Estimation of sizes of cracks on pipes in nuclear power plants using dipole moment and finite element methods

Le, Minhhuy; Lee, Jinyi; Jun, Jongwoo; Kim, Jungmin

doi:10.1016/j.ndteint.2013.04.008

Cited by 27 publications

(17 citation statements)

References 14 publications

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“…This properties is also exhibite strengthen the Hermite-Gaussi [19,20,25]. pose, it is sufficient to know that mials which are the solution of a oblem [24].…”

Section: Hermite-gaussian Hypothesismentioning

confidence: 88%

Fast 2D crack profile reconstruction by image processing for Eddy-Current Testing

Betta

Ferrigno

Laracca

et al. 2015

2015 IEEE Metrology for Aerospace (MetroAeroSpace)

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Fast reconstruction of defects geometry is one of the main goal of Eddy Current Non-destructive testing. The information about the type of defects, their shapes, orientations and geometrical characteristics is of great importance in evaluating the impact of defects on structures' integrity and operation safety. From one point of view, the knowledge of the defect shape could give important information about the manufacturing, the use or the cause that have stressed the specimen and generated the defect, and from the other point of view the reconstruction of geometrical parameters of defect could be made easier if the shape of the defect is known. Although many inverse procedures have been developed for Eddy Current Testing, usually high-computational time and resources are requested, hampering the application of 3D reconstruction methods in on-line or in-situ inspections. In this paper a fast 2D defect profile reconstruction technique is presented based on image processing. The main idea of the proposed method is that images obtained from the maps of magnetic field on specimen with flaws, express a trend attributable to a class of known functions. In particular, the shape of the obtained image depends on both the type of defect that the type of measurement probe adopted. Then using a suitable reference image related to the response of the probe as a digital filter to process the acquired image through deconvolution or correlation operations, the shape of the flaw that has generated the image can be retrieved.

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“…This properties is also exhibite strengthen the Hermite-Gaussi [19,20,25]. pose, it is sufficient to know that mials which are the solution of a oblem [24].…”

Section: Hermite-gaussian Hypothesismentioning

confidence: 88%

Fast 2D crack profile reconstruction by image processing for Eddy-Current Testing

Betta

Ferrigno

Laracca

et al. 2015

2015 IEEE Metrology for Aerospace (MetroAeroSpace)

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“…Recently developed DM electromagnetic testing methods have allowed for faster simulation and easier implementation than is possible with the FEM . In this study, we apply the DM model to simulate the scanning of the distribution of alternating magnetic fields around cracks in a pipe; in particular, the OD, complicated OD (COD), and ID cracks are studied.…”

Section: Principle and Algorithmmentioning

confidence: 99%

“…Aided by a linear guide motor, the bobbin sensor positioned inside the pipe can scan the entire pipe, as shown in Figure 1, and the distribution of magnetic fields around the cracks can be measured and displayed by the computer at high speed. Recently developed DM electromagnetic testing methods have allowed for faster simulation and easier implementation than is possible with the FEM [16][17][18]. In this study, we apply the DM model to simulate the scanning of the distribution of alternating magnetic fields around cracks in a pipe; in particular, the OD, complicated OD (COD), and ID cracks are studied.…”

Section: Principle and Algorithmmentioning

confidence: 99%

Fast simulation of alternating magnetic fields around a crack in a pipeline system using a dipole model method

Kim

et al. 2014

Int J Numerical Modelling

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This study proposes a method for the fast simulation of the distribution of alternating magnetic fields around internal cracks as well as cracks on the inner and outer diameter surfaces of a pipe. This method, which uses a bobbin‐type magnetic camera to inspect cracks in small‐bore piping systems, is based on a dipole model, allowing for the rapid calculation and storage of data on the distribution of alternating magnetic fields around cracks from a sensor moving inside a pipe. Copyright © 2014 John Wiley & Sons, Ltd.

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“…The basic principle of the MFL is that a specimen under inspection is magnetized near saturation under the applied magnetic field. If there is no defect on the specimen, the majority of the magnetic flux lines pass through the specimen material itself, in contrast, the leakage field is created due to the smaller permeability in the defect region [1]- [4]. Three major vector components of the leakage profile are radial, axial, and tangential.…”

Section: Introductionmentioning

confidence: 99%

“…Distorted eddy current in the defect region generates the alternating magnetic field in the radial direction of the pipeline. Volumetric studies are performed to validate the analytical model along with the finite element method and experimental method [4]. Analytical model for the radial component of the leakage profile is proposed and lift-off study is also performed.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of the Rectangular Defect Orientation using Magnetic Flux Leakage

Alaric

Suresh²,

Abudhahir

et al. 2018

Measurement Science Review

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This paper presents an approach to estimate the orientation of the rectangular defect in the ferromagnetic specimen using the magnetic flux leakage technique. Three components of the magnetic flux leakage profile, such as radial, axial, and tangential component are considered to estimate the orientation of the rectangular defect. The orientation of the rectangular defect is estimated by the proposed analytical model using MATLAB software. The results calculated by the analytical model are validated by the three-dimensional finite element analysis using COMSOL Multiphysics software. Tangential component provides better performance to estimate the orientation of the rectangular defect compared with radial and axial component of the magnetic flux leakage profile.

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Estimation of sizes of cracks on pipes in nuclear power plants using dipole moment and finite element methods

Cited by 27 publications

References 14 publications

Fast 2D crack profile reconstruction by image processing for Eddy-Current Testing

Fast 2D crack profile reconstruction by image processing for Eddy-Current Testing

Fast simulation of alternating magnetic fields around a crack in a pipeline system using a dipole model method

Theoretical Analysis of the Rectangular Defect Orientation using Magnetic Flux Leakage

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