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

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 505; no. 1; pp. 111 - 115
• Main Authors: Kocer, C., McKenzie, D.R., Bilek, M.M.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15-04-2009; Elsevier
• Subjects: Condensed matter: structure, mechanical and thermal properties; Elasticity, elastic constants; Exact sciences and technology; Indentation; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Physics; Poisson's ratio; Strength; Young's modulus; Young's modulus; Poisson's ratio; Indentation; Strength; Mechanical strength; Elasticity; Young modulus; Finite element method; Lamellar structure; Composite materials; Poisson ratio; Auxetic material; Stiffness; Elasticity theory; Microstructure; Uniaxial load; Metamaterial
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2008.11.002

The theory of elasticity predicts a variety of phenomena associated with solids that possess a negative Poisson's ratio. The fabrication of metamaterials with a ‘
designed’ microstructure that exhibit a Poisson's ratio approaching the thermodynamic limits of 1/2 and −1 increases the likelihood of realising these phenomena for applications. In this work, we investigate the properties of a layered composite, with alternating layers of materials with negative and positive Poisson's ratio approaching the thermodynamic limits. Using the finite element method to simulate uniaxial loading and indentation of a free standing composite, we observed an increase in the resistance to mechanical deformation above the average value of the two materials. Even though the greatest increase in stiffness is gained as the thermodynamic limits are approached, a significant amount of added stiffness can be attained, provided that the Young's modulus of the negative Poisson's ratio material is not less than that of the positive Poisson's ratio material.