Continuous and discrete microstructured materials with null Poisson's ratio

In this paper we propose different classes of isotropic microstructured media with tunable Poisson's ratio. The elastic periodic systems are continuous porous media and two- and three-dimensional lattices. The microstructural parameters can be tuned in order to have an effective Poisson's ratio equal to zero. The connection between microstructural parameters and effective properties is shown in detail both analytically and numerically.

Continuous system with null Poisson's ratio:

<img src=http://s725.photobucket.com/user/giorgio_carta/media/Figure1_zpsux77ig9p...">

Discrete system with null Poisson's ratio:

<img src=http://s725.photobucket.com/user/giorgio_carta/media/Figure2_zpsshdy2ukl...">