Abstract
The fundamental circumferential shear horizontal (CSH0) wave is of practical importance in monitoring corrosion defects in large-diameter pipes due to its virtually non-dispersive characteristics. However, so far, there have been limited CSH0 wave transducers which can be used to constitute a structural health monitoring (SHM) system for pipes. Moreover, the CSH0 wave’s capability of sizing the corrosion-like defect has not yet been confirmed by experiments. In this work, firstly, the mechanism of exciting CSH waves was analyzed. A method based on our previously developed bidirectional SH wave piezoelectric transducers was then proposed to excite the pure CSH0 mode and first order circumferential shear horizontal (CSH1) mode. Both finite element simulations and experiments show that the bidirectional transducer is capable of exciting pure CSH0 mode traveling in both circumferential directions of a 1-mm thick steel pipe from 100 to 300 kHz. Moreover, this transducer can also serve a sensor to detect CSH0 mode only by filtering circumferential Lamb waves over a wide frequency range from 100 to 450 kHz. After that, a method of sizing a rectangular notch defect by using CSH0 wave was proposed. Experiments on an 11-mm thick steel pipe show that the depth and circumferential extent of a notch can be accurately determined by using the proposed method. Finally, experiments were performed to investigate the reflection and transmission characteristics of CSH0 and CSH1 waves from notches with different depths. It was found that transmission coefficients of CSH0 mode decrease with the increasing of notch depth, which indicates that it is possible to monitor the depth change of corrosion defects by using CSH0 wave.
Highlights
Wall thinning due to corrosion in pipes is a serious problem in the oil and chemical industries.The ultrasonic bulk-wave-based nondestructive testing (NDT) technique and magnetic flux leakage method are available for detecting wall thinning
CSH0 mode is more useful than CSH1 mode to monitor the change of the defect depth by using the transmission coefficient
Results show that the bidirectional piezoelectric transducer is capable of exciting pure CSH0 mode traveling in both circumferential directions of a 1-mm thick steel pipe from 100 to 300 kHz
Summary
Wall thinning due to corrosion in pipes is a serious problem in the oil and chemical industries. 2) and T(0, 1) modes are axially symmetric, so they have difficulty to locate the defect circumferential position This problem becomes more serious in large-diameter pipes, pipes, which which drives position and andsize sizethe thedefect. This problem becomes more serious in large-diameter researchers to develop circumferential guided-wave-based damage identification method [13,14,15,16,17]. As for long range pipes, such as oil circumferential guided waves can be a good supplement to axial guided wave inspection. Circumferential guided waves can be a good supplement to axial guided wave pipes can be inspected by using a combination of axial and circumferential guided waves. Prone to generating defects [18]
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