Beam-to-Mode Conversion in an Aluminum Plate for Ultrasonic NDE Applications

[+] Author and Article Information
I. T. Lu, L. B. Felsen

Department of Electrical Engineering and Computer Science, Polytechnic University, Farmingdale, N.Y. 11735

J. M. Klosner

Department of Mechanical and Industrial Engineering, Polytechnic University, Farmingdale, N.Y. 11735

J. Eng. Mater. Technol 112(2), 236-240 (Apr 01, 1990) (5 pages) doi:10.1115/1.2903314 History: Received March 19, 1989; Online April 29, 2008


In a multilayer elastic plate, weak debonding in the horizontal direction parallel to the plate boundaries is insensitive to ultrasonic compressional (P) waves impinging perpendicularly, and can therefore not be detected by conventional vertically oriented reflection schemes. One of the methods for generating along the flaw line shearing stresses, to which the flaw responds, is to orient the input beam obliquely. Unlike vertically impinging beams, multiply reflected oblique beams eventually are converted into guided modes. The horizontal ranges over which the field in the unflawed plate is beam-like or mode-like must be well understood for selection of a diagnostic NDE scheme with “good” features for detection and identification. The present analytical model study explores the conversion and P-SV coupling processes for an oblique Gaussian P beam input in an aluminum plate. Special attention is given to physical features in the computed data that are relevant for “good” NDE algorithm construction.

Copyright © 1990 by The American Society of Mechanical Engineers
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