Localization of Ultrasound in Thick Composites
The propagation of ultrasound in fiber-reinforced composites is controlled by the relative magnitudes of characteristic length variables. These length variables are the wavelength (Λ), the fiber diameter (a), the thicknesses of plies (h), and the overall thickness of the component (H). It may generally be assumed that Λ is much larger than the fiber diameter (a ~ 8 µm). On the other hand wavelengths of the order of thicknesses of plies (h ~ 100 µm), but smaller than the overall thickness of the component may well occur. In that range of wavelengths the propagation of ultrasonic waves gives rise to interesting multiple reflection phenomena which are the topic of this paper.
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