Fracture process zone size and true fracture energy of concrete using acoustic emission

Muralidhara, S and Prasad, BK Raghu and Eskandari, Hamid and Karihaloo, BL (2010) Fracture process zone size and true fracture energy of concrete using acoustic emission. In: Construction and Building Materials, 24 (4). pp. 479-486.

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Abstract

Acoustic emission (AE) energy, instead of amplitude, associated with each of the event is used to estimate the fracture process zone (FPZ) size. A steep increase in the cumulative AE energy of the events with respect to time is correlated with the formation of FPZ. Based on the AE energy released during these events and the locations of the events, FPZ size is obtained. The size-independent fracture energy is computed using the expressions given in the boundary effect model by least squares method since over-determined system of equations are obtained when data from several specimens are used. Instead of least squares method a different method is suggested in which the transition ligament length, measured from the plot of histograms of AE events plotted over the un-cracked ligament, is used directly to obtain size-independent fracture energy. The fracture energy thus calculated seems to be size-independent.

Item Type:	Journal Article
Publication:	Construction and Building Materials
Publisher:	Elsevier Science.
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Concrete; Acoustic emission; Fracture process zone (FPZ); True fracture energy
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	29 Mar 2010 08:10
Last Modified:	19 Sep 2010 05:58
URI:	http://eprints.iisc.ac.in/id/eprint/26657

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