Predicted Far Field Response of Quasi-Isotropic Laminates to Internal Impulsive Events
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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
The near field dynamic response of a quasi-isotropic laminate to a number of impulsive internal line sources has been considered in the companion paper [1]. That paper deals with three different line dislocation sources located at each of the seven ply interfaces in turn and shows the time histories of the top surface normal displacement at a distance of one plate thickness from the vertical plane containing the line of action of the source. In this paper attention is focussed on the far field disturbances arising from a line dislocation in the form of a step function in time and corresponding to a crack opening displacement discontinuity acting at each of the seven interfaces in turn. The time history of the normal displacement at the upper surface is presented for receivers located at a distance of 20 plate thicknesses from the plane of action of the sources.