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An inequality for longitudinal and transverse wave attenuation coefficients
Ist Teil von
The Journal of the Acoustical Society of America, 2017-01, Vol.141 (1), p.475-479
Ort / Verlag
United States
Erscheinungsjahr
2017
Link zum Volltext
Quelle
AIP Journals Complete
Beschreibungen/Notizen
Total absorption, defined as the net flux of energy out of a bounded region averaged over one cycle for time harmonic motion, must be non-negative when there are no sources of energy within the region. This passivity condition places constraints on the non-dimensional absorption coefficients of longitudinal and transverse waves, γL
and γT
, in isotropic linearly viscoelastic materials. Typically, γL
, γT
are small, in which case the constraints imply that coefficients of attenuation per unit length, αL
, αT
, must satisfy the inequality
α
L
/
α
T
≥
4
c
T
3
/
3
c
L
3
where cL
, cT
are the wave speeds. This inequality, which as far as the author is aware, has not been presented before, provides a relative bound on wave speed in terms of attenuation, or vice versa. It also serves as a check on the consistency of ultrasonic measurements from the literature, with most but not all of the data considered passing the positive absorption test.
Sprache
Englisch
Identifikatoren
ISSN: 0001-4966
eISSN: 1520-8524
DOI: 10.1121/1.4974152
Titel-ID: cdi_scitation_primary_10_1121_1_4974152
Format
–
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