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the design of auxetic structure of seat skeleton . – Mechanics and Control, vol.31, pp.72-76. [13] Janus-Michalska M. (2009): Micromechanical model of auxetic cellular materials. – Journal of Theoretical and Applied Mechanics, 4, vol.47, pp.737-750. [14] Smardzewski J. and Jasińska D. (2017): Mathematical models and experimental data for HDF base sandwich panels with dual corrugated lighweight core. – Holzforschung, vol.71, No.3, pp.265-273.

. - Journal of Theoretical and Applied Mechanics (JTAM), 4, vol.47 pp.737-750. Janus-Michalska M. and Jasinska D. (2010): Contact problem for a class of anisotropic elastic cellular bodies with nonpositive Poisson’s ratio. - Technical Transactions, 4-B/2010/issue 19, year 107. Jasińska D. and Janus-Michalska M. (2008): Material design of anisotropic elastic cellular bodies with respect to contact problem - Engineering Transactions, vol.56, No.3, pp.201-225. Jasińska D., Janus-Michalska M. and Smardzewski J. (2012): A study on the design of auxetic structure of seat

foaming process by using multilayer orthogonal auxetic structure as reinforcement and polyurethane foam as matrix. The negative Poisson’s ratio (NPR) effect and mechanical behavior of the composite under a quasi-static compression were investigated and compared with those of the pure polyurethane foam and non-auxetic composite. The results obtained after the study show that the auxetic composite fabricated has an obvious NPR effect and behave more like a damping material with a large range of deformation strains [ 15 ]. Even though studies on auxetic composites exist in