Journal
ULTRASONICS
Volume 44, Issue -, Pages E1135-E1138Publisher
ELSEVIER
DOI: 10.1016/j.ultras.2006.05.154
Keywords
torsional mode; defect; pipe; thickness shear mode piezoelectric element
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Different kinds of defects, such as corrosions, notches and cracks etc, exist in pipes. Mode choice is important since unfortunately not all ultrasonic guided wave modes are suitable for these kinds of defect detection. T( 0, 1) mode which is non-dispersive is the lowest and fastest torsional mode and most suitable for defect detection in pipes. Two completely different artifical defects including longitudinal and circumferential defects are processed successively in a 4-m-long, 60-mm-OD, 3.5-mm-wall steel pipe. T( 0, 1) mode at 45 kHz is excited to detect these defects using thickness shear mode piezoelectric elements. Experimental results show that two kinds of defects are detectable using T( 0, 1) mode. Comparing with longitudinal modes, torsional modes are dominant in pipe inspection for their sensitivities to different kinds of defects. (c) 2006 Published by Elsevier B. V.
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