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Anomalous Absorption of Bulk Shear Sagittal Acoustic Waves in a Layered Structure With Viscous Fluid
Gramotnev, Dmitri K., Mather, Melissa L. and Nieminen, Timo A. (2003-05-01) Anomalous Absorption of Bulk Shear Sagittal Acoustic Waves in a Layered Structure With Viscous Fluid. Ultrasonics, 41 3: 197-205.
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paper.pdf
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paper.pdf |
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| Author(s) |
Gramotnev, Dmitri K.
Mather, Melissa L.
Nieminen, Timo A.
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| Title |
Anomalous Absorption of Bulk Shear Sagittal Acoustic Waves in a Layered Structure With Viscous Fluid
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| Journal name |
Ultrasonics
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| Publication date |
2003-05-01
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| Volume number |
41
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| Issue number |
3
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| ISSN |
0041-624X
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| Start page |
197
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| End page |
205
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| Total pages |
9
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| Place of publication |
Amsterdam
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| Publisher |
Elsevier Science
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| Subject |
240501 Acoustics and Acoustical Devices; Waves
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| Abstract |
It is demonstrated theoretically that the absorptivity of bulk shear sagittal waves by an ultra-thin layer of viscous fluid between two different elastic media has a strong maximum (in some cases as good as 100%) at an optimal layer thickness. This thickness is usually much smaller than the penetration depths and lengths of transverse and longitudinal waves in the fluid. The angular dependencies of the absorptivity are demonstrated to have significant and unusual structure near critical angles of incidence. The effect of non-Newtonian properties and non-uniformities of the fluid layer on the absorptivity is also investigated. In particular, it is shown that the absorption in a thin layer of viscous fluid is much more sensitive to non-zero relaxation time(s) in the fluid layer than the absorption at an isolated solid-fluid interface.
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| Keyword(s) |
absorptivity
absorption
viscous fluid
acoustic waves
bulk waves
viscoelastic layers
frictional contacts
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| Additional Notes |
Originally published as Dmitri K. Gramotnev, Melissa L. Mather and Timo A. Nieminen (2003) Anomalous absorption of bulk shear sagittal acoustic waves in a layered structure with viscous fluid, Ultrasonics, 41 (3) : 197-205. Copyright 2003 Elsevier. All rights reserved.
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