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Metals 2016, 6(11), 266;

Acoustic Emission Assessment of Impending Fracture in a Cyclically Loading Structural Steel

Institute of Advanced Tecnologies, Togliatti State University, Russian Federation, Belorusskaya str. 14, Togliatti 445667, Russia
Department of Management and Engineering, University of Padova, Vicenza, S. Nicola 3, Stradella 36100, Italy
Department of Engineering Design and Materials, Norwegian University of Science and Technology—NTNU, Trondheim N-7491, Norway
Author to whom correspondence should be addressed.
Academic Editors: João Manuel R. S. Tavares and Victor Hugo C. de Albuquerque
Received: 29 September 2016 / Revised: 20 October 2016 / Accepted: 24 October 2016 / Published: 4 November 2016
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Using the advanced acoustic emission (AE) technique, we address the problem of early identification of crack initiation and growth in ductile structural steels under cyclic loading. The notched 9MnSi5 steel specimens with weld joints were fatigue tested at room and lower temperatures with concurrent AE measurements. Detection of AE in ductile materials where fatigue crack initiation and propagation is mediated by local dislocation behavior ahead of the notch or crack tip is challenging because of an extremely low amplitude of the AE signal. With account of this issue, two new practically oriented criteria for recognition of different stages of fatigue are proposed on the basis of AE data: (1) a power spectrum-based criterion and (2) a pattern recognition-based criterion utilizing modern clustering algorithms. The applicability of both criteria is verified using obtained AE data. A good correspondence between AE outcomes and experimental observations of the fatigue behavior was obtained and is discussed. View Full-Text
Keywords: acoustic emission; spectral analysis; fatigue; welded joints acoustic emission; spectral analysis; fatigue; welded joints

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Rastegaev, I.; Danyuk, A.; Afanas’yev, M.; Merson, D.; Berto, F.; Vinogradov, A. Acoustic Emission Assessment of Impending Fracture in a Cyclically Loading Structural Steel. Metals 2016, 6, 266.

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