Abstract
In the following chapter, two types of dissipative multi-resonator elastic metamaterials are considered for the broadband attenuation/mitigation of elastic waves. The first microstructural design consists of a triatomic mass-in-mass lattice where the influence of the internal damping amplitudes on broadband energy absorption is examined. The second metamaterial design considered is constructed from a sandwich beam containing multiple dissipative interior resonators. By utilizing the locally resonant motions of the internal resonant structures and intrinsic damping/viscoelastic properties of the metamaterial microstructure, broadband energy absorption can be clearly demonstrated for both microstructural designs. The underlying attenuation mechanisms in both designs are a negative effective mass and an effective metadamping coefficient that occur near the local resonant frequencies of the internal resonant masses. Based on these two working mechanisms, it is numerically demonstrated that the two metamaterial designs can strongly mitigate elastic waves over extremely broad frequency ranges at subwavelength scale. These elastic metamaterial designs have a wide range of potential applications including the suppression of blast or shock waves capable of severely damaging nearby structures.
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Acknowledgements
This work was supported by the Air Force Office of Scientific Research under No. AF 9550-15-1-0061 with Program Manager Dr. Byung-Lip (Les) Lee.
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Chen, H., Barnhart, M.V., Chen, Y.Y., Huang, G.L. (2018). Elastic Metamaterials for Blast Wave Impact Mitigation. In: Gopalakrishnan, S., Rajapakse, Y. (eds) Blast Mitigation Strategies in Marine Composite and Sandwich Structures. Springer Transactions in Civil and Environmental Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-10-7170-6_19
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