/0000-0003-1265-2762
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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.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Data availability statement
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Notes on contributors
Zhendong Li
Mr. Zhendong Li is a Ph.D. candidate in the School of Traffic & Transportation Engineering in Central South University. He studies the additive manufacturing technologies in National University of Singapore. His research interests are multi-functional materials, additive manufacturing, etc.
Wei Zhai
Dr. Wei Zhai is an assistant professor at the Department of Mechanical Engineering, National University of Singapore. She received her Ph.D. from the Department of Engineering, University of Cambridge, in 2015. She leads a research group on nature-inspired advanced materials engineering via multi-scale and multi-material advanced manufacturing technologies, such as 3D printing, freeze casting, template replication, etc. She has developed advanced materials for lightweight, acoustic, electromagnetic, flexible electronics, and biomedical device applications.
Xinwei Li
Dr. Xinwei Li is a research fellow at the Department of Mechanical Engineering in the National University of Singapore. He had received his Ph.D. in the field of materials science and engineering, with a thesis on additively manufactured metallic lattice structures, from the National University of Singapore in 2020. His research interests include additive manufacturing, lattice structures, bioinspired composites, finite element modelling, and materials physics, with focuses on lightweight, energy absorption, and acoustics applications.
Xiang Yu
Dr. Xiang Yu currently works as a research scientist III at the Institute of High Performance Computing, A*STAR. He received his B.Eng and Ph.D from the Department of Mechanical Engineering, the Hong Kong Polytechnic University. His research interests include vibroacoustic modeling, sound and vibration control, acoustic metamaterials, advanced functional materials, etc.
Zichao Guo
Mr. Zichao Guo is a postgraduate in Central South University and he studies the acoustic metamaterials and modeling.
Zhonggang Wang
Dr. Zhonggang Wang is a professor in Central South University. He leads a research group on impact dynamics, multi-physics coupling and control, novel composites, hierarchical materials, advanced functional materials, etc.