Guided wave imaging of oblique reflecting interfaces in pipes using common-source synthetic focusing

Sun, Zeqing; Sun, Anyu; Ju, Bing‐Feng

doi:10.1016/j.jsv.2018.01.012

Cited by 7 publications

(4 citation statements)

References 28 publications

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“…Compared with the bulk wave, the guided wave has the characteristics of dispersion and multimodes, which increase the difficulty of interpretation (Lowe and Cawley 2006). However, if the complexity of guided waves is properly utilized, it can provide more information about the defect (Sun et al 2018). Therefore, the choice of the excitation mode and frequency is critical for pipe inspection with guided waves.…”

Section: Mode Characteristics and Frequency Range Of Guided Wavesmentioning

confidence: 99%

Evaluation of Cross-Sectional Deformation in Pipes Using Reflection of Fundamental Guided-Waves

Zhu

et al. 2022

J. Eng. Mech.

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Ultrasonic guided wave technology has been successfully applied to detect multiple types of defects in pipes. However, cross-sectional deformation, which is a common defect, is less studied as compared to structural discontinuity defects in pipes. In this paper, the guided wave is employed to detect cross-sectional deformation. First, the effect of section deformation parameters on the reflection of guided waves is analyzed using a series of three-dimensional finite element (FE) models, and the deformation parameters affecting the reflection are examined in light of the physics of the guided waves based on the FE results. The results show that the reflection occurs at the start of the crosssectional deformation, while the subsequent gradual deformation region does not cause reflection. The reflection coefficient is dependent on the axial deformation severity and the mode conversion ratio is dependent on the circumferential deformation extent. Secondly, an experimental study was conducted to evaluate the guided wave reflection characteristics due to the pipe cross-sectional deformation in a realistic situation. Test pipes with local and overall deformation cases were manufactured, and the reflection from both types of deformation was investigated experimentally. The results show good agreement between the experimental measurement and FE prediction. Two quantitative parameters, namely axial deformation rate δ and circumferential deformation rate β are defined to represent the cross-sectional deformation, and these parameters are found to well correlate with the reflection 2 coefficient and mode conversion ratio. The ratio of δ/β is suitable to be used to judge the deformation type.

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Section: Mode Characteristics and Frequency Range Of Guided Wavesmentioning

confidence: 99%

Evaluation of Cross-Sectional Deformation in Pipes Using Reflection of Fundamental Guided-Waves

Zhu

et al. 2022

J. Eng. Mech.

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“…While conventional ultrasonic testing utilizes two single devices for transmitting and receiving, phased array ultrasonic utilizes multiple devices. Unlike conventional methods, phased-array devices utilize ultrasonic waves with different refraction angles and superimposed ultrasonic waves, allowing the detection results to be visualized in a three-dimensional image [ 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Defect Detection of Anchor Bolts Using Non-Destructive Testing Techniques

2023

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Anchor bolts are often used for fixing information boards, supports, and soundproof walls in various facilities. Corrosion of anchor bolts and fatigue cracks occur frequently due to the various external environments, and visual inspection and hammering inspection are mainly used. In visual inspection, it is difficult to confirm corrosion or fatigue cracks of anchor bolts in the area where foundations, nuts, and base plates are installed. Additionally, the hammering inspection is easily affected by the surrounding environment and the subjective reaction of the tester. Therefore, it is necessary to develop a method that can easily and accurately detect defects such as cracks and corrosion occurring in anchor bolts installed in road facilities using non-destructive testing techniques. In this paper, the possibility and reliability of anchor bolt defects such as corrosion and cracks were experimentally verified by applying ultrasonic inspection among non-destructive inspection techniques for anchor bolt maintenance.

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“…Furthermore, ultrasonic waves sensed through electro-magnetic acoustic transducer actuators were also used to meet the requirements from practical applications (Dhayalan and Balasubramaniam, 2010; Clough et al , 2017). Common-source synthetic focusing was used to reconstruct defect images from the guided wave signals, where filters operating in the spectral domain of wavenumber, circumferential order and frequency were designed to suppress the signal components of unwanted mode-family and unwanted traveling direction (Sun et al , 2018).…”

Section: Introductionmentioning

confidence: 99%

Circumferential defect detection using ultrasonic guided waves

Dong

Shang

et al. 2020

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Purpose Quantitatively detecting surface defects in a circular annulus with high levels of accuracy and efficiency has been paid more attention by researchers. The purpose of this study is to investigate the theoretical dispersion equations for circumferential guided waves and then develop an efficient technique for accurate reconstruction of defects in pipes. Design/methodology/approach The methodology applied to determine defects in pipelines includes four steps. First, the theoretical work is carried out by developing the appropriate dispersion equations for circumferential guided waves in a pipe. In this phase, formulations of strain-displacement relations are derived in a general equidistant surface coordinate. Following that, a semi-analytical finite element method (SAFEM) is applied to solve the dispersion equations. Then, the scattered fields in a circular annulus are calculated using the developed hybrid finite element method and simulation results are in accord with the law of conservation of energy. Finally, the quantitative detection of Fourier transform (QDFT) approach is further enhanced to efficiently reconstruct the defects in the circular annuli, which have been widely used for engineering applications. Findings Results obtained from four numerical examples of flaw detection problems demonstrate the correctness of the developed QDFT approach in terms of accuracy and efficiency. Reconstruction of circumferential surface defects using the extended QDFT method can be performed without involving the analytical formulations. Therefore, the streamlined process of inspecting surface defects is well established and this leads to the reduced time in practical engineering tests. Originality/value In this paper, the general dispersion equations for circumferential ultrasonic guided waves have been derived using an equidistant surface coordinate and solved by the SAFEM technique to discover the relationship between wavenumber of a wave and its frequency. To reconstruct defects with high levels of accuracy and efficiency, the QDFT approach has been further enhanced to inspect defects in the annular structure.

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Guided wave imaging of oblique reflecting interfaces in pipes using common-source synthetic focusing

Cited by 7 publications

References 28 publications

Evaluation of Cross-Sectional Deformation in Pipes Using Reflection of Fundamental Guided-Waves

Evaluation of Cross-Sectional Deformation in Pipes Using Reflection of Fundamental Guided-Waves

An Experimental Study on Defect Detection of Anchor Bolts Using Non-Destructive Testing Techniques

Circumferential defect detection using ultrasonic guided waves

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