Negative Poisson S Ratio Auxetic Materials Youtube Auxetic metamaterials are a type of metamaterial with a negative poisson's ratio, so that axial elongation causes transversal elongation (in contrast to an ordinary material, where stretching in one direction causes compression in the other direction). auxetics can be single molecules, crystals, or a particular structure of macroscopic matter. Poisson's ratios of any value within the thermodynamically admissible domain may be attained, including negative poisson's ratio (termed auxetic). in this article, we discuss the role of poisson's ratio in elasticity, two dimensional and three dimensional materials, phase transformations, underlying causes in the microstructure, and other negative physical properties.
Auxetic Negative Poisson S Ratio Structure Youtube The poisson’s ratio (ν) is the physical property used to quantify the phenomena, which is a positive value for most cases. however, for some special materials (the so called auxetic materials. In a book published in 1944, love described a material with negative poisson’s ratio [1]. according to the knowledge of the author, that is the first engineering mechanics fact finding recorded, although materials with either negative or zero poisson’s ratio may have been known to exist more than a 100 years ago. Due to the negative poisson's ratio, auxetic materials have enhanced mechanical properties (tab. 1) [27 38], most of which are superior to similar properties of non auxetic materials, and some of them. Lakes, r. s., "negative poisson's ratio materials: auxetic solids", annual review of materials research, 47: 63 81 july (2017). poisson's ratio had long been considered to be an intrinsic material property, confined within a narrow domain and governed solely by the geometry of interatomic bonds.
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