抄録
This paper describes evaluation of obliquely stretching defect using guided waves propagating in pipes detections. Piezoelectric sensor ring having 16 sensor elements was used to generate and detect the T(0,1) mode guided waves. The inclination angles of the defects were set to be 0°, 20°, 40° and 60° to the axial direction of the pipes. In this paper, the signal amplitudes were shown as a function of the defect depth gradually increased in the experiments. The obtained results showed that the sensitivities of the defects were not so much different between the defects having 0°, 20°, 40° inclinations. Conversely, as for the 60° defect, sensitivity was a little bit poor and a unique phenomenon was observed comparing to the other defects.
