DETECTION OF LONGITUDINAL DEFECT IN PIPES USING TORSIONAL MODES

被引：5
|
作者：
LIU Zenghua WU Bin HE Cunfu YANG Shiming WANG Xiuyan College of Mechanical Engineering and Applied Electronics Technology
机构：
来源：
Chinese Journal of Mechanical Engineering | 2006年 / 01期
基金：
中国国家自然科学基金;
关键词：
Torsional mode Pipe Longitudinal defect Detection Ultrasonic guided waves;
D O I：
暂无
中图分类号：
TB121 [工程静力学];
学科分类号：
摘要：
The multi-modes and disperse characteristics of torsional modes in pipes are investigated theoretically and experimentally. At all frequencies, both phase velocity and group velocity of the lowest torsional mode T(0,1) are constant and equal to shear wave velocity. T(0.1) mode at all frequencies is the fastest torsional mode. In the experiments, T(0,1) mode is excited and received in pipes using 9 thickness shear vibration mode piezoelectric ceramic elements. Furthermore, an artificial longitudinal defect of a 4 m long pipe is detected using T(0,1) mode at 50 kHz. Experimental results show that it is feasible for longitudinal defect detection in pipes using T(0,1) mode of ultrasonic guided waves.
引用
收藏
页码：146 / 150
页数：5
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