ASA 128th Meeting - Austin, Texas - 1994 Nov 28 .. Dec 02

2aSA14. Scholte interface wave on a cylindrical shell.

G. Maze

F. Leon

F. Lecroq

D. Decultot

LAUE, URA 1373 of the CNRS, Univ. of Le Havre, 76610 Le Havre, France

H. Uberall

Univ. of Le Havre, France

Catholic Univ., Washington, DC 20064

The fluid-borne interface wave on an evacuated cylindrical shell immersed in water is known as Scholte--Stoneley wave, or also as A wave [Talmant et al., J. Acoust. Soc. Am. 86, 278 (1989)]. The resonances of this wave, caused by phase matching upon its multiple circumnavigations of the scattering object, can be observed in the backscattering spectra of incident sound waves within a frequency window that depends on the shell thickness, for thicknesses less than 40% of the cylinder radius. The interaction between the flexural wave A[sub 0] in the shell, and the Scholte wave is studied in detail as a function of shell thickness. Dispersion curves for the A and the A[sub 0] waves are presented, indicating a region of repulsion between these two curves corresponding to a change of the physical nature of the two waves.