Surface Wave Propagation in Fiber Composite Laminates
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The use of surface acoustic waves to study surface and sub-surface defects is illustrated in the papers by Hsieh et al  and by Bashyan , contained in Volume IOB of the Review of Progress in QNDE. In the same volume, this present author  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.