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

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 du...

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Bibliographic Details
Published in:Construction & building materials 2010-04, Vol.24 (4), p.479-486
Main Authors: Muralidhara, S., Prasad, B.K. Raghu, Eskandari, Hamid, Karihaloo, B.L.
Format: Article
Language:English
Subjects:
Acoustic emission
Acoustic emission testing
Analysis
Concrete
Concretes
Construction materials
Energy use
Fracture mechanics
Fracture process zone (FPZ)
Fracture toughness
Least squares method
Ligaments
Mathematical models
Production processes
True fracture energy
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Summary: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.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2009.10.014