A Baseline and Vision of Ultrasonic Guided Wave Inspection Potential

[+] Author and Article Information
Joseph L. Rose

Engineering Science & Mechanics Department, The Pennsylvania State University, University Park, PA 16802e-mail: jlresm@engr.psu.edu

J. Pressure Vessel Technol 124(3), 273-282 (Jul 26, 2002) (10 pages) doi:10.1115/1.1491272 History: Received April 03, 2002; Online July 26, 2002
Copyright © 2002 by ASME
Topics: Inspection , Waves
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Techniques for the generation of guided waves—(a) oblique incidence, (b) comb transducer
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Sample phase velocity spectra showing excitation amplitude versus phase velocity (frequency=4.3 MHz,bandwidth=.6 MHz)
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Experimental versus theoretical results for a traction-free aluminum plate (showing source influence)
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Sample power distribution and wave structure results taken for Ux in-plane displacement, and Wz, out-of-plane displacement from specific points on a dispersion curve: (a) f=0.293 MHz,Cp=4.48 km/s; (b) ff=0.664 MHz,Cp=4.85 km/s
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Lamb wave mode activation possibilities—(a) angle beam probe, (b) comb probe, (c), mode excitation zones. (Angle beam shoe-constant phase velocity (horizontal line) determined from Snell’s law for a given angle. Comb transducer excites modes with a constant wavelength (sloped line) determined by the spacing of the elements.)
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Nonaxisymmetric wave circumferential displacement distribution (circum. angle=180 deg,freq.=0.39 MHz, modes: L(0,1)−F(10,1), wall thickness=5/16 in.)
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A lap splice inspection sample problem—(a) ultrasonic through-transmission approach for lap splice joint inspection, (b) double spring “hopping probe” used for the inspection of a lap splice joint
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Reflection (a) and transmission (b) coefficients for n=0 mode under n=0 incident mode for 0.012 in. elliptical defect width (notch) and 10, 20,[[ellipsis]] 80% through-plate thickness depth




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