Propagation of ultrasonic guided waves in lap-shear adhesive joints

Francesco Lanza di Scalea; Piervincenzo Rizzo; Alessandro Marzani

doi:10.1117/12.539982

21 July 2004 Propagation of ultrasonic guided waves in lap-shear adhesive joints

Francesco Lanza di Scalea, Piervincenzo Rizzo, Alessandro Marzani

Proceedings Volume 5394, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems III; (2004) https://doi.org/10.1117/12.539982
Event: NDE for Health Monitoring and Diagnostics, 2004, San Diego, CA, United States

Abstract

This paper deals with the propagation of ultrasonic guided waves in adhesively-bonded lap-shear joints. The topic is relevant to ultrasonic bond inspection in aerospace components. Specifically, the propagation of the lowest-order, antisymmetric a₀ mode through the joint is examined. This mode can be easily generated and detected in the field due to the predominant out-of-plane displacements at the surface of the test piece. An important aspect is the mode conversion at the boundaries between the single-plate adherends and the multilayer overlap. The a₀ strength of transmission is studied for three different bond states in aluminum joints, namely a fully cured adhesive bond, a poorly cured adhesive bond, and a slip bond. Theoretical predictions based on the Global Matrix Method indicate that the dispersive behavior of the guided waves in the multilayer overlap is highly dependent on bond state. Experimental tests of the joints are conducted by a hybrid, broadband laser/air-coupled ultrasonic setup in a through-transmission configuration. This system does not require any wet coupling and it can be moved flexibly across the test piece. The Gabor Wavelet transform is employed to extract energy transmission coefficients in the 100 kHz - 1.4 MHz range for the three different bond states examined. The cross-sectional mode shapes of the guided waves are shown to have a substantial role in the energy transfer through the joint. A rationale for the selection of the a₀ excitation frequencies highly sensitive to bond state will be given.

Citation Download Citation

Francesco Lanza di Scalea, Piervincenzo Rizzo, and Alessandro Marzani "Propagation of ultrasonic guided waves in lap-shear adhesive joints", Proc. SPIE 5394, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems III, (21 July 2004); https://doi.org/10.1117/12.539982

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