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Fracture process zone size and true fracture energy of plain concrete from acoustic emission catalogue

Muralidhara, S., Raghu Prasad, B. K., Eskandari, H. and Karihaloo, Bhushan Lal 2010. Fracture process zone size and true fracture energy of plain concrete from acoustic emission catalogue. Construction and Building Materials 24 (4) , pp. 479-486. 10.1016/j.conbuildmat.2009.10.014

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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: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TH Building construction
Uncontrolled Keywords: Concrete; Acoustic emission; Fracture process zone (FPZ); True fracture energy
Publisher: Elsevier
ISSN: 0950-0618
Last Modified: 04 Jun 2017 02:02

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