Nondestructive Crack Identification by Acoustic Emission Analysis and Ultrasonic Frequency Responseby Masayasu Ohtsu, Kumamoto Univ, Kumamoto, Japan,
Yasunori Sakata, Kumamoto Univ, Kumamoto, Japan,
Abstract: Nondestructive evaluation (NDE) by the acoustic emission (AE) analysis and the ultrasonic testing (UT) on the spectral (frequency) response is studied to identify crack geometry. AE waveform analysis provides information on crack locations, crack types, and crack orientations. The result on a pull-out test of anchor-bolt confirms the usefulness of the analysis. To determine the depth of surface crack, the frequency response in the UT is investigated. A reference curve determined from the ratio of peak frequencies on notched concrete beams is applied to the evaluation of crack depth. It is shown that the evaluation is applicable to not only plain concrete but also reinforced concrete members.
Subject Headings: Cracking | Reinforced concrete | Emissions | Ultrasonic methods | Acoustic techniques | Frequency analysis | Nondestructive tests | Geometrics | Concrete beams | Material tests | Utah | North America | United States
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