Vibroacoustics and damping analysis of negative Poisson's ratio honeycombs

Fabrizio L. Scarpa; Geoffrey R. Tomlinson

doi:10.1117/12.310695

16 June 1998 Vibroacoustics and damping analysis of negative Poisson's ratio honeycombs

Fabrizio L. Scarpa, Geoffrey R. Tomlinson

Proceedings Volume 3327, Smart Structures and Materials 1998: Passive Damping and Isolation; (1998) https://doi.org/10.1117/12.310695
Event: 5th Annual International Symposium on Smart Structures and Materials, 1998, San Diego, CA, United States

Abstract

In this paper a novel class of core material for sandwich structures is analyzed from an analytical and numerical point of view. Honeycombs with re-entrant cell geometry present negative in-plane Poisson's ratio coefficients, with an increase of bending stiffness compared to the one of hexagonal honeycomb cores. Due to the orthotropic mechanical properties of this kind of core material it is possible to employ the formulations of laminated orthotropic plates in order to describe the vibroacoustic behavior of simply supported sandwich plates. The natural frequencies of these laminates are sensitive to the geometrical parameters of the core cells. As an example application, an infinite cylindrical sandwich shell in contact with exterior and interior fluid flow is examined. An improvement of transmission loss factors is observed, suggesting a possible use of these cores in acoustic insulation. Damping properties are modeled taking into account the complex modulus of the core material. Two models are examined, one with full viscoelastic core and the other with a free-layer symmetrical beam geometry in order to describe the walls of the core cells. Both cases show a significant increase of the storage moduli of the cores compared to the ones of a regular honeycomb.

Citation Download Citation

Fabrizio L. Scarpa and Geoffrey R. Tomlinson "Vibroacoustics and damping analysis of negative Poisson's ratio honeycombs", Proc. SPIE 3327, Smart Structures and Materials 1998: Passive Damping and Isolation, (16 June 1998); https://doi.org/10.1117/12.310695

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