Abstract
In this paper, axial locations of defect in elbow pipes were estimated by the T(0,1) mode guided waves. 50A Schedule 40 aluminum pipes with the JIS short-and long elbows and a 100A Schedule 40 aluminum pipe with the JIS long elbow were prepared and evaluated, respectively. The T(0,1) mode guided waves(30, 40 and 50 kHz) were generated and detected by the piezoelectric ring-shaped sensor system. In the straight regions of the elbow pipes, estimates were good agreement with the real locations of the artificial defects. In the regions beyond the elbows, the estimates were also fairly good agreement with the real locations if the calibrations of the time-delays during the propagations in elbow parts were carried out. The accuracies and errors of the estimations were discussed.
