Detection of a Crack and Determination of Its Position in a Plate by the Nonlinear Modulation Method Using Lamb Waves

被引:2
作者
Kazakov, V. V. [1 ]
机构
[1] Russian Acad Sci, Inst Appl Phys, Nizhnii Novgorod, Russia
关键词
ACOUSTIC NONLINEARITY; DAMAGE; NDE;
D O I
10.1007/s11141-018-9910-7
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Features of detection of a single crack in a plate are experimentally studied by the nonlinear acoustic modulation method provided that single defects (cracks and cavities) are located between a low-frequency (tens of kilohertz) ultrasonic transducer of Lamb waves and a high-frequency (units of megahertz) ultrasonic transducer. It is shown that using modulation of the defect characteristics by a sequence of phase-inverted Lamb waves, by the level of modulation of the high-frequency wave reflected from the defect one can determine its type (a crack or a cavity). Changing step by step the interaction region of low-frequency and high-frequency waves by varying a delay between their radiation, it is possible to study selectively the nonlinear acoustic characteristics of the defects arranged in series on the location path. Based on the obtained results, we created a combined transducer which scans a defect and modulates its characteristics simultaneously in the preset area and which is suitable for moving it by hand on the surface of a plate for seeking hidden cracks.
引用
收藏
页码:491 / 499
页数:9
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