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Proceedings Paper

Ultrasonic Lamb wave tomographic scanning
Author(s): Mark K. Hinders; Eugene V. Malyarenko; James C.P. McKeon
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Paper Abstract

Lamb waves are guided ultrasonic waves capable of propagating relatively long distances in plate-like structures such as airframe skins. Their propagation depends on frequency-thickness and material properties, and because structural flaws present changes in effective thickness and/or material properties Lamb waves can be employed to assess the integrity of these structures. For aging aircraft structures a full integrity evaluation can be a time- consuming operation, but with Lamb wave techniques this evaluation can be performed with waves propagating along one dimension of the inspection area as the probing transducer pair is moved in the perpendicular dimension. Such an approach yields information about the presence of flaws within the scanned area. Then, in order to quantitatively characterize the flaws, Lamb wave measurements can be made for a number of projections and an image of the flawed region can be reconstructed tomographically. In this paper, contact scanning Lamb wave tomography for metallic aircraft structures with flaws is discussed as a practical technique for quantitative nondestructive evaluation.

Paper Details

Date Published: 28 January 1999
PDF: 13 pages
Proc. SPIE 3586, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware III, (28 January 1999); doi: 10.1117/12.339896
Show Author Affiliations
Mark K. Hinders, College of William and Mary (United States)
Eugene V. Malyarenko, College of William and Mary (United States)
James C.P. McKeon, Sonix, Inc. (United States)


Published in SPIE Proceedings Vol. 3586:
Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware III
Ajit K. Mal, Editor(s)

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