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.
Recommended Citation
S. Malakooti and M. I. Hatamleh and R. Zhang and T. Taghvaee and M. Miller and Y. Ren and N. Xiang and D. Qian and C. Sotiriou-Leventis and N. Leventis and H. Lu, "Metamaterial-Like Aerogels for Broadband Vibration Mitigation," Soft Matter, vol. 17, no. 17, pp. 4496 - 4503, Royal Society of Chemistry, May 2021.
The definitive version is available at https://doi.org/10.1039/d1sm00074h
Department(s)
Chemistry
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
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