MODE CONVERSION OF TORSIONAL WAVES GENERATED BY ELECTROMAGNETIC ACOUSTIC TRANSDUCER

被引：6
|
作者：
Nurmalia [1 ]
Nakamura, N. [1 ]
Ogi, H. [1 ]
Hirao, M. [1 ]
机构：
[1] Osaka Univ, Grad Sch Engn Sci, Toyonaka, Osaka 5608531, Japan
来源：
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 32A AND 32B | 2013年 / 1511卷
关键词：
Torsional Waves; Pipe Inspection; Mode Conversion; Electromagnetic Acoustic Transducer; GUIDED-WAVES; DEFECTS; SCATTERING;
D O I：
10.1063/1.4789141
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Change in group velocity of torsional guided waves induced by mode conversion is investigated for wall-thinning inspection of pipe. The fundamental and second torsional modes are generated and detected by the Lorentz-force-type electromagnetic acoustic transducers (EMATs) in aluminum pipes with fabricated-thinning region. Traveling time of the higher mode in the axial direction varies depending on the thickness of the thinning regions and drops suddenly when the thickness is smaller than the cut-off thickness. From comparison with calculated dispersion relation, the drop is attributed to mode conversion from a higher mode to a lower mode with higher group velocity.
引用
收藏
页码：909 / 915
页数：7
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