Ultrasonic Guided Wave Inspection in Small-Sized Stainless Pipes
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摘要: 介绍了超声导波检测的基本理论，利用不同数量的压电陶瓷换能器，选用70 kHz、10个周期经汉宁窗调制的正弦波信号，对无缺陷和带有裂纹缺陷的 8 mm×1.5 mm的小径不锈钢管进行了超声导波检测，讨论了超声导波的频散和多模态现象。试验成功激发出L(0,1)模态导波，结果表明对于此种小径管，采用两发两收的方式得到的波形会更好，并能有效地检测出一定尺寸的裂纹缺陷。Abstract: The basic theory of ultrasonic guided wave testing is introduced. By using different number of piezoelectric transducers, and adopting 10 cycles of modulated sinusoidal signal at 70 kHz through Hanning window, ultrasonic guided wave testing experiments in small-sized stainless pipe(8 mm in diameter and 1.5 mm in thickness) with crack defect and no defect are respectively conducted. The frequency dispersion and multi-mode phenomenon of guided waves is discussed. L(0,1) mode is excited successfully, and the results show that for such a small pipe, the echo waveforms are better by using two transducers to excite and other two transducers to receive. In addition, a certain size crack defects can be detected effectively.
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Keywords:
- Small-sized pipes /
- Guided waves /
- Flaw detection /
- Piezoelectric ceramic transducer
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