Abstract
T he propagation of longitudinal elastic waves along cylindrical shells can be treated in terms of the exact three-dimensional elastic theory. When the thickness of the shell is very small compared with its radius r, the shell might be expected to behave like a flat plate for wavelengths small compared with r. In this paper it is shown theoretically and verified experimentally that this is so, and that both symmetrical and antisymmetrical plate waves can be propagated. The experimental part of the paper is concerned with the signal velocity of a mechanical pulse travelling in a thin-walled steel tube, and it is found that those Fourier components which travel with the symmetrical plate wave velocity appear at the head of the pulse as it propagates down the tube.
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