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Proceedings Paper

Acoustic signatures of different damage modes in plain and repaired granite specimens
Author(s): A. C. Mpalaskas; T. E. Matikas; D. Van Hemelrijck; S. Iliopoulos; G. S. Papakitsos; D. G. Aggelis
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Paper Abstract

In construction sector marble and granite are widespread because of their unique properties through the centuries. The issue of repair in these materials is crucial in structural integrity and maintenance of the monuments through the world, as well as in modern buildings. In this study fracture experiments on granite specimens are conducted. The goal is to compare the typical acoustic emission (AE) signals from different modes (namely bending and shear) in plain granite and marble specimens as well as repaired in the crack surface with polyester adhesive. The distinct signature of the cracking modes is reflected on acoustic waveform parameters like the amplitude, rise time and frequency. Conclusions about how the repair affects the mechanical properties as well as the acoustic waveform parameters are drawn. Results show that AE helps to characterize the shift between dominant fracture modes using a simple analysis of AE descriptors as well as the integrity of the specimen (plain or repaired). This offers the potential for in-situ application mainly in the maintenance of the monuments where the need for continuous and nondestructive monitoring is imperative, but always care should be taken for the distortion of the signal, which increases with the propagation distance and can seriously mask the results in an actual case.

Paper Details

Date Published: 27 March 2015
PDF: 10 pages
Proc. SPIE 9439, Smart Materials and Nondestructive Evaluation for Energy Systems 2015, 94390L (27 March 2015); doi: 10.1117/12.2085040
Show Author Affiliations
A. C. Mpalaskas, Univ. of Ioannina (Greece)
T. E. Matikas, Univ. of Ioannina (Greece)
D. Van Hemelrijck, Free Univ. of Brussels (Belgium)
S. Iliopoulos, Free Univ. of Brussels (Belgium)
G. S. Papakitsos, Univ. of Ioannina (Greece)
D. G. Aggelis, Free Univ. of Brussels (Belgium)

Published in SPIE Proceedings Vol. 9439:
Smart Materials and Nondestructive Evaluation for Energy Systems 2015
Norbert G. Meyendorf, Editor(s)

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