Propagation of longitudinal elastic waves in composites with a random set of spherical inclusions (effective field approach) |
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Authors: | S K Kanaun V M Levin |
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Institution: | (1) Instituto Tecnológico y de Estudios Superiores de Monterrey, CEM, Apdo Postal 6-3, Atizapan, Edo de México, México, 52926, México;(2) Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, México, México |
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Abstract: | The work is devoted to the problem of plane monochromatic longitudinal wave propagation through a homogeneous elastic medium
with a random set of spherical inclusions. The effective field method and quasicrystalline approximation are used for the
calculation of the phase velocity and attenuation factor of the mean (coherent) wave field in the composite. The hypotheses
of the method reduce the diffraction problem for many inclusions to a diffraction problem for one inclusion and, finally,
allow for the derivation of the dispersion equation for the wave vector of the mean wave field in the composite. This dispersion
equation serves for all frequencies of the incident field, properties and volume concentrations of inclusions. The long and
short wave asymptotics of the solution of the dispersion equation are found in closed analytical forms. Numerical solutions
of this equation are constructed in a wide region of frequencies of the incident field that covers long, middle, and short
wave regions of propagating waves. The phase velocities and attenuation factors of the mean wave field are calculated for
various elastic properties, density, and volume concentrations of the inclusions. Comparisons of the predictions of the method
with some experimental data are presented; possible errors of the method are indicated and discussed. |
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Keywords: | Elastic composites Homogenization problem Effective field method Mean wave field Phase velocity Attenuation factor Dispersion |
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