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Journal of Nondestructive Evaluation

, Volume 3, Issue 3, pp 125–136 | Cite as

On the optimum applied field for magnetic particle inspection using direct current

  • C. L. Oehl
  • L. J. Swartzendruber
Article

Abstract

Experimental measurements of leakage fields from cylindrical defects were obtained in a geometry which permitted simultaneous measurement of the magnetic induction of the material. The results obtained are compared with calculations using a nonlinear finite difference method. Both the experiments and the calculations indicate that the magnitude of the leakage field continues to grow nearly in proportion with the applied field well into the saturation region of the magnetic material. The implications for magnetic particle inspection are discussed.

Key words

magnetic particle inspection magnetic leakage fields finite difference method NDE 

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References

  1. 1.
    R.E. Beissner, G.A. Matzkanin, and C.M. Teller, NDE applications of magnetic leakage field methods, NTIAC-80-1, Southwest Research Institute, San Antonio, Texas (1980).Google Scholar
  2. 2.
    K.F. Bainton, Characterizing defects by determining magnetic leakage fields,NDT Int. 10(5):253–257 (1977).Google Scholar
  3. 3.
    L.J. Swartzendruber, Magnetic leakage and force fields for artificial defects in magnetic particle test rings, Proc. 12th Symp. NDE, NTIAC, San Antonio, Texas (1979), pp. 150–162.Google Scholar
  4. 4.
    W. Lord, J.M. Bridges, W. Yen, and R. Palanisamy, Residual and active leakage fields around defects in ferromagnetic materials,Mat. Eval. 36:47–52 (1978).Google Scholar
  5. 5.
    J.H. Hwang and W. Lord, Finite element modeling of magnetic field/defect interactions,ASTM J. Testing Eval. 3:21–25 (January 1975).Google Scholar
  6. 6.
    W. Lord and J.H. Hwang, Defect characterization from magnetic leakage fields,Br. J. NDT 19(1):14–18 (January 1977).Google Scholar
  7. 7.
    P.H. Francis and T.K. Moseley, A model for diagnosis of surface cracks by magnetic flux leakage,Br. J. NDT 21(2):162–168 (March 1979).Google Scholar
  8. 8.
    W.L. Ko and P.H. Francis, Magnetic leakage due to a surface crack,Br. J. NDT 17(5):141–144 (1975).Google Scholar
  9. 9.
    F. Foerster, Theoretische und Experimentelle Ergebnisse des Magnetischen Streuflussverfahrens,Materielpruefung 23(11):372–378 (November 1981).Google Scholar
  10. 10.
    R.E. Robichaud, Magnetic flux leakage of small defects in line pipe, TR72-50 (prepared for the Pipeline Research Committee of the American Gas Association), Automation Industries, Boulder, Colo. (1972).Google Scholar

Copyright information

© Plenum Publishing Corporation 1982

Authors and Affiliations

  • C. L. Oehl
    • 1
  • L. J. Swartzendruber
    • 1
  1. 1.National Measurement LaboratoryNational Bureau of StandardsWashington, DC

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