Debonding detection in FRP-strengthened concrete structures utilising nonlinear Rayleigh wave mixing

Cao, Yuqiao; Ng, Ching‐Tai; Smith, Scott T

doi:10.1016/j.measurement.2023.112736

Cited by 13 publications

(1 citation statement)

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“…They investigated the second-and third-order combinational harmonic generation and showed that they can be used for detecting micro-damage in concrete. Cao et al [13] employed nonlinear Rayleigh wave mixing to detect debonding damage in CFRP-retrofitted reinforced concrete. They proposed to use the combinational harmonic generation of the Rayleigh wave due to the contact nonlinearity at debonding between the CFRP and concrete for damage detection.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of heat damage evaluation using nonlinear ultrasonic guided waves

Ng,

Aseem

2024

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2024

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Nonlinear ultrasonic guided waves have attracted increasing attention in non-destructive evaluation (NDE) due to their advantages over linear ultrasonic guided waves, e.g. potential to be a baseline-free technique for damage detection and higher sensitivity to incipient damage in structures. This study presents an experimental investigation of using nonlinear ultrasonic guided waves to evaluate damage when reinforced concrete beams are subjected to high temperatures. In this study, the reinforced concrete beam specimens are heated up to high temperatures in a furnace and it shows that the high temperatures induce debonding between rebar and concrete. Ultrasonic guided wave inspection is carried out at different high temperatures. When the ultrasonic guided wave interacts with the debonding between rebar and concrete, the second harmonic, which is one of the nonlinear features of ultrasonic guided waves, is generated due to contact acoustic nonlinearity (CAN). In this study, a nonlinear parameter is defined to quantify the second harmonic generation due to different levels of debonding damage in the reinforced concrete beams at different temperatures. The relationship between the debonding damage caused by the high temperature and the characteristics of the nonlinear parameter is studied. The results show that the nonlinear parameter can provide an indication of the severity of the debonding damage, and can be used to monitor the growth of the debonding damage in the reinforced concrete beams at high temperatures.

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Section: Introductionmentioning

confidence: 99%