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Inference of Fatigue Crack Closure Stresses from Ultrasonic Transmission Measurements

  • R. G. Thompson
  • C. J. Fiedler
  • O. Buck

Abstract

The nondestructive determination of stress is usually attempted by measuring stress (or strain) related changes in material properties. Included are direct x-ray measurements of lattice constants and indirect inferences of stress or strain from changes in ultrasonic velocities or magnetic properties. However, in problems in which one wishes to determine localized stresses across an interface between two materials, neither approach is satisfactory. X-rays typically measure surface stresses and do not sample the stress condition near an internal interface. Ultrasonic velocity measurements and magnetic measurements can sense interior conditions, but also average over the properties of the intervening material. Hence, they cannot determine the localized stresses at the interface without sophisticated data reduction techniques such as those employed in holographic reconstructions.

Keywords

Fatigue Crack Crack Closure Ultrasonic Velocity Closure Stress Ultrasonic Transmission 
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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Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • R. G. Thompson
    • 1
  • C. J. Fiedler
    • 1
  • O. Buck
    • 1
  1. 1.Ames LaboratoryIowa State UniversityAmesUSA

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