Authors

L. Sun; Y. Yu; G. B. Song;J. H. Gou

Comments

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Abbreviated Journal Title

J. Appl. Phys.

Keywords

THERMOPLASTIC COMPOSITES; NANOTUBE FILMS; DISPERSION; SCATTERING; Physics, Applied

Abstract

Polymer composites reinforced by carbon nanofibers (CNFs) in the form of paper sheet show significant vibration and acoustic damping improvement when compared to pure matrix materials. Without looking into the microscopic energy dissipation mechanisms, this paper analyzes the wave propagation in the composites from a macroscopic point of view. The CNF nanocomposites in this study were treated as stacking of alternating layers of pure polymer and CNF reinforced polymer. Analyses of acoustic wave propagation focused oil revealing the effects of acoustic impedance discontinuity at the interfaces of the layered structure. Plane wave transmission coefficient has been calculated as a function of the number of the layer repeats and thickness at different wave frequencies. Oscillations in the transmission coefficient have been observed when the acoustic wavelength is oil the same order of the bilayer thickness, indicating the possibility of designing the nanocomposite structure to optimize noise reduction characteristics. The numerical analysis converges with effective media theory when acoustic wavelength is much larger than the layer thickness.

Journal Title

Journal of Applied Physics

Volume

104

Issue/Number

4

Publication Date

1-1-2008

Document Type

Article

Language

English

First Page

5

WOS Identifier

WOS:000259265100035

ISSN

0021-8979

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