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摘要:
Experimental defect detections in curved pipes was carried out by using ultrasonic guided wave technique. Different kinds of defects including artificial circumferential defects and structural defects were detected using longitudinal mode L(0, 2) at certain frequencies excited by length-expanding and contracting piezoelectric elements distributed uniformly along circumferential direction in 90° curved pipes. Effects of circumferential defect dimensional variations on waveform amplitudes reflected from the defects and the ends were analyzed. Multi-defect detection in curved pipe was studied as well. Experimental results show that ultrasonic guided wave inspection technique can be used to detect defects with different positions and types in curved pipes. Useful exploration is done to detect defects in more complicated pipe system using ultrasonic guided waves.
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来源 :
China Mechanical Engineering
ISSN: 1004-132X
年份: 2005
期: 18
卷: 16
页码: 1662-1665
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