Metamaterial-Like Aerogels for Broadband Vibration Mitigation
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.
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
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07 May 2021