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Open AccessArticle

Auxeticity of Concentric Auxetic-Conventional Foam Rods with High Modulus Interface Adhesive

School of Science and Technology, Singapore University of Social Sciences, Singapore 599494, Singapore
Materials 2018, 11(2), 223; https://doi.org/10.3390/ma11020223
Received: 11 December 2017 / Revised: 19 January 2018 / Accepted: 31 January 2018 / Published: 31 January 2018
(This article belongs to the Special Issue Auxetic Materials 2017-2018)
While the rule of mixture is applicable for addressing the overall Poisson’s ratio of a concentrically aligned bi-layered rod under longitudinal loading, the same cannot be said for this rod under torsional loading due to the higher extent of deformation in the rod material further away from the torsional axis. In addition, the use of adhesives for attaching the solid inner rod to the hollow outer rod introduces an intermediate layer, thereby resulting in a tri-layered concentric rod if the adhesive layer is uniformly distributed. This paper investigates the effect of the adhesive properties on the overall auxeticity of a rod consisting of two concentrically aligned cylindrical isotropic foams with Poisson’s ratio of opposite signs under torsional loads. An indirect way for obtaining Poisson’s ratio of a concentrically tri-layered rod was obtained using a mechanics of materials approach. Results show that the auxeticity of such rods is influenced by the adhesive’s stiffness, Poisson’s ratio, thickness, and radius from the torsional axis. View Full-Text
Keywords: adhesive; auxetic; concentric cylinders; foam; torsion; tri-layered adhesive; auxetic; concentric cylinders; foam; torsion; tri-layered
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Lim, T.-C. Auxeticity of Concentric Auxetic-Conventional Foam Rods with High Modulus Interface Adhesive. Materials 2018, 11, 223.

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