Detection on debonding damage of fiber reinforced polymer composite strengthened concrete structure based on laser ultrasonic second harmonic generation technology

XU Ying; ZHENG Qian; WANG Shuai

doi:10.13801/j.cnki.fhclxb.20200518.001

Volume 38 Issue 1

Jan. 2021

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XU Ying, ZHENG Qian, WANG Shuai. Detection on debonding damage of fiber reinforced polymer composite strengthened concrete structure based on laser ultrasonic second harmonic generation technology[J]. Acta Materiae Compositae Sinica, 2021, 38(1): 255-267. doi: 10.13801/j.cnki.fhclxb.20200518.001

Citation:

XU Ying, ZHENG Qian, WANG Shuai. Detection on debonding damage of fiber reinforced polymer composite strengthened concrete structure based on laser ultrasonic second harmonic generation technology[J]. Acta Materiae Compositae Sinica, 2021, 38(1): 255-267. doi: 10.13801/j.cnki.fhclxb.20200518.001

Citation:

XU Ying, ZHENG Qian, WANG Shuai. Detection on debonding damage of fiber reinforced polymer composite strengthened concrete structure based on laser ultrasonic second harmonic generation technology[J]. Acta Materiae Compositae Sinica, 2021, 38(1): 255-267. doi: 10.13801/j.cnki.fhclxb.20200518.001

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Detection on debonding damage of fiber reinforced polymer composite strengthened concrete structure based on laser ultrasonic second harmonic generation technology

doi: 10.13801/j.cnki.fhclxb.20200518.001

Shenzhen Key Lab of Urban & Civil Engineering Disaster Prevention & Reduction, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China

Received Date: 2020-03-18
Accepted Date: 2020-05-04

Available Online: 2020-05-18

Publish Date: 2021-01-15

Abstract

Abstract

The early debonding damage of fiber reinforced polymer (FRP) composite strengthened concrete structure tends to be closed state, which can not be detected and located by traditional linear ultrasonic technology. Based on the continuous laser excited narrow-band ultrasonic technology combined with the nonlinear ultrasonic second harmonic method, a method of detecting the debonding damage of FRP composite strengthened concrete was proposed. This method uses intensity modulated laser technology to excite narrow-band ultrasonic surface wave on the surface of the reinforced structure. Under the ultrasonic disturbance, according to the contact nonlinear theory of the spring model, the debonding damage in the structure is in the boundary. The opening and closing effect will be produced on the surface, and the location of peel damage will be detected by acoustic nonlinear second harmonic response. Based on the results of simulation and experiment, the feasibility of this method for early debonding damage detection of FRP composite strengthened concrete structure was verified, and the non-contact and high sensitivity damage detection of FRP composite strengthened concrete structure was realized.
- laser ultrasonic,
- second harmonic wave,
- fiber reinforced polymer (FRP) composite strengthened concrete structure,
- debonding damage,
- finite element analysis
Long Abstrsct
Innovation Points

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References(25)

References

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