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Vaziri's Research Featured in Scientific Reports

December 21, 2015

MIE Associate Professor Ashkan Vaziri's research on "Hierarchical Honeycomb Auxetic Metamaterials" was published in Scientific Reports. His co-authors include MIE PhD students Davood Mousanezhad, Hamid Ebrahimi, and Associate Research Scientist Ranajay Ghosh.

Abstract Source: Scientific Reports

Most conventional materials expand in transverse directions when they are compressed uniaxially resulting in the familiar positive Poisson’s ratio. Here we develop a new class of two dimensional (2D) metamaterials with negative Poisson’s ratio that contract in transverse directions under uniaxial compressive loads leading to auxeticity. This is achieved through mechanical instabilities (i.e., buckling) introduced by structural hierarchy and retained over a wide range of applied compression. This unusual behavior is demonstrated experimentally and analyzed computationally. The work provides new insights into the role of structural organization and hierarchy in designing 2D auxetic metamaterials, and new opportunities for developing energy absorbing materials, tunable membrane filters, and acoustic dampeners.