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. 2018 Sep 1;11(9):1574. doi: 10.3390/ma11091574

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Displacement contours of metamaterials corresponding to various PR values: (a) $ν = - 0.3$ ; (b) $ν = - 0.6$ ; (c) $ν = - 1.0$ ; (d) $ν = + 0.3$ ; (e) $ν = + 0.6$ ; (f) $ν = + 1.0$ .