Simulation and Experimental Investigation on the AE Tomography to Improve AE Source Location in the Concrete Structure

Acoustic emission (AE) tomography, which is based on the time-travel tomography with AE events as its signal sources, is a new visualization tool for inspecting and locating the internal damages in the structures. In this paper, AE tomography is applied to examine a man-made damage in a typical heterogeneous concrete structure to validate its effectiveness. Firstly, the finite element (ABAQUS/Explicit) simulation model of the concrete structure with one damaged circle in its center is built, and the simulated AE signals are obtained to establish the AE tomography. The results show that the damaged circle in the created model can be visualized clearly with the AE tomography in its original location. Secondly, the concrete specimen based on the FE model is fabricated, and the pencil lead break (PLB) signal is taken as the exciting source for AE tomography. It is shown that the experimental results have good consistency with the FE simulation results, which also verifies the feasibility of the finite element model for AE tomography. Finally, the damage source location based on AE tomography is compared with the traditional time of arrival (TOA) location method, and the better location accuracy is obtained with the AE tomography. The research results indicate that AE tomography has great potential in the application of structure damage detection.

[1]  Antonios Giannopoulos,et al.  Numerical modelling and experimental verification of GPR to investigate ring separation in brick masonry arch bridges , 2008 .

[2]  T. Shiotani,et al.  Repair evaluation of concrete cracks using surface and through-transmission wave measurements , 2007 .

[3]  Avinash C. Kak,et al.  Principles of computerized tomographic imaging , 2001, Classics in applied mathematics.

[4]  T Ross,et al.  Using seismic tomography and holography ground imaging to improve site investigations , 2004 .

[5]  Y. Ribakov,et al.  Effectiveness of nonlinear ultrasonic and acoustic emission evaluation of concrete with distributed damages , 2010 .

[6]  Frank Schubert.  Tomography Techniques for Acoustic Emission Monitoring , 2006 .

[8]  Tomoki Shiotani,et al.  Elastic wave validation of large concrete structures repaired by means of cement grouting , 2009 .

[9]  D. G. Aggelis.  Damage Characterisation of Inhomogeneous Materials: Experiments and Numerical Simulations of Wave Propagation , 2011 .

[10]  Fumio Ito,et al.  Visualization of failure in a pull-out test of cable bolts using X-ray CT , 2001 .

[11]  Lanbo Liu,et al.  Seismic non-destructive testing on a reinforced concrete bridge column using tomographic imaging techniques , 2005 .

[12]  T. Shiotani,et al.  GLOBAL MONITORING OF CONCRETE BRIDGE USING ACOUSTIC EMISSION , 2008 .

[13]  Frank Schubert,et al.  BASIC PRINCIPLES OF ACOUSTIC EMISSION TOMOGRAPHY , 2004 .

[14]  Tomoki Shiotani,et al.  Global Monitoring of Large Concrete Structures Using Acoustic Emission and Ultrasonic Techniques: Case Study , 2009 .

[15]  Yajai Promboon,et al.  Acoustic emission source location , 2000 .

[16]  Wolfgang Ludwig,et al.  Fast X-ray tomography and acoustic emission study of damage in metals during continuous tensile tests , 2007 .

[17]  Paul McIntire,et al.  Acoustic emission testing , 1987 .

[18]  Kevin L. Rens,et al.  ACOUSTIC TOMOGRAPHIC IMAGING OF CONCRETE INFRASTRUCTURE , 2000 .