18 June 2002 Guided-wave ultrasonics for NDE of aging aircraft components
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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.
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Francesco Lanza di Scalea, Francesco Lanza di Scalea, Joshua S. Robinson, Joshua S. Robinson, Daniel Tuzzeo, Daniel Tuzzeo, Massimo Bonomo, Massimo Bonomo, } "Guided-wave ultrasonics for NDE of aging aircraft components", Proc. SPIE 4704, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Civil Infrastructures, (18 June 2002); doi: 10.1117/12.470717; https://doi.org/10.1117/12.470717
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