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Proceedings Paper

Mechanical metamaterials: recent advances and opportunities for NDE and nonlinear acoustics (Conference Presentation)
Author(s): Eduard Karpov; Larry Danso; John Klein

Paper Abstract

Mechanical metamaterials represent a novel interesting class or structural composites that manifest behaviors beyond the scope of traditional materials mechanics. Those include negative elastic moduli and basic symmetries breaking, such as reciprocity of mechanical deformation. The ongoing research aims to understand relationships between a desired property, which often corresponds to an exotic domain in the overall design space, and the material’s internal structure. Some of the recent studies use multistabilities at the unit cell level to deploy a load-induced polymorphic phase transformation in an entire material sample. When properly designed, this phase transformation can lead to a contraction of the material sample in the direction of an increasing load, a manifest of the negative extensibility phenomenon. Other studies suggest that properly designed highly nonlocal periodic lattices can provide metamaterials with anomalous spectral properties leading to reversal of the Saint-Venant edge effect. In this presentation, we overview recent developments in the analysis and design of these interesting material systems, and outline their opportunities for nonlinear acoustics and structural health monitoring.

Paper Details

Date Published: 17 September 2018
Proc. SPIE 10719, Metamaterials, Metadevices, and Metasystems 2018, 107192S (17 September 2018); doi: 10.1117/12.2320271
Show Author Affiliations
Eduard Karpov, Univ. of Illinois at Chicago (United States)
Larry Danso, Univ. of Illinois at Chicago (United States)
John Klein, Univ. of Illinois at Chicago (United States)

Published in SPIE Proceedings Vol. 10719:
Metamaterials, Metadevices, and Metasystems 2018
Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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