Eddy Current Residual Stress Profiling in Surface-Treated Engine Alloys

Abstract

Recent research results indicate that eddy current conductivity measurements can be exploited for nondestructive evaluation of subsurface residual stresses in surface-treated nickel-base superalloy components. According to this approach, the depth-dependent electric conductivity profile is calculated from the measured frequency-dependent apparent eddy current conductivity spectrum. Then, the residual stress depth profile is calculated from the conductivity profile based on the piezoresistivity coefficient of the material, which is determined separately from calibration measurements using the known external applied stresses. This paper reviews the basic principles, measurement procedures, advantages, and limitations of eddy current residual stress profiling.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2009
Accession Number
ADA515581

Entities

People

  • Bassam A. Abu-nabah
  • Mark P. Blodgett
  • Peter B. Nagy
  • Waled T. Hassan
  • Yu Feng

Organizations

  • University of Cincinnati

Tags

Communities of Interest

  • Advanced Electronics
  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Diffraction
  • Eddy Currents
  • Electrical Conductivity
  • Frequency
  • Heat Treatment
  • Laser Peening
  • Materials
  • Military Aircraft
  • Residual Stress
  • Shot Peening
  • Stresses
  • Surface Finishing
  • Surface Properties
  • Surface Roughness
  • Titanium Alloys
  • Transition Temperature

Fields of Study

  • Materials science

Readers

  • Plasma Physics.
  • Structural Health Monitoring of Composite Structures.
  • Wave Propagation and Nonlinear Chaotic Dynamics.