23 March 2015 Enhanced nonlinear crack-wave interactions for structural damage detection based on Lamb waves
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Abstract
The paper presents a novel damage detection method that combines Lamb wave propagation with nonlinear acoustics. Low-frequency excitation is used to modulate Lamb waves in the presence of fatigue cracks. The work presented shows that the synchronization of the interrogating high-frequency Lamb wave with the low-frequency vibration is a key element of the proposed method. The main advantages of the proposed method are the lack of necessity for baseline measurements representing undamaged condition and lack of sensitivity to temperature variations. Numerical simulations and experimental measurements are performed to demonstrate the application of the proposed method to detect fatigue crack in aluminum beam.
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Kajetan Dziedziech, Lukasz Pieczonka, Piotr Kijanka, Wieslaw J. Staszewski, "Enhanced nonlinear crack-wave interactions for structural damage detection based on Lamb waves", Proc. SPIE 9438, Health Monitoring of Structural and Biological Systems 2015, 94380C (23 March 2015); doi: 10.1117/12.2084064; https://doi.org/10.1117/12.2084064
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