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Sant'Ambrogio di Torino, Italy

Carpinteri A.,Polytechnic University of Turin | Lacidogna G.,Polytechnic University of Turin | Niccolini G.,National Research Institute of Metrology INRiM
Structural Control and Health Monitoring | Year: 2011

This paper presents a research work in which the stability of a multi-storeyed building in reinforced concrete, with two visible macrocracks periodically subjected to visual inspection, is assessed by the acoustic emission (AE) technique. The observed proportionality between the rates of recorded AE activity from the cracks and the measured crack growth rates confirms significantly the effectiveness of the AE technique for damage evolution assessment in structural elements. The AE activity has been correlated with the size of the source crack advancements by some fitting relationships established using models from Damage Mechanics, Fracture Mechanics and Geophysics. Copyright © 2010 John Wiley & Sons, Ltd.

Lacidogna G.,Polytechnic University of Turin | Carpinteri A.,Polytechnic University of Turin | Manuello A.,Polytechnic University of Turin | Durin G.,National Research Institute of Metrology INRiM | And 3 more authors.
Strain | Year: 2011

In this work, we measured the electromagnetic field, given by the moving charges, during laboratory fracture experiments on specimens made of different heterogeneous materials. We investigated the mechanical behaviour of concrete and rocks samples loaded up to their failure by the analysis of acoustic emission (AE) and electromagnetic emission (EME). All specimens were tested in compression at a constant displacement rate and monitored by piezoelectric (PZT) transducers for AE data acquisition. Simultaneous investigation into magnetic activity was performed by a measuring device calibrated according to metrological requirements. In all the considered cases, the presence of AE signals has been always observed during the damage process, whereas it is very interesting to note that the magnetic signals were generally observed only in correspondence to sharp stress drops or the final collapse. © 2010 Blackwell Publishing Ltd.

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