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Nondestructive Crack Identification by Acoustic Emission Analysis and Ultrasonic Frequency Response

by Masayasu Ohtsu, Kumamoto Univ, Kumamoto, Japan,
Yasunori Sakata, Kumamoto Univ, Kumamoto, Japan,



Document Type: Proceeding Paper

Part of: Nondestructive Testing of Concrete Elements and Structures

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 | Nondestructive tests | Reinforced concrete | Emissions | Acoustics | Stress waves | Material tests

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