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Appl. Sci. 2017, 7(4), 339; doi:10.3390/app7040339

Acoustic Emission and Modal Frequency Variation in Concrete Specimens under Four-Point Bending

Department of Structural, Geotechnical and Building Engineering, Politecnico di Torino, Torino 10129, Italy
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Academic Editor: Dimitrios G. Aggelis
Received: 23 January 2017 / Revised: 20 March 2017 / Accepted: 22 March 2017 / Published: 30 March 2017
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Abstract

The Acoustic Emission (AE) and Dynamic Identification (DI) techniques were applied simultaneously, in an original way, to examine the stress dependent damage progress in pre-notched concrete beams tested in four-point bending. The damage mechanisms were characterized by analyzing the AE signals registered during the tests, conducted by increasing the specimen’s vertical deflection. In particular, the dominant fracture mode was identified, and correlations between dissipated and emitted energies were investigated. Moreover, variations in the natural bending frequencies, produced by the crack advancement under loading, were detected and put in relation with the cumulated AE energy. Two different types of piezoelectric (PZT) sensors, operating in well distinct frequency ranges, were used to measure AE and modal signals. This study may be of interest with an outlook on possible correlations between a multi-parameter structural monitoring and the solution of inverse problems by numerical models. View Full-Text
Keywords: acoustic emission; natural frequency; material damage; concrete specimen; four-point bending test; brittle failure; softening; emitted energy; dissipated energy; PZT sensor acoustic emission; natural frequency; material damage; concrete specimen; four-point bending test; brittle failure; softening; emitted energy; dissipated energy; PZT sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lacidogna, G.; Piana, G.; Carpinteri, A. Acoustic Emission and Modal Frequency Variation in Concrete Specimens under Four-Point Bending. Appl. Sci. 2017, 7, 339.

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