Title

Metamaterial-Like Aerogels for Broadband Vibration Mitigation

Abstract

We report a mechanical metamaterial-like behavior as a function of the micro/nanostructure of otherwise chemically identical aliphatic polyurea aerogels. Transmissibility varies dramatically with frequency in these aerogels. Broadband vibration mitigation is provided at low frequencies (500-1000 Hz) through self-assembly of locally resonant metastructures wherein polyurea microspheres are embedded in a polyurea web-like network. A micromechanical constitutive model based on a discrete element method is established to explain the vibration mitigation mechanism. Simulations confirm the metamaterial-like behavior with a negative dynamic material stiffness for the micro-metastructured aerogels in a much wider frequency range than the majority of previously reported locally resonant metamaterials.

Department(s)

Chemistry

Comments

The authors thank the NSF under award numbers CMMI-1661246, CMMI-1636306, CMMI-1726435, CMMI-1727960 and CMMI-1530603 (sub-contract to MS&T from Tufts University), Sandia National Laboratories grant (220202), the Army Research Office (W911NF-14-1-0369) for financial support, and Covestro LLC (formerly Bayer Corporation USA) for the generous supply of Desmodur N3300

International Standard Serial Number (ISSN)

1744-683X; 1744-6848

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2021 Royal Society of Chemistry, All rights reserved.

Publication Date

07 May 2021

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