Metamaterial-like aerogels for broadband vibration mitigation. Issue 17 (26th March 2021)

• Record Type: Journal Article
• Authors: Malakooti, Sadeq; Hatamleh, Mohammad I.; Zhang, Rui; Taghvaee, Tahereh; Miller, Max; Ren, Yao; Xiang, Ning; Qian, Dong; Sotiriou-Leventis, Chariklia; Leventis, Nicholas; Lu, Hongbing
• Is Part Of: Soft matter. Volume 17:Issue 17(2021)
• Page Start: 4496
• Page End: 4503
• Publication Date: 2021-03-26
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/d1sm00074h
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : We present metamaterial-like aerogels that provide broadband low-frequency vibration mitigation through their self-assembled locally resonant microstructures. Simulations confirm the presence of a negative dynamic stiffness for the aerogels. 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.