Theoretical Simulation of Experimental Observations of Surface Wave Propagation on a Fluid-Saturated Porous Material

摘要: Wave propagation in fluid-saturated porous materials presents very particular features like the appearance of a second compressional wave, so-called slow addition to conventional P (or fast compressional) and shear wave [1,2]. First experimental observation was carried out by Plona 1980 water-saturated ceramics at ultrasonic frequencies [3]. In 1983 Feng Johnson predicted existence new surface mode along fluid/fluid-saturated solid interface, well-known leaky-Rayleigh true Stoneley modes [4,5]. introduced stiffness, T, as parameter which describes boundary conditions interface. For value T=0 pores are considered open, whereas for T=∞ they be closed. However, according theory this appears only when closed prevail This last restriction renders problematic, because extreme difficult closing without clogging all close (e.g. painting). 1992 Nagy observed evidence [6]. demonstrated that capillary forces can extend an ideally thin membrane over interface between saturated with wetting fluid water or alcohol) non-wetting air). Under conditions, simple form during alcohol saturation sintered glass beads specimen obtained. due problems inherent excitation waves solids extremely high attenuation, small lengths, etc.) results were not conclusive. work we will show analytical method [5], if slight modifications into calculation technique order account some characteristics experiment.