In the present paper, we studyreflection of inclined incident plane waves from a free boundaryof the half-space in which the material is described byconstitutive equations valid for elastic solids with voids. Both the cases of the transverse and longitudinal incident waves are considered, and it is shown that onlythe transverse one can propagate in the solid without attenuation, after having been reflected from the free boundarysurface. The reflection coefficient and the amplitude of the surface oscillations are expressed in explicit form. The general results are demonstrated for several hypothetical porous materials, and it is shown that the reflection coefficient and the vibration amplitude are typically less than in classical media without voids. However, for relativelylarge transverse wave speed and high porosity, free boundary oscillation can exceed the classical one

REFLECTION OF PLANE WAVES BY THE FREE BOUNDARY OF A POROUS ELASTIC HALF-SPACE

CIARLETTA, Michele;
2003

Abstract

In the present paper, we studyreflection of inclined incident plane waves from a free boundaryof the half-space in which the material is described byconstitutive equations valid for elastic solids with voids. Both the cases of the transverse and longitudinal incident waves are considered, and it is shown that onlythe transverse one can propagate in the solid without attenuation, after having been reflected from the free boundarysurface. The reflection coefficient and the amplitude of the surface oscillations are expressed in explicit form. The general results are demonstrated for several hypothetical porous materials, and it is shown that the reflection coefficient and the vibration amplitude are typically less than in classical media without voids. However, for relativelylarge transverse wave speed and high porosity, free boundary oscillation can exceed the classical one
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/1062142
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