Residual Leakage Field Modeling

  • Y. S. Sun
  • S. S. Udpa
  • W. Lord
Conference paper
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series (RPQN, volume 6 A)

Abstract

Residual leakage fields are set up around defects in ferromagnetic materials after the active source of d. c. excitation has been removed [1]. Defect detection and characterization then occur by using any flux density sensitive transducer such as magnetic particles, magnetic tape, a moving coil or a Hall element [2]. Past analytical attempts at modeling these phenomena have largely been based on representing simple defect shapes by an equivalent dipole or magnetic charge distribution [3]. In order to examine the effects of realistic defect shapes and material B/H properties, finite element analysis techniques have been used [4,5] to model both active and residual leakage field effects. This paper discusses alternative B/H representations and their impact on the numerical modeling of defect residual leakage fields.

Keywords

Permeability Resi Cote 

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References

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    W. Lord, Applications of Numerical Field Modeling to Electromagnetic Methods of Nondestructive Testing, IEEE Trans. Mag. 19, 2437 (1983).CrossRefGoogle Scholar
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Copyright information

© Springer Science+Business Media New York 1987

Authors and Affiliations

  • Y. S. Sun
    • 1
    • 2
  • S. S. Udpa
    • 1
  • W. Lord
    • 1
  1. 1.Electrical Engineering DepartmentColorado State UniversityFort CollinsUSA
  2. 2.Nanjing Aeronautical InstituteChina

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