Model-based simulation of focused beam fields produced by a phased array ultrasonic transducer in dissimilar metal welds

Ye, Jing; Kim, Hak-Joon; Song, Sung‐Jin; Kang, Sung-Sik; Kim, Kyung-Cho; Song, Minkyu

doi:10.1016/j.ndteint.2011.01.003

Cited by 34 publications

(11 citation statements)

References 13 publications

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“…To simulate the ultrasonic wave propagation behavior, it is necessary to model the distribution of the grain orientation, which is the macroscopic pattern of the grain orientation in austenitic welds. For the simulation, grain orientation obtained from micrographs can generally be used [3,5,9]. In a previous study, the authors proposed a grain orientation prediction methodology based on computational mechanics and an optimization technique [5].…”

Section: Distribution Of Grain Orientationmentioning

confidence: 99%

“…In the austenitic weldment, the material properties along the welding pass (y-axis) were assumed to be isotropic; however, in the other directions, to be anisotropic [9,10]. The material behavior can be properly simulated well with a transversely isotropic material, for which the elastic constants are expressed as follows:…”

Section: Anisotropic Elastic Constantsmentioning

confidence: 99%

“…As a result, many studies have been conducted to determine the distribution of grain orientation [1,3,5] and the elastic constants [6][7][8] in austenitic welds. In addition, several studies have applied ultrasonic array data to NDEs for austenitic welds [3,6,[9][10][11][12][13][14][15][16][17]. However, there is no reliable and practical ultrasonic imaging method that can be applied to defects in austenitic welds.…”

Section: Introductionmentioning

confidence: 99%

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FEA-Based Ultrasonic Focusing Method in Anisotropic Media for Phased Array Systems

et al. 2021

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Traditional ultrasonic imaging methods have a low accuracy in the localization of defects in austenitic welds because the anisotropy and inhomogeneity of the welds cause distortion of the ultrasonic wave propagation paths in anisotropic media. The distribution of the grain orientation in the welds influences the ultrasonic wave velocity and ultrasonic wave propagation paths. To overcome this issue, a finite element analysis (FEA)-based ultrasonic imaging methodology for austenitic welds is proposed in this study. The proposed ultrasonic imaging method uses a wave propagation database to synthetically focus the inter-element signal recorded with a phased array system using a delay-and-sum strategy. The wave propagation database was constructed using FEA considering the grain orientation distribution and the anisotropic elastic constants in the welds. The grain orientation was extracted from a macrograph obtained from a dissimilar metal weld specimen, after which the elastic constants were optimized using FEA with grain orientation information. FEA was performed to calculate a full matrix of time-domain signals for all combinations of the transmitting and receiving elements in the phased array system. The proposed approach was assessed for an FEA-based simulated model embedded in a defect. The simulation results proved that the newly proposed ultrasonic imaging method can be used for defect localization in austenitic welds.

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Section: Distribution Of Grain Orientationmentioning

confidence: 99%

Section: Anisotropic Elastic Constantsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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FEA-Based Ultrasonic Focusing Method in Anisotropic Media for Phased Array Systems

et al. 2021

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“…In other words, there is a beam-distortion phenomenon that occurs during defect inspection using the ultrasonic technique. This distortion is caused by the granular crystal grain size, the complex grain size, the local orientation, and the interface of the weld [12][13][14][15]. In addition to these weld characteristics, more inaccurate assessments are caused in detecting defects in the buttering layer in DMWs as applied to nuclear power plants.…”

Section: Introductionmentioning

confidence: 99%

Propagation and Attenuation Characteristics of an Ultrasonic Beam in Dissimilar-Metal Welds

Hwang

Sung

Kim

et al. 2020

Sensors

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Ultrasonic inspection of welds joining dissimilar metals in nuclear power plants has proven to be a challenge, because the ultrasonic waves are subject to diffraction, distortion, scattering, and noise. These perturbations are due to their interactions with coarse-grained microstructures having anisotropic and heterogeneous metallurgical properties that can promote ultrasonic attenuation. In this paper, to improve the reliability of ultrasonic testing for dissimilar-metal welds (DMWs), ultrasonic beam characteristics for DMWs with a buttering layer were investigated in order to analyze the beam distortion phenomenon caused by inhomogeneous anisotropic properties and coarse grains. Ultrasonic testing was performed on DMW specimens using single ultrasonic transducers to investigate the behavior of the ultrasonic beam in the welds. According to the anisotropic and heterogeneous properties, when passing through the weld and the buttering layer of the DMW, ultrasonic waves were distorted and attenuation was high. In particular, in the case of using angular incidence that passed through the weld and the buttering layer in turn, the received ultrasonic data did not contain accurate internal information. From this, it was verified that internal defects may be detected by transmitting ultrasonic waves in different directions. Finally, the existing limitations on the application of non-destructive ultrasonic testing to dissimilar-metal welds were verified, and a solution to the measurement method was proposed.

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“…The acoustic phased array has been applied to the nondestructive testing of solid materials [1,2], medical inspection [3], under-water acoustic measurement [4], and nondestructive inspection for underwater structure using variable focusing control with phase shifts [5]. In the design of acoustic phased array, it is necessary to predict the sound pressure field emitted from the acoustic phased array for various phase shifts.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear sound propagation on acoustic phased array

Fujisawa

Asada

2015

Applied Acoustics

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Model-based simulation of focused beam fields produced by a phased array ultrasonic transducer in dissimilar metal welds

Cited by 34 publications

References 13 publications

FEA-Based Ultrasonic Focusing Method in Anisotropic Media for Phased Array Systems

FEA-Based Ultrasonic Focusing Method in Anisotropic Media for Phased Array Systems

Propagation and Attenuation Characteristics of an Ultrasonic Beam in Dissimilar-Metal Welds

Nonlinear sound propagation on acoustic phased array

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