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Effects of Uniaxial Stress on Magnetoacoustic Emission and Magnetoacoustic Responses in Steel

  • M. Namkung
  • W. T. Yost
  • D. Utrata
  • R. DeNale
  • P. W. Kushnick
  • J. L. Grainger
Chapter
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series

Abstract

Among the several unique phenomena observed during the irreversible domain wall motion in a ferromagnet, the Barkhausen and AE-type effects have been extensively studied due to their sensitivity to the material properties and residual stress state [1,2]. Between these two effects, the former is based on the abrupt motion of domain walls over pinning sites and the latter is based on the progressive rearrangement of domain structure following the magnetization process. A series of acoustic noise events, which occurs almost simultaneously with the magnetic Barkhausen noise, provides a separate methodology with unique capabilities and is the base of the magnetoacoustic emission (MAE) technqiue. The practical application of the ∆E-type effect to NDE residual stress measurement involves measuring ∆F(B)/F, fractional changes in frequency of phase-locked acoustic waves as a function of net magnetic induction, and the method has been called the low-field magnetoacoustic (MAC) technique by some of us [3].

Keywords

Domain Wall Stress Axis Compressive Residual Stress Uniaxial Stress Unstressed State 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • M. Namkung
    • 1
  • W. T. Yost
    • 1
  • D. Utrata
    • 2
  • R. DeNale
    • 3
  • P. W. Kushnick
    • 4
  • J. L. Grainger
    • 5
  1. 1.NASA Langley Research Center HamptonUSA
  2. 2.Association of American RailroadsChicagoUSA
  3. 3.David Taylor Research CenterAnnapolisUSA
  4. 4.PRC Kentron Inc.HamptonUSA
  5. 5.AS and M Inc.HamptonUSA

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