Elastic properties of a material composed of alternating layers of negative and positive Poisson's ratio

Hexagonal Honeycombs with Zero Poisson's Ratios and Enhanced Stiffness

“…accordance with the predictions made by Lim [26] and Kocer et al [27] for composites made from alternate layers of auxetic and conventional materials.…”

“…Once again, this finding that such honeycombs exhibit high values of the Young's moduli is of obvious considerable practical significance. [26,27] We also analyzed the extent of increase of the Young's modulus in the Ox 2 direction as a function of Dn 21 , the difference in the Poisson's ratio for loading in the Ox 2 direction between the fully conventional and the fully auxetic re-entrant honeycombs. As illustrated in Figure 8, we found that for any particular h/l combination, the extent of increase of the Young's modulus increases as the difference in the Poisson's ratio between the fully conventional and the fully auxetic re-entrant honeycombs increases.…”

Interactions of pectins with cellulose during its synthesis in the absence of calcium

“…Poisson's ratio was calculated as the ratio between the negative transverse strain and the longitudinal strain as result of the compression, according to its definition, and reflects the resistance of a material as it opposes volume and shape changes (Kocer, McKenzie, & Bilek, 2009). Poisson's ratio provides a universal way to contrast the structural performance of real materials, whether homogeneous or not, directly reflecting the compressibility of materials (Greaves, Greer, Lakes, & Rouxel, 2011;Wei & Lintilhac, 2007).…”

Maximizing the effective Young’s modulus of a composite material by exploiting the Poisson effect

“…Kocer et al. [44] further analyzed the properties of a layered composite with alternating negative and positive Poisson's ratios towards the thermodynamic limits. The resistance to mechanical deformation was observed to increase to a value higher than any of the two constituent materials.…”