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Elastic measurements on macroscopic three-dimensional pentamode metamaterials

Elastic measurements on macroscopic three-dimensional pentamode metamaterials
Author: R. Schittny, T. Bückmann, M. Kadic, and M. Wegener links:
Source: Appl. Phys. Lett. 103, 231905 (2013)
Date: 3.12.2013

 

Abstract:

Pentamode metamaterials approximate tailorable artificial liquids. Recently, microscopic versions of these intricate three-dimensional structures have been fabricated, but direct experimental characterization has not been possible yet. Here, using three-dimensional printing, we fabricate macroscopic polymer-based samples with many different combinations of the small connection diameter d and the lattice constant a. Direct measurements of the static shear modulus and the Young's modulus reveal that both scale approximately according to (d/a)3, in good agreement with continuum-mechanics calculations. For the smallest accessible values of d/aā‰ˆ1.5%, we find derived ratios of bulk modulus B to shear modulus G of B/Gā‰ˆ1000.