Broadband low-frequency vibration attenuation in 3D printed composite meta-lattice sandwich structures

Achieving superior properties of vibration suppression at low-frequency range, yet with high load-bearing capabilities in lightweight structural designs is still a challenge. In this work, we propose a strategy to realize broadband low-frequency vibration bandgaps by combining the design concepts of...

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Veröffentlicht in:Composites. Part B, Engineering Engineering, 2021-06, Vol.215, p.108772, Article 108772
Hauptverfasser: Li, Hao, Hu, Yabin, Huang, Heyuan, Chen, Jianlin, Zhao, Meiying, Li, Bing
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Sprache:eng
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Zusammenfassung:Achieving superior properties of vibration suppression at low-frequency range, yet with high load-bearing capabilities in lightweight structural designs is still a challenge. In this work, we propose a strategy to realize broadband low-frequency vibration bandgaps by combining the design concepts of locally resonant metamaterials and lightweight lattice-truss-core sandwich structures. Two kinds of meta-lattice sandwich panels consisting of single/double-layer pyramidal truss-cores are designed, and the 3D printing technique of selective laser sintering (SLS) is applied to fabricate the dissipative composite meta-structures. The vibration suppression performance and bandgap generation mechanisms are theoretically, numerically, and experimentally investigated. Remarkable vibration suppression within broadband low-frequency bandgaps, stemming from the coupling between the designed secondary structures and host panels, are numerically and experimentally verified in both time and frequency domains. Equivalent mass-spring models are developed to theoretically predict the vibration attenuation ranges. Bandgap merging effects induced by the damping of the 3D printed meta-structures are further investigated, and remarkably enlarged attenuation bands are experimentally captured. The metamaterial-based lattice sandwich structures pave feasible ways for designing vibration shielding systems with both high functional and mechanical performance.
ISSN:1359-8368
1879-1069
DOI:10.1016/j.compositesb.2021.108772