Auxetics and Other Systems of Anomalous Characteristics

Auxetics and Other Systems of Anomalous Characteristics

“…crystal of hard spheres with an array of [001]-nanochannels filled by hard spheres of another diameter' by J. Narojczyk et al [20] The simulations show that symmetry of such crystals changes from the cubic to tetragonal one. When spheres inside the inclusions are smaller than spheres forming the crystalline matrix, the changes of Poisson's ratio are qualitatively similar to the changes observed earlier in the Yukawa sphere crystal, that is, the introduction of nanochannels causes simultaneous decrease of the Poisson's ratio for [110] [1][2][3][4][5][6][7][8][9][10]-directions, and its increase for [110][001]-directions. Filling the nanochannels with spheres having diameters greater than that of the spheres in the crystalline matrix, causes a strong decrease of the minimum Poisson's ratio value.…”

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The present volume on materials and models with negative Poisson's ratio (which are often referred to as "auxetics") and other systems of anomalous characteristics is the thirteenth focus issue of physica status solidi (b) on this subject. [1] The volume contains twenty papers grouped into three sections: macroscopic auxetic materials and models, microscopic models of auxetics, and other systems of anomalous characteristics.

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Elastic Wave Propagation of Two-Dimensional Metamaterials Composed of Auxetic Star-Shaped Honeycomb Structures

“…Then, the star-shaped honeycomb with varied Poisson ratio as presented by Meng et al [23] and the wave propagation behaviors and the band gaps were also analyzed in their studies. Wojciechowski et al [24] presented some investigations about the auxetics and other systems of anomalous characteristics. The abovementioned papers showed that the auxetic material with negative values of Poisson ratio have significant effects on the wave motion in elastic solid.…”