Abstract: Carbon fiber composite material of high specific strength and specific modulus, aerospace systems to meet the special requirements of the quality of the relief structure, has been applied to the field of aerospace and missile weapons carrier. It has been used in the field of space transportation and missile weapons. The fiber-wound solid rocket motor shell may cause serious effects when the bonding structure is unreliable due to the complicated force in the bonding connection area. In this paper, phased array ultrasonic testing technology is used for debonding detection research, making different sizes of debonding defects for testing experiments, using variational modal decomposition method to reduce the noise generated by the water coupling interface, and through the echo signal Delayed superposition is performed to obtain the debonding defect signal, and the detection accuracy is up to 1 mm. The test results show that the phased array ultrasound is feasible and accurate for the debonding detection of carbon fiber composite engine casing.

Key words: carbon fiber composite materials, phased array, non-destructive testing