Lamb wave tomography for defect localization using wideband dispersion reversal method

Ling, Feiyao; Chen, Honglei; Lang, Yanfeng; Yang, Zhibo; Xu, Kailiang; Ta, Dean

doi:10.1016/j.measurement.2023.112965

Cited by 8 publications

(2 citation statements)

References 33 publications

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“…However, this approach is only appropriate for detecting the surface cracks of structural members. In contrast, the tomography imaging method is able to gain insights to internal defects using ultrasonic technology and, therefore, it has attracted more and more attention in the nondestructive testing of building structures [ 25 ]. Typically, tomography techniques, including attenuation tomography (AT) [ 26 ] and travel time tomography (TTT) [ 27 , 28 ], are able to detect defects in concrete structures composed of a single material.…”

Section: Introductionmentioning

confidence: 99%

A Concrete Core Void Imaging Approach and Parameter Analysis of Concrete-Filled Steel Tube Members Using Travel Time Tomography: Multi-Physics Simulations and Experimental Studies

Zheng,

Xu,

Xia

et al. 2024

Sensors

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Concrete-filled steel tube (CFST) members have been widely used in civil engineering due to their advanced mechanical properties. However, internal defects such as the concrete core voids and interface debonding in CFST structures are likely to weaken their load-carrying capacity and stiffness, which affects the safety and serviceability. Visualizing the inner defects of the concrete cores in CFST members is a critical requirement and a challenging task due to the obvious difference in the material mechanical parameters of the concrete core and steel tube in CFST members. In this study, a curved ray theory-based travel time tomography (TTT) with a least square iterative linear inversion algorithm is first introduced to quantitatively identify and visualize the sizes and positions of the concrete core voids in CFST members. Secondly, a numerical investigation of the influence of different parameters on the inversion algorithm for the defect imaging of CFST members, including the effects of the model weighting matrix, weighting factor and grid size on the void’s imaging quality and accuracy, is carried out. Finally, an experimental study on six CFST specimens with mimicked concrete core void defects is performed in a laboratory and the mimicked defects are visualized. The results demonstrate that TTT can identify the sizes and positions of the concrete core void defects in CFST members efficiently with the use of optimal parameters.

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Section: Introductionmentioning

confidence: 99%

A Concrete Core Void Imaging Approach and Parameter Analysis of Concrete-Filled Steel Tube Members Using Travel Time Tomography: Multi-Physics Simulations and Experimental Studies

Zheng,

Xu,

Xia

et al. 2024

Sensors

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“…Nevertheless, achieving high-accuracy tomographic results is crucial for the effective operation of health monitoring systems [7]. In the existing body of literature, SHM-based damage imaging methods frequently apply sparse piezoelectric sensor arrays [8][9][10][11][12]. Typically, a sparse array of piezoelectric transducers is either embedded within or mounted onto the structure, with one or several of these transducers acting as the excitation source of UGWs and the others acquiring the resulting propagated waves as signals.…”

Section: Introductionmentioning

confidence: 99%

Baseline-Free Damage Imaging of Composite Lap Joint via Parallel Array of Piezoelectric Sensors

Barzegar,

Ribeiro,

Pasadas

et al. 2023

Sensors

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This paper presents a baseline-free damage imaging technique using a parallel array of piezoelectric sensors and a control board that facilitates custom combinations of sensor selection. This technique incorporates an imaging algorithm that uses parallel beams for generation and reception of ultrasonic guided waves in a pitch–catch configuration. A baseline-free reconstruction algorithm for probabilistic inspection of defects (RAPID) algorithm is adopted. The proposed RAPID method replaces the conventional approach of using signal difference coefficients with the maximum signal envelope as a damage index, ensuring independence from baseline data. Additionally, conversely to the conventional RAPID algorithm which uses all possible sensor combinations, an innovative selection of combinations is proposed to mitigate attenuation effects. The proposed method is designed for the inspection of lap joints. Experimental measurements were carried out on a composite lap joint, which featured two dissimilar-sized disbonds positioned at the lap joint’s borderline. A 2D correlation coefficient was used to quantitatively determine the similarity between the obtained images and a reference image with correct defect shapes and locations. The results demonstrate the effectiveness of the proposed damage imaging method in detecting both defects. Additionally, parametric studies were conducted to illustrate how various parameters influence the accuracy of the obtained imaging results.

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Ultrasonic imaging of different shaped cracks in an isotropic plate by synthesizing time reversal and reverse time migration methods

Li¹,

Yang²,

Wu³

et al. 2023

Measurement

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Lamb wave tomography for defect localization using wideband dispersion reversal method

Cited by 8 publications

References 33 publications

A Concrete Core Void Imaging Approach and Parameter Analysis of Concrete-Filled Steel Tube Members Using Travel Time Tomography: Multi-Physics Simulations and Experimental Studies

A Concrete Core Void Imaging Approach and Parameter Analysis of Concrete-Filled Steel Tube Members Using Travel Time Tomography: Multi-Physics Simulations and Experimental Studies

Baseline-Free Damage Imaging of Composite Lap Joint via Parallel Array of Piezoelectric Sensors

Ultrasonic imaging of different shaped cracks in an isotropic plate by synthesizing time reversal and reverse time migration methods

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