抄録
This paper presents a system to detect the debonding progress in skin/stringer structures in a wing box of airplanes using ultrasonic waves. This system uses piezoelectric tranducers (PZTs) to input controlled ultrasonic waves to the structures and fiber Bragg grating (FBG) sensors to receive the propagated waves. To evaluate the debonding precisely, two sensors are attached to the top and bottom surfaces of the skin/stringer structure. Comparison of received waves between these two sensors provides an effective method to determine the condition of the structures. The applicability of this proposed system to the debonding detection was demonstrated by experimental studies. To investigate the influence of the debonding, a perfectly bonded specimen and a specimen with debonding were prepared. The results showed that the wave propagation path and received waveform were affected by the debonding. In particular, the maximum amplitude ratio and the arrival time difference were found to be effective parameters to evaluate the debonding progress quantitatively.
