Prediction of auxetic phenomena in nanoporomaterials

Porous materials are efficient structures in respect to optimizing strength and stiffness for a given weight. A new means of improving the characteristics of the samples may be realized using abnormal deformation properties of auxetic porous materials having a negative Poisson's ratio v. Auxetic porous materials are suitable for creating adaptive contact joints and for replacing damaged biotissue. It is known that the inverted or re-entrant cell structure of porous auxetics may be obtained by isotropic permanent volumetric compression of conventional foam, resulting in microbukling of the cell walls. There is interest in compression-driven self-assembly as a means to create auxetic porous structures on a nanoscale. To predict the deformation behaviour of porous materials under various types of loading, corresponding mathematical models should be developed. The possibility of compression-driven self-assembly of the auxetic nanostructures has been predicted.