Effect of a Damping Layer on Harmonic Wave Motion in a Laminated Plate
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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
This paper is concerned with investigating the difference in response between a three-ply elastic plate of infinite lateral extent and a similar plate in which the core elastic layer is replaced by a layer of viscoelastic damping material. The transient response of the plate to an impulsive loading is governed by the dispersion equations for infinite trains of harmonic waves propagating under traction free conditions on the plate surfaces (see e.g. Achenbach [1]). These dispersion equations express the wavelength and the damping factor as functions of the frequency and they possess an infinite set of roots, corresponding to different modes of wave motion. In addition to their relevance to the impulsive loading problem, the dispersion curves of the various modes, have a significance for the experimental determination of the properties of laminates by ultrasonic techniques (see e.g. Mal and Bar Cohen [2]).