In-Situ Stress Measurement with the Canmet Portable X-Ray Stress Diffractometer

  • R. A. Holt
  • M. Brauss
  • J. Boag


A new instalment has been developed to measure in-situ residual or applied stresses by X-ray diffraction. The instrument has the capability to conpensate for texture gradients or coarse grain size, to operate in both single- and multiple exposure modes, to determine surface stress tensors without repositioning and to examine diffraction lines wider than the detector aperture. Laboratory tests on ferritic steels show the instrument to be capable of a standard deviation of 14.6 MPa in the single exposure mode and 5.8 MPa in the multiple exposure mode. The diffractometer was used to measure stress near welds in the Deaerator Storage Tank in Ontario Hydro’s Lakeview Thermal Generating Station (T.G.S.) — Unit #7 at Mississauga, Ontario. Large compressive residual stresses were found parallel and perpendicular to the welds by single- and multiple exposure techniques.


Bragg Reflection Ferritic Steel Texture Gradient Grit Blasting Stress Corrosion Cracking 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    B.D. Cullity, “The Elements of X-ray Diffraction” 2nd Edition, Addison-Wesley, Reading Mass., 1978.Google Scholar
  2. 2.
    M. James and J.B. Cohen, “PARS — A Portable X-ray Analyser for Residual Stress”, Journal of Testing and Evaluation, Vol. 6(1978), pp 91–97(See also U.S. patent #4095103).CrossRefGoogle Scholar
  3. 3.
    C.O. Ruud, “X-ray Analysis and Advances in Field Instrumentation”, Journal of Metals, Vol.13, No.6(1979), pp 10–15.Google Scholar
  4. 4.
    L. Castex, J.M. Sprauel and M. Barrai, “A New, In-Situ, Automatic Strain Measuring X-ray Diffraction Apparatus with PSD”, Advances in X-ray Analysis, Vol.27(1984), pp 267–272.CrossRefGoogle Scholar
  5. 5.
    C.M. Mitchell, “The CANMET Portable Stress Diffractometer”, Proc. International Conference on Pipeline Steels, Edmonton, Alberta (1983) Gov’t of Canada Publishing Centre, Ottawa(See also U.S. Patent # 4561062)Google Scholar
  6. 6.
    R.A. Holt “A Comprehensive Approach to In-Situ Stress Measurement”, Advances in X-ray Analysis, Vol.29(1986), pp 29–35.Google Scholar
  7. 7.
    G. Maeder, J.L. Lebrun and J.M. Sprauel, “Present Possibilities for the X-ray Diffraction Method of Stress measurement”, N.D.T. International, October 1981, pp 235–247.Google Scholar
  8. 8.
    J.T. Norton “X-ray Stress Measurement by the Single Exposure Technique”, Advances in X-ray Analysis, Vol.11(1968), pp 401–410.CrossRefGoogle Scholar
  9. 9.
    C.M. Mitchell, “A Dual Detector Diffractometer for Measurement of Residual Stress”, Advances in x-ray Analysis, Vol. 20(1977), pp 379–391.CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • R. A. Holt
    • 1
  • M. Brauss
    • 2
  • J. Boag
    • 3
  1. 1.CANMET, Energy Mines and ResourcesOttawaCanada
  2. 2.PROTO Mfg. Ltd.WindsorCanada
  3. 3.Ontario Hydro Research DivisionTorontoCanada

Personalised recommendations