Enhanced ultrasonic total focusing imaging of CFRP corner with ray theory-based homogenization technique

Luo, Zhongbing; KANG, Jinli; Cao, Hongtao; Liu, Lin

doi:10.1016/j.cja.2022.09.010

Cited by 9 publications

(2 citation statements)

References 19 publications

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“…As a consequence of the complexity of the velocity profile for multidirectional CFRP laminate [ 14 ], prior studies generally simplified it to unidirectional CFRP material [ 15 ]. In order to measure the change in angle-dependent velocity of unidirectional CFRP material with increasing propagation angle, some measurement methods with single-sided access have been proposed as follows.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Phased Array Imaging Approach Using Omni-Directional Velocity Correction for Quantitative Evaluation of Delamination in Composite Structure

Fan

Chen

et al. 2023

Sensors

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The ultrasonic detectability of buried defects within composite materials is dependent on the anisotropy of the composite material by which the propagation property of acoustic wave in each direction is variably affected. In this study, the characteristics of acoustic waves propagating in different directions for composite materials are explored based on the full matrix capture (FMC) data using an ultrasonic phased array. The elastic constant of multidirectional carbon fiber reinforced plastic (CFRP) laminate is first derived based on the genetic algorithm. The characteristics of transmitted and reflected waves in higher angles are predicted by implementing the Christoffel equation, and the focal law used in post-processing of FMC data can be optimized accordingly. The imaging results of the total focusing method (TFM) using the improved focal law are compared with the results of the conventional TFM. The results suggest that the optimized TFM can effectively characterize the defect by reducing the background noise. Furthermore, since it is impractical to theoretically correct angle-dependent velocity for in situ inspection, a linear extrapolation method based on the experimentally measurable velocity at low angles is proposed to estimate the velocity profile at higher angles. The imaging results using the fast extrapolated velocity profile is then compared with the theoretical, and it has been demonstrated that while the difference between the images using the theoretical focal law and the linearly extrapolated one is barely visible, the later one is overwhelmingly advantageous to be realiszd for engineering practices.

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Section: Introductionmentioning

confidence: 99%

Ultrasonic Phased Array Imaging Approach Using Omni-Directional Velocity Correction for Quantitative Evaluation of Delamination in Composite Structure

Fan

Chen

et al. 2023

Sensors

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show abstract

“…With computers emerging there appeared the possibility to realize complex computations, providing complex algorithms to manipulate multi-element acoustic arrays. The most widespread method is the total focusing method (TFM), named the "Golden Standard", as well as its modifications [2][3][4][5][6][7][8][9][10][11][12]. In the majority of industries such as aviation, aerospace and nuclear, the ultrasonic testing of products is very often performed with direct contact or with the application of a prism which is located between the acoustic array and the object under inspection.…”

Section: Introductionmentioning

confidence: 99%

Studies of Angular Resolution for Acoustic Arc Arrays

Sednev

Soldatov

Kostina

et al. 2023

Sensors

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Currently, phased arrays are increasingly used in ultrasonic nondestructive testing. One of the most important parameters of ultrasonic nondestructive testing with the application of phased arrays is the angular resolution. This paper presents the results of studies of the angular resolution of concave and convex acoustic arrays in ultrasonic testing with the application of the total focusing method. Computer modeling of concave and convex acoustic arrays consisting of 16, 32 and 64 elements with distances between elements of 0.5 and 1 mm and arc radii of 30 and 60 mm have been performed. The results obtained by computer modeling were confirmed via in situ experiments.

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Defects Imaging in Corner Part with Surface Adaptive Ultrasonic and Focusing in Receiving (FiR) Strategy

Luo,

Liu,

et al. 2024

J Nondestruct Eval

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Enhanced ultrasonic total focusing imaging of CFRP corner with ray theory-based homogenization technique

Cited by 9 publications

References 19 publications

Ultrasonic Phased Array Imaging Approach Using Omni-Directional Velocity Correction for Quantitative Evaluation of Delamination in Composite Structure

Ultrasonic Phased Array Imaging Approach Using Omni-Directional Velocity Correction for Quantitative Evaluation of Delamination in Composite Structure

Studies of Angular Resolution for Acoustic Arc Arrays

Defects Imaging in Corner Part with Surface Adaptive Ultrasonic and Focusing in Receiving (FiR) Strategy

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