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Smart Structures and Systems Volume 4, Number 4, July 2008 , pages 391-406 DOI: https://doi.org/10.12989/sss.2008.4.4.391 |
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Debonding monitoring of CFRP strengthened RC beams using active sensing and infrared imaging |
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Hoon Sohn, Seung Dae Kim, Chi Won In, Kelly E. Cronin and Kent Harries
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| Abstract | ||
| This study attempts to develop a real-time debonding monitoring system for carbon fiber-reinforced polymer (CFRP) strengthened structures by continuously inspecting the bonding condition between the CFRP layer and the host structure. The uniqueness of this study is in developing a new concept and theoretical framework of nondestructive testing (NDT), in which debonding is detected without relying on previously-obtained baseline data. The proposed reference-free damage diagnosis is achieved based on the concept of time reversal acoustics (TRA). In TRA, an input signal at an excitation point can be reconstructed if the response signal measured at another point is reemitted to the original excitation point after being reversed in the time domain. Examining the deviation of the reconstructed signal from the known initial input signal allows instantaneous identification of damage without requiring a baseline signal representing the undamaged state for comparison. The concept of TRA has been extended to guided wave propagations within the CFRP-strengthened reinforced concrete (RC) beams to improve the detectibility of local debonding. Monotonic and fatigue load tests of large-scale CFRP-strengthened RC beams are conducted to demonstrate the potential of the proposed reference-free debonding monitoring system. Comparisons with an electro-mechanical impedance method and an inferred imaging technique are provided as well. | ||
| Key Words | ||
| active sensing; baseline-free nondestructive testing; carbon fiber reinforced polymer; debonding; structural health monitoring; time-reversal acoustics. | ||
| Address | ||
| Hoon Sohn; Department of Civil & Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea Seung Dae Kim, Chi Won In, and Kelly E. Cronin; Carnegie Mellon University, Pittsburgh, PA 15213, USA Kent Harries; University of Pittsburgh, Pittsburgh, PA 15261, USA | ||