Abstract
Theoretical calculations have shown that the high-frequency scattering from a thin spherical shell is dominated by a single peak that occurs near the opening of the first symmetric Lamb wave. This peak is associated with a region of strong negative group velocity surrounding the opening of the first symmetric Lamb wave. Experimental verification of the existence of the thickness quasiresonance on a 2% stainless steel shell is given. In addition an analysis of the thickness quasiresonance in the complex-ka plane is presented for shells of different material parameters. It is shown that the thickness quasiresonance bifurcates as a function of Poisson’s ratio in such a manner that the region of negative group velocity remains close to the opening of the first symmetric Lamb wave. [Work supported by ONR.]
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