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Nicola Owle - One of the best experts on this subject based on the ideXlab platform.

  • evaluation of the Magnetic field near a crack with application to Magnetic Particle Inspection
    Journal of Physics D, 2002
    Co-Authors: J R Owle, Nicola Owle
    Abstract:

    In this paper, the Magnetic field at the mouth of a crack in ferroMagnetic steel is determined by means of a two-dimensional, linear model. The solution is found by employing an analytical method in which one complex variable is transformed into another by means of a mapping function. An approximate boundary condition, based on the fact that the steel permeability is much larger than that of free space, is used. In this way, three representations of a crack are treated: narrow and open cracks and a semi-elliptical indentation. The mapping function transforms these shapes into a half-plane geometry for which the solution is easily obtained. The advantage of this analytical approach is that the results are readily accessible without the need for a large numerical code. Example calculations are compared with each other and with calculations based on a former theory. This work has application in electroMagnetic non-destructive evaluations: eddy-current testing, flux leakage measurements and, most directly, Magnetic Particle Inspection.

Henrique E Toma - One of the best experts on this subject based on the ideXlab platform.

L J H Asche - One of the best experts on this subject based on the ideXlab platform.

  • review of progress in Magnetic Particle Inspection
    40TH ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: Incorporating the 10th International Conference on Barkhausen Noise and Micr, 2014
    Co-Authors: David J Eisenma, Darrel Enya, L J H Asche
    Abstract:

    Magnetic Particle Inspection (MPI) has been widely utilized for decades, and sees considerable use in the aerospace industry with a majority of the steel parts being inspected with MPI at some point in the lifecycle. Typical aircraft locations inspected are landing gear, engine components, attachment hardware, and doors. In spite of its numerous applications the method remains poorly understood, and there are many aspects of that method which would benefit from in-depth study. This shortcoming is due to the fact that MPI combines the complicated nature of electroMagnetics, metallurgical material effects, fluid-Particle motion dynamics, and physiological human factors into a single Inspection. To promote understanding of the intricate method issues that affect sensitivity, or to assist with the revision of industry specifications and standards, research studies will be prioritized through the guidance of a panel of industry experts, using an approach which has worked successfully in the past to guide fluor...

  • analytical approach to simulation of Magnetic Particle Inspection of defects with various shapes and sizes
    REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, 2005
    Co-Authors: Yevge Melikhov, S J Lee, David Jiles, M Garto, R Lopez, L J H Asche
    Abstract:

    In this work we studied the influence of a various surface defects on results of Magnetic Particle Inspection (MPI). Test materials for an MPI simulation were assumed to have isotropic constant permeability. In order to generate Magnetic flux leakage signals from different surface cracks of various shapes and sizes, we used both analytical approach and numerical approach based on the finite element method. Varying the dimensions of a defect, the Magnetic field gradient and the Magnetic force on Magnetic Particles were computed. The amount of the retained Magnetic Particles due to the defect can be estimated from the Magnetic force. The simulated results can be used to assist in understanding of the results of experimental MPI.

  • generic algorithm of Magnetic Particle Inspection using finite element modeling
    Quantitative Nondestructive Evaluation, 2004
    Co-Authors: J Y Lee, S J Lee, David Jiles, M Garto, R Lopez, Yevge Melikhov, L J H Asche
    Abstract:

    Magnetic Particle Inspection (MPI) is a widely used nondestructive Inspection method for aerospace applications essentially limited to experiment‐based approaches. The analysis of MPI characteristics that affect sensitivity and reliability contributes not only reductions in Inspection design cost and time but also improvement of analysis of experimental data. The material is assumed to have isotropic ferroMagnetic properties in this research. The objective of this research is to develop a software package on the use of the finite element method (FEM) for Magnetic Particle Inspection simulations with reversible nonlinear permeability of materials in order to give numerical simulations of MPI for defects with various sizes. We employed an FEM for numerical calculations because this is known to be suitable for complicated geometric objects such as the part shapes encountered in aviation components and defects of concern. The Magnetic field gradient and Magnetic force at the sites of defects having different ...

  • sensitivity analysis of simulations for Magnetic Particle Inspection using the finite element method
    IEEE Transactions on Magnetics, 2003
    Co-Authors: J Y Lee, S J Lee, David Jiles, M Garto, R Lopez, L J H Asche
    Abstract:

    Magnetic Particle Inspection (MPI) is widely used for nondestructive evaluation in aerospace applications in which interpretation of Inspection results is currently limited to empirical knowledge and experience-based approaches. Advances in computational Magnetics, particularly the use of finite-element calculations, have enabled realistic numerical simulations of Magnetic Particle Inspection to be undertaken with complicated geometries. In this paper, we report a sensitivity analysis using finite-element-method simulations of Magnetic Particle Inspection for defects with various sizes and geometries. As a result, improved quantitative understanding of the MPI technique and factors that affects its sensitivity and reliability has been achieved. These results can be used to optimize conditions for conducting these Inspections and should lead to improvement in analysis and interpretation of experimental results.

  • development of modeling and simulation for Magnetic Particle Inspection using finite elements
    Other Information: TH: Thesis (M.S.); Submitted to Iowa State Univ. Ames IA (US), 2003
    Co-Authors: J Y Lee, S J Lee, David Jiles, M Garto, R Lopez, L J H Asche
    Abstract:

    Magnetic Particle Inspection (MPI) is a widely used Inspection method for aerospace applications with Inspection development essentially limited to empirical knowledge and experience‐based approaches. Better quantitative understanding of the MPI technique and factors that affect its sensitivity and reliability would contribute not only to reductions in Inspection design cost and time but also improvement of analysis of experimental data. We employed a finite element method (FEM) for numerical calculation because this is known to be suitable for complicated geometric objects such as the part shapes encountered in aviation components and defects of concern. Magnetic Particles are usually soft Magnetic materials and sensitive to the Magnetic field distribution around them. They are easily attracted toward a high Magnetic field gradient. Selection of Magnetic field source, which produces a Magnetic field gradient large enough to detect a small defect in the sample, is an important factor in Magnetic Particle ...

J R Owle - One of the best experts on this subject based on the ideXlab platform.

  • evaluation of the Magnetic field near a crack with application to Magnetic Particle Inspection
    Journal of Physics D, 2002
    Co-Authors: J R Owle, Nicola Owle
    Abstract:

    In this paper, the Magnetic field at the mouth of a crack in ferroMagnetic steel is determined by means of a two-dimensional, linear model. The solution is found by employing an analytical method in which one complex variable is transformed into another by means of a mapping function. An approximate boundary condition, based on the fact that the steel permeability is much larger than that of free space, is used. In this way, three representations of a crack are treated: narrow and open cracks and a semi-elliptical indentation. The mapping function transforms these shapes into a half-plane geometry for which the solution is easily obtained. The advantage of this analytical approach is that the results are readily accessible without the need for a large numerical code. Example calculations are compared with each other and with calculations based on a former theory. This work has application in electroMagnetic non-destructive evaluations: eddy-current testing, flux leakage measurements and, most directly, Magnetic Particle Inspection.

Fernando Menegatti De Melo - One of the best experts on this subject based on the ideXlab platform.