The Atkinson-Wilcox theorem in thermoelasticity
Authors:
Fioralba Cakoni and George Dassios
Journal:
Quart. Appl. Math. 57 (1999), 771-795
MSC:
Primary 74H45; Secondary 35Q72, 74F05, 74H10
DOI:
https://doi.org/10.1090/qam/1724305
MathSciNet review:
MR1724305
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Abstract: An incident disturbance propagates in a thermoelastic medium of the Biot type and it is scattered by a bounded discontinuity of the medium. On the surface of the scatterer any kind of boundary or transmission conditions, that secures well posedness, can hold. The scattered field consists of three kinds of displacement and two kinds of thermal waves. With the exception of one of the displacement waves, namely the transverse elastic wave, all other four scattered waves exhibit exponential attenuation as a result of the coupling between the longitudinal elastic and the thermal disturbances. We show that the displacement field can be expanded in three uniformly and absolutely convergent series in inverse powers of the distance between the observation point and the geometrical center of the scatterer. For the thermal wave a corresponding expansion with two series holds true. Each one of these three elastic and two thermal series describes the corresponding scattered wave and their validity is extended up to the sphere that circumscribes the scatterer. The leading coefficients in the two displacement series of the longitudinal type have only radial components which coincide with the corresponding radial scattering amplitudes. For the transverse displacement series the leading coefficient has only tangential components which coincide with the angular scattering amplitudes. An amazing result, which was not noticed before, is that the thermal scattering amplitudes, appearing as leading coefficients in the thermal expansions, are proportional to the corresponding radial longitudinal amplitudes of the elastic expansions. In other words, both scattering amplitudes of the two thermal waves carry no independent information about the scattering process. Finally, an analytic algorithm is provided which leads to the reconstruction of all five series from the knowledge of the three leading coefficients coming from the expansions for the displacement field alone. Consequently, if the radial and the tangential scattering amplitudes of the displacement field are given in the far field, then the exact displacement and thermal fields can be recovered all the way down to the smallest sphere containing the scatterer. In an equivalent component form we claim that the nine elastic and the two thermal expansions can be completely obtained once the two longitudinal and the two transverse elastic scattering amplitudes are given.
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F. V. Atkinson, On Sommerfeld’s radiation condition, Philos. Mag. Series 7, 40, 645–651 (1949)
M. Biot, Thermoelasticity and irreversible thermodynamics, J. Appl. Phys. 27, 240–253 (1956)
F. Cakoni and G. Dassios, The coated thermoelastic body within a low-frequency elastodynamic field, Internat. J. Engrg. Sci. 36, 1815–1838 (1998)
G. Dassios, The Atkinson-Wilcox expansion theorem for elastic waves, Quart. Appl. Math. 46, 285–299 (1988)
G. Dassios and V. Kostopoulos, The scattering amplitudes and cross sections in the theory of thermoelasticity, SIAM J. Appl. Math. 48, 79–98 (1988). Errata: SIAM J. Appl. Math. 49, 1283–1284 (1989)
G. Dassios and V. Kostopoulos, On Rayleigh expansions in thermoelastic scattering, SIAM J. Appl. Math. 50, 1300–1324 (1990)
G. Dassios and V. Kostopoulos, Thermoelastic Rayleigh scattering by a rigid ellipsoid, Mat. Aplic. Comput. 9, 153–173 (1990)
G. Dassios and V. Kostopoulos, Scattering of elastic waves by a small thermoelastic body, Internat. J. Engrg. Sci. 32, 1593–1603 (1994)
S. N. Karp, A convergent “farfield” expansion for two-dimensional radiation functions, Comm. Pure Appl. Math. 14, 427–434 (1961)
V. D. Kupradze, Three-dimensional Problems of the Mathematical Theory of Elasticity and Thermoelasticity, North-Holland, Amsterdam, 1979
J. C. Maxwell, Treatise on Electricity and Magnetism, 2 vols., third edition, Dover, New York, 1954.
A. Sommerfeld, Die Greensche Funktion der Schwingungsgleichung, Jahr. Der. Deut. Math. Ver. 21, 309–353 (1912)
V. Twersky, Rayleigh scattering, Applied Optics 3, 1150–1162 (1964)
C. H. Wilcox, A generalization of theorems of Rellich and Atkinson, Proc. Amer. Math. Soc. 7, 271–276 (1956)
C. H. Wilcox, An expansion theorem for electromagnetic fields, Comm. Pure Appl. Math. 9, 115–134 (1956)
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© Copyright 1999
American Mathematical Society