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Fabrication and Characterization of Thickness Mode Piezoelectric Devices for Atomization and Acoustofluidics
Published on: August 5, 2020
Circumferential and longitudinal defect detection using T(0,1) mode excited by thickness shear mode piezoelectric
Zenghua Liu1, Cunfu He, Bin Wu
1Modern Measurement and Control Technique Lab, College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Ping Le Yuan 100, Chaoyang District, Beijing 100022, China. LZHBULL@emails.bjut.edu.cn
Ultrasonics
|October 27, 2006
Summary
The T(0,1) torsional mode effectively detects longitudinal and circumferential defects in pipes. This non-dispersive ultrasonic guided wave mode is ideal for pipe inspection due to its sensitivity and speed.
Area of Science:
- Materials Science
- Mechanical Engineering
- Non-Destructive Testing
Background:
- Pipes are susceptible to various defects like corrosion, notches, and cracks.
- Selecting appropriate ultrasonic guided wave modes is crucial for effective defect detection.
- The T(0,1) mode is identified as a highly suitable mode for pipe inspection.
Purpose of the Study:
- To evaluate the effectiveness of the T(0,1) mode for detecting artificial longitudinal and circumferential defects in a steel pipe.
- To compare the performance of torsional modes with longitudinal modes in pipe inspection.
Main Methods:
- Utilized the T(0,1) torsional mode at 45 kHz for defect detection.
- Employed thickness shear mode piezoelectric elements for mode excitation.
- Tested on a 4-m-long, 60-mm outer diameter, 3.5-mm wall thickness steel pipe with artificial defects.
Main Results:
- Successfully detected both longitudinal and circumferential defects using the T(0,1) mode.
- Demonstrated the capability of the T(0,1) mode in identifying different types of pipe defects.
- Confirmed that torsional modes are superior to longitudinal modes for pipe inspection.
Conclusions:
- The T(0,1) mode is a highly effective ultrasonic guided wave for detecting various defects in pipes.
- Torsional modes offer greater sensitivity and are dominant in pipe inspection compared to longitudinal modes.
