Abstract
The paper discusses experimental verification of a damage detection method based on nonlinear crack-wave interactions in aluminum beam with fatigue crack. The method under consideration is based on a low-frequency vibration excitation, used to perturb damage, combined with high-frequency interrogating waves, used to detect damage-related nonlinearities. The proposed method can detect and localize both damage-related and intrinsic nonlinearities, allowing for reliable damage detection. The method does not require baseline measurements representing an undamaged condition and it is not sensitive to temperature variations. Damage localization is obtained through proper synchronization of the low-frequency vibration with the interrogating high-frequency wave packets. This paper aims at experimental verification of the opening–closing action of a fatigue crack being the source of nonlinearity in the analyzed case. A developed vision system composed of a high-speed digital camera with microscopic optics and vision-based tracking algorithms is used to analyze crack motion during the experiment. Quantitative analysis of the crack opening–closing action is performed to better understand the process of nonlinear wave modulations.
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Acknowledgements
This work has been supported by the AGH University, WIMiR, research grant no. 15.11.130.423.
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Pieczonka, Ł., Kohut, P., Dziedziech, K., Uhl, T., Staszewski, W.J. (2018). Experimental Investigation of Crack-Wave Interactions for Structural Damage Detection. In: Timofiejczuk, A., Łazarz, B.E., Chaari, F., Burdzik, R. (eds) Advances in Technical Diagnostics. ICTD 2016. Applied Condition Monitoring, vol 10. Springer, Cham. https://doi.org/10.1007/978-3-319-62042-8_10
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DOI: https://doi.org/10.1007/978-3-319-62042-8_10
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