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On the propagation of Lamb waves in viscothermoelastic plates under fluid loadings
Faculty
Science
Year:
2009
Type of Publication:
Article
Pages:
391-404
Authors:
Othman, Mohamed I. A, Sharma, J. N, Chand, Rattan
DOI:
10.1016/j.ijengsci.2008.10.008
Journal:
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE PERGAMON-ELSEVIER SCIENCE LTD
Volume:
47
Research Area:
Engineering
ISSN
ISI:000264261400006
Keywords :
Kelvin-Voigt model, Rayleigh-Lamb waves, Fluid loading, Thin plates
Abstract:
In this paper the propagation of plane and circular crested viscothermoelastic waves in a homogeneous isotropic, Kelvin-Voigt type viscoelastic thermally conducting, plate sandwiched between inviscid liquid layers is investigated in the context of classical and non-classical theories of thermoelasticity. The secular equations for the symmetric and skew-symmetric modes of plane and circular crested waves are derived in closed form and isolated mathematical conditions. It is noticed that the motion for both the plane and cylindrical waves in plates is governed by Rayleigh-Lamb-type secular equations. The secular equations for thin plate and short wave length waves are also obtained and discussed. The results in the absence of fluid loading, coupled and uncoupled theories of thermoelasticity have been obtained as particular cases from the derived secular equations. The dispersion curves, attenuation profiles and specific loss in case of symmetric and skew-symmetric wave modes are also presented graphically for a polymethyl methacrylate material plate under fluid loadings. The effect of dissipation due to viscosity is noticed to be quite significant and clearly visible from various curves in the graphs. (C) 2008 Elsevier Ltd. All rights reserved.
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