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Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Advanced Materials 2018
September 04-06, 2018
September 04-06, 2018 | Zürich, Switzerland
21
st
International Conference on
Advanced Materials & Nanotechnology
Designing anisotropic metamaterials with wave propagation isolation properties
N Karathanasopoulos
1
, H Reda
2
and
J F Ganghoffer
3
1
Institute of Computational Science, Switzerland
2
Lebanese University, Lebanon
3
University of Lorraine France
T
he advancement of additive manufacturing has led to a new paradigm in the design of materials. New artificial materials
arose, not through chemically modifiedmaterial units but rather through appropriately coined inner material architectures.
The wording metamaterials has been employed to designate the potential of creating static and dynamic behaviors which are
typically not encountered in common engineering materials. Up to now a considerable amount of works have been dedicated
to a class of metamaterials named auxetics, because of their property of laterally expand when stretched. In the current work,
we present a systematic approach to create two-dimensional orthotropic metamaterials with a non auxetic material behavior
that exhibit wave propagation isolation features. To that scope, we employ polygonal-shaped unit cell material architectures
that lead to highly anisotropic material designs in a systematic manner. We compute the anisotropic metamaterial’s wave
propagation characteristics for all propagating material directions. Thereupon, we identify a material direction of vanishing
longitudinal and shear phase velocities. We observe that the vanishing phase velocity direction coincides with the material
direction with the weakest normal mechanical modulus. We discuss on the role of Poisson’s ratio and shear stiffness obtained
by wave propagation features, deriving overall conclusions on the underlying structural mechanisms.
nkaratha@ethz.chRes. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C3-021