With respect to the hole defects of the carbon fiber composites, the ultrasonic C-scan imaging detection technology was used to scan the specimens with holes, and the position of the defects obtained C-scan were analyze. The holed specimens were scanned, and the appearance of the scanned image was analyzed for causing reasons. Cluster analysis was performed to establish the relationship between the actual area of the defect and the detection area, and reflection scanning and scanning electron microscopy were carried out for the holed specimens and the composite delamination was analyzed according to the scanning waveform and electron microscopy. The research results show that there is a one-to-one correspondence between the C-scan image and the position of the composite material defect, and that when the hole diameter is larger than the beam width of the focusing probe, the edge of the hole does not affect the beam penetration and energy loss. The work indicated that the ultrasonic C-scan imaging detection technology can further verify holes and delamination defects.
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