Reflection of Ultrasonic Waves by Flaws in Thick Composites
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
A layer of a fiber reinforced composite consists of many plies. For wavelengths of the same order of magnitude as the ply thicknesses, but still much larger than the fiber diameters, the ply interfaces will act as surfaces of reflection and transmission. A thick layer of a fiber-reinforced composite may then be expected to display many of the features of a solid with periodic structuring. For through-the-thickness propagation of time-harmonic mechanical disturbances, these features include passing and stopping bands.