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null (Ed.)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.more » « less
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Hatamleh, Mohammad I. ; Barrios, Carlos A. ; Ren, Yao ; Zhang, Runyu ; Nambiar, Visakhan Vijayan ; Williams, Austin ; Shah, Pratik ; Guyan, Alan ; Lund, Benjamin ; Lu, Hongbing ; et al ( , MRS Communications)null (Ed.)