Laser ultrasonic testing technology for carbon fiber reinforced resin braided composites based on air-coupled transducer

LIU Xu; WU Junwei; HE Yong; YUAN Maodan; DENG Lijun; ZHANG Yongkang; ZENG Lvming; JI Xuanrong

doi:10.13801/j.cnki.fhclxb.20201210.003

Volume 38 Issue 9

Sep. 2021

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LIU Xu, WU Junwei, HE Yong, et al. Laser ultrasonic testing technology for carbon fiber reinforced resin braided composites based on air-coupled transducer[J]. Acta Materiae Compositae Sinica, 2021, 38(9): 2829-2838. doi: 10.13801/j.cnki.fhclxb.20201210.003

Citation:

LIU Xu, WU Junwei, HE Yong, et al. Laser ultrasonic testing technology for carbon fiber reinforced resin braided composites based on air-coupled transducer[J]. Acta Materiae Compositae Sinica, 2021, 38(9): 2829-2838. doi: 10.13801/j.cnki.fhclxb.20201210.003

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Laser ultrasonic testing technology for carbon fiber reinforced resin braided composites based on air-coupled transducer

doi: 10.13801/j.cnki.fhclxb.20201210.003

LIU Xu¹,
WU Junwei¹,
HE Yong¹,
YUAN Maodan¹,
DENG Lijun^{1, 2},
ZHANG Yongkang¹,
ZENG Lvming^{1, 2
,
,},
JI Xuanrong^{1
,
,}

1.
State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong University of Technology, Guangzhou 510006, China
2.
Key Lab of Optic-Electronic and Communication, Jiangxi Science and Technology Normal University, Nanchang 330038, China

Received Date: 2020-09-21
Accepted Date: 2020-12-01
Rev Recd Date: 2020-11-16

Available Online: 2020-12-11

Publish Date: 2021-09-01

Abstract

Abstract

Due to its non-contact, no coupling agent, fast and high resolution nature, laser ultrasonic technology has great potential in the detection of defects of anisotropic carbon fiber braided composites. In this paper, the finite element method was used to analyze the effect of the excitation position and braided structure on the ultrasonic signal excited by the laser point source, also the propagation law and energy distribution characteristics of the elastic wave inside the material were obtained. A non-contact laser ultrasonic C-scan imaging system was built based on a 1 MHz air-coupled transducer, and the experiments of near-surface micro structure and internal defect detection in plain and satin carbon fiber braided composites were carried out. The experimental results have shown that the spatial distribution characteristics of the near-surface resin capsule, carbon fiber bundle shape, orientation, size and internal defects and so on in the carbon fiber braided composites can be observed with high resolution by employing the laser air-coupled ultrasonic imaging technique. It provides an effective method of the micro structure characterization and defect detection for the aerospace composites.
- braided composites,
- laser ultrasound,
- air-coupled transducer,
- non-destructive testing,
- defect
Long Abstrsct
Innovation Points

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References(22)

References

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