Surface Wave Propagation in Fiber Composite Laminates

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1992
Authors
Green, W. Anthony
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Abstract

The use of surface acoustic waves to study surface and sub-surface defects is illustrated in the papers by Hsieh et al [1] and by Bashyan [2], contained in Volume IOB of the Review of Progress in QNDE. In the same volume, this present author [3] shows that for multi-layered fiber composite laminates, the existence of surface waves is in some cases associated with the short wavelength behaviour of the fundamental mode of the dispersion equation and in other cases it is associated with the higher harmonics. In the latter event, surface wave propagation occurs only over a restricted range of wavelengths or frequency for each harmonic and in this paper we examine the conditions which determine the extent of this range.

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