Advanced Quantitative Magnetic Nondestructive Evaluation Methods — Theory and Experiment

  • J. R. Barton
  • F. N. Kusenberger
  • R. E. Beissner
  • G. A. Matzkanin
Part of the Sagamore Army Materials Research Conference Proceedings book series (SAMC, volume 23)

Abstract

The scale of fatigue crack phenomena is reviewed in relation to the size detection capabilities of nondestructive evaluation methods. Several features of the fatigue phenomena which should be considered in developing nondestructive characteriziation methods are tabulated and briefly discussed. A qualitative assessment of such factors in relation to the inspection of ball and roller bearing components suggested that magnetic methods were very promising. The basis of the magnetic methods is magnetic domain phenomena and several aspects are briefly reviewed, including interaction of domains and inclusions and the influence of stress and magnetic field on domains. While magnetic calculations from first principles are extremely complicated when applied to engineering specimens, simplified treatments have been developed and will be reviewed. Experimental results will also be described which indicate that in many instances the simplified calculations can be used to predict many features of the experimental results. A cursory comparison of results predicted by the simple analytic model and other models in which finite element computer analysis predictions have been made do not agree for certain features. Experimental results and analyses obtained on rod-type fatigue specimens which show the experimental magnetic measurements in relation to featues such as crack opening displacement, crack opening volume, crack depth and other features show much promise in providing methods for greatly improved characterization of cracks in relation to fracture mechanics analyses and life prediction.

Keywords

Permeability Fatigue Nickel Bark Electromagnetism 

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Copyright information

© Plenum Press, New York 1979

Authors and Affiliations

  • J. R. Barton
    • 1
  • F. N. Kusenberger
    • 1
  • R. E. Beissner
    • 1
  • G. A. Matzkanin
    • 1
  1. 1.Southwest Research InstituteSan AntonioUSA

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