In periodic two-layer media the effective mass density depends on the shear modulus, transitioning from the isotropic elastic arithmetic average to the anisotropic acoustic values (arithmetic normal, harmonic parallel) once band-gap intervals are excluded.
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Effective mass density for wave propagation in periodic layered media in the elasto-acoustic transition
In periodic two-layer media the effective mass density depends on the shear modulus, transitioning from the isotropic elastic arithmetic average to the anisotropic acoustic values (arithmetic normal, harmonic parallel) once band-gap intervals are excluded.