Abstract
A novel method combining the time-reversal method (TRM) with wavelet analysis was proposed for damage imaging in mesoscale concrete modeling. The damage was imaged by the convergence of time-reversed wave signals after wavelet analysis. Through numerical study, three concrete models of different damage sizes were built with randomly distributed aggregate particles. The time-reversal process was simulated using the reverse damage-scattered ultrasonic wave signals as excitations recorded by the sensors. Then, the wavelet analysis was employed to extract certain frequency component, which can enhance detection precision and the signal-to-noise ratio. The damage imaging showed clearly the location of the defect. The results from experimental testing also demonstrated that this detection technique is an efficient and effective method for damage imaging in mesoscale concrete.
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Acknowledgements
The work described in this article was supported by the National Natural Science Foundation of China (Grant Nos. 11520101001 and 11702118), the Natural Science Foundation of Jiangsu Province (Grant No. 17KJB130005) and the Basic Research Program of Jiangsu Education Department (Grant No. BK20170520), all of which are gratefully acknowledged.
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Feng, K., Zhao, Q. & Qiu, Y. Damage Imaging in Mesoscale Concrete Modeling Based on the Ultrasonic Time-Reversal Technique. Acta Mech. Solida Sin. 33, 61–70 (2020). https://doi.org/10.1007/s10338-019-00153-z
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DOI: https://doi.org/10.1007/s10338-019-00153-z