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Proceedings Paper

Guided-wave ultrasonics for NDE of aging aircraft components
Author(s): Francesco Lanza di Scalea; Joshua S. Robinson; Daniel Tuzzeo; Massimo Bonomo
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Paper Abstract

Bond inspection is one of the most critical NDE tasks addressing the aging aircraft problem. This paper is aimed at reviewing and furthering the use of ultrasonic guided waves for the inspection of bonded components, particularly lap joints between thin plates such as those found in aircraft skins. The transfer matrix theory of wave propagation in multilayered components is used to predict the sensitivity of the wave dispersion behavior to the bond state. The experimental study includes the use of non- contact air-coupled transducers to excite and detect guided waves in a pitch-catch arrangement. It is shown that by monitoring the ultrasound amplitude leaking through the bondline it is possible to detect disbonds as well as low- strength bonds. A photoelastic study confirms this result. It is reaffirmed that those modes with predominant shear- type deformations at the bondline are the most sensitive to the bond state.

Paper Details

Date Published: 18 June 2002
PDF: 10 pages
Proc. SPIE 4704, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Civil Infrastructures, (18 June 2002); doi: 10.1117/12.470717
Show Author Affiliations
Francesco Lanza di Scalea, Univ. of California/San Diego (United States)
Joshua S. Robinson, Univ. of California/San Diego (United States)
Daniel Tuzzeo, Univ. of California/San Diego (Italy)
Massimo Bonomo, Univ. of California/San Diego (Italy)

Published in SPIE Proceedings Vol. 4704:
Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Civil Infrastructures
Andrew L. Gyekenyesi; Steven M. Shepard; Dryver R. Huston; A. Emin Aktan; Peter J. Shull, Editor(s)

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