期刊
COMPOSITES COMMUNICATIONS
卷 28, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.coco.2021.100915
关键词
Non-destructive testing; Laser ultrasound; Air-coupled transducer; Braided CFRP; Defect detection; Microstructure
资金
- Guangdong Province Introduction of Innovation RD Team [2016ZT06G375]
- National Key Research and Development Program of China [2018YFB1107703]
- National Natural Science Foundation of China [51975131, 11804059, 51805097]
This paper presents a hybrid system for detecting microstructure and defects in braided CFRP that combines the advantages of laser-ultrasound and air-coupled ultrasonic testing, showing the potential for developing a non-contact, high-resolution, and low-cost method for the detection and repairment of advanced composite materials.
Defect inspection of braided carbon fiber reinforced polymer (CFRP) is very difficult due to its nonhomogeneity, anisotropy, and sensitivity to coupling agents. This paper presents a hybrid system for detecting microstructure and defects in braided CFRP that combines the advantages of laser-ultrasound and air-coupled ultrasonic testing. Through the finite element method, the ultrasonic field propagating on the braided CFRP was simulated during the laser-induced ultrasound, and the influences of laser parameters and surface braided structure were analyzed on the laser ultrasonic signal. This detection method based on air-coupled laser ultrasound can provide the nearsurface microstructure characterization of the resin pockets and braided fiber bundles, and also can achieve both shallow and deep defect detection of CFRP sheets which is comparable to that of the contact-type high-frequency phased array with higher contrast and less distortion. These results indicate that it has the potential to develop a non-contact, high-resolution, and low-cost method for the detection and repairment of advanced composite materials.
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