Three-dimensional reconstruction of surface-breaking flaws using finite element methods

Gladchtein, R. Schifini; Bruno, A. C.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p897
Academic Journal
We present an iterative algorithm that reconstructs the geometry of three-dimensional surface-breaking flaws from measurements using an NDE magnetic flux leakage technique. Several surface-breaking flaws in a ferromagnetic sample have been modeled using the finite element method and later reconstructed by an optimization routine. This reconstruction was achieved by modifying the coordinates of several surface nodes of the finite element mesh, solving the magnetostatic problem, and optimizing it by a least-squares method. The magnetic field was measured above the surface of the sample. This inverse solution algorithm might be particularly useful to characterize flaws detected by magnetic in-line inspection tools in oil and gas pipelines. © 2000 American Institute of Physics.


Related Articles

  • Magnetic field computation in hysteretic media by the finite element method, using the Preisach model. Ostiguy, J.-F.; Silvester, P. P. // Journal of Applied Physics;4/15/1985, Vol. 57 Issue 8, p3853 

    Presents a study on magnetic field computation in hysteretic media by the finite element method using the Preisach model. Introduction to the finite element method; Derivation of equations; Details of the implementation of the Preisach model; Conclusion.

  • The strategic dual image method: An extremely simple procedure for open field problems. Saito, Y.; Takahashi, K.; Hayano, S. // Journal of Applied Physics;4/15/1988, Vol. 63 Issue 8, p3366 

    Discusses the relationship between strategic dual image and traditional electric image methods for the finite element solution of open boundary problems. Value of the net magnetic field source in the problem region of the strategic dual image method; Use of first-order triangular finite...

  • New vector finite elements for three-dimensional magnetic field computation. Barton, M. L.; Cendes, Z. J. // Journal of Applied Physics;4/15/1987, Vol. 61 Issue 8, p3919 

    Presents information on a study which addressed the three-dimensional magnetic field problems using vector finite-element approximation function. Interface between different materials of permeabilities; Results and discussion; Conclusions.

  • New nonlinear algorithms for finite element analysis of 2D and 3D magnetic fields. Brauer, J. R.; Larkin, L. A.; MacNeal, B. E.; Ruehl, J. J. // Journal of Applied Physics;4/15/1991, Vol. 69 Issue 8, p5044 

    Presents a nonlinear algorithms for finite element analysis of two-dimensional and three-dimensional magnetic fields. Success of algorithm in finite element analysis; Mathematical model for nonlinear excitation vector; Comparative results of new and old methods.

  • Optimization of semiconductor–metal hybrid structures for application in magnetic-field sensors and read heads. Holz, Matthias; Kronenwerth, Oliver; Grundler, Dirk // Applied Physics Letters;10/20/2003, Vol. 83 Issue 16, p3344 

    Semiconductor–metal hybrid structures can exhibit a very large geometrical magnetoresistance effect, the so-called extraordinary magnetoresistance (EMR) effect. Using the finite element method, we study the EMR effect in rectangular semiconductor–metal hybrid structures and...

  • Finite element method for stationary and static electromagnetic fields. Lager, Ioan Ernest; Mur, Gerrit // Journal of Applied Physics;4/16/1997, Vol. 81 Issue 8, p4079 

    Describes a finite element method for computing static and stationary electric and magnetic fields directly in terms of the electric and magnetic field strength. Conditions of interfaces between different media and on the outer boundary.

  • A coupled field finite element for magnetostructural analysis. Ostergaard, Dale F. // Journal of Applied Physics;4/15/1988, Vol. 63 Issue 8, p3185 

    Focuses on a study which presented a finite element formulation for two-dimensional planar and axisymmetric application that directly couples magnetomechanical interaction. Review of the finite element matrix equations used for magnetic field analysis and structural analysis; Examples and...

  • Stabilized finite element formulation applied to the kinematic Ponomarenko dynamo problem. Touihri, Ridha; Soulaimani, Azzeddine; Plunian, Franck // Theoretical & Computational Fluid Dynamics;Nov2009, Vol. 23 Issue 6, p431 

    A stabilized finite element ( B, q) formulation is developed to solve the kinematic dynamo problem. As a test case, we solve the induction equation for a given solid body helical flow, embedded in a cylindrical conducting shell. This problem corresponds to the well-known Ponomarenko dynamo. It...

  • Two-dimensional analytical field model of an inset permanent-magnet synchronous machine. De la Barri�re, O.; Ben Ahmed, H.; Gabsi, M.; Lo Bue, M. // Electromotion;Apr-Jun2010, Vol. 17 Issue 2, p81 

    In this paper, an analytical method for the calculation of the electromagnetic field in the airgap of a permanent-magnet synchronous machine is developed, so as to compute the torque of the machine. Such a work is applicable to different machine topologies (even for salient rotor ones), when a...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics