| More and more not uniform thickness metal and nonmetallic compound components have been widely applied in aeronautics industry for their superior performances. The accident is often disastrous for adhesive interface debonding in the use process. So it is urgently needed to make an accurate detection for the adhesive quality of interface and insure the quality and use security of the products. According to the characteristic of the not uniform thickness compound component, phased array ultrasonic testing method is proposed to detect debonding on adhesive interface of this component.Based on the beam control theory, the phase delay mathematical model is established and the feasibility and the superiority of phased array ultrasonic debond testing technology on the not uniform thickness component is analyzed. The following analysis mainly focus on the influence of the sound field directivity of phased array probe, time delay precision and the system independent channels to the ultrasonic testing resolution. According to the test precision request, the specific experimental parameters of the system and probe is given. And then, focused refraction sound field of multi-layer mediums is simulated using the parameters. Debond testing experiment of not uniform thickness has carried on separately using the ordinary focused probe and the phased array probe. This paper synthesizes the experimental data of phased array probe making use of the focusing rule and the software time delay technology, then get the C-scan image and binary image to calculate the position and area of the debonding region. Comparing the testing results of phased array probe method and ordinary focused probe method, it can conclude that the phased array probe method has higher testing resolution and testing ability.Above all, the research findings above have great significance for the development of phased array ultrasonic testing technology.
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