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. 2019 Dec 19;13(1):33. doi: 10.3390/ma13010033

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Inspection results by the visualization method of wave propagation on an aluminum plate with a crack: (a) Visualized results of ultrasonic waves; (b) Distribution of the maximum amplitude.