Attenuation and dispersion of SH-waves in a loosely bonded sandwiched fluid saturated porous layer

The present paper deals with SH-wave propagation in an upper heterogeneous fiber-reinforced layer overlying a loosely bonded heterogeneous porous layer and an initially stressed viscoelastic half-space. Dispersion relations are derived when the ratio of heterogeneity parameter associated with rigidity to that of density of the sandwiched layer is equal to zero, one and greater than one. The real and imaginary part of the dispersion equation correspond to the dispersion and attenuation curves respectively. The effect of presence and absence of heterogeneity, loose bonding, internal friction, width ratio and initial stress on the dispersion curve as well as attenuation curve is studied extensively. The effect of heterogeneity associated to the sandwiched fluid saturated porous layer on the propagation of SH-wave is among the major highlights of the study.