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Fracture mechanisms of quasi-brittle materials based on acoustic emission

Published online by Cambridge University Press:  31 January 2011

A. K. Maji ,
C. Ouyang  and
S. P. Shah
A. K. Maji
Affiliation:
Assistant Professor in the Department of Civil Engineering, The University of New Mexico
C. Ouyang
Affiliation:
Research Associate at NSF Science and Technology Center for Advanced Cement-Based Materials at Northwestern University, Evanston, Illinois 60208
S. P. Shah
Affiliation:
Professor and Director of NSF Science and Technology Center for Advanced Cement-Based Materials at Northwestern University, Evanston, Illinois 60208
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Abstract

Recently acoustic emission (AE) techniques have been used to study crack propagation in materials. The application of these techniques to heterogeneous, quasi-brittle materials such as concrete requires a better understanding of how the signal generated from a microfracture is transformed due to wave propagation and due to the transducer response. In this study, piezoelectric transducers were calibrated using displacement transducers. The validity of an elastodynamic Green's function approach was examined for cement-based materials. The acoustic emission source was characterized using moment tensor analysis. Acoustic emission measurements were analyzed for center-cracked-plate specimens of mortar and concrete. It was observed that, as expected, the dominant mode of cracking was mode I (tensile). However, mode II (shear) and mixed mode cracks also occurred, perhaps due to grain boundary sliding and interface debonding. Microfractures appear to localize prior to critical crack propagation. Mode I cracks generally required more energy release than mode II and a smaller inclusion provided a stronger interface bond than the larger ones.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 1 , January 1990 , pp. 206 - 217
Copyright
Copyright © Materials Research Society 1990

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