Damage Assessment in Concrete Using Acoustic Emissionby C. Ouyang, Northwestern Univ, Evanston, United States,
E. Landis, Northwestern Univ, Evanston, United States,
S. P. Shah, Northwestern Univ, Evanston, United States,
Abstract: An acoustic emission (AE) is a localized rapid release of strain energy in a stressed material. This energy release causes stress waves to propagate through the specimen. These acoustic emissions can be detected at the specimen surface and analyzed to deduce the nature of damage such as microcracking. AE techniques were used to characterize fracture of center-notched and off-center-notched concrete beams in this paper. AE event locations were recovered from the arrival time of AE signals. Orientation of the plane, location, size, and mode of movement (mode I, mode II, or mixed mode) of microcracks were determined using a moment tensor analysis.
Subject Headings: Cracking | Concrete | Acoustic techniques | Emissions | Stress waves | Concrete beams | Material tests | Strain
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