The measurement of residual stresses by laser annealing and electronic speckle pattern interferometry has been successful for moderate to high stress levels. However, for lower stress levels, say less than 80% of yield, submicrometer deformations are encountered that result in subfringe interferograms. Subfringe measurements are not a serious problem with modern optical procedures such as phase shifting interferometry. However, such subfringes are comparable to noise levels resulting from air turbulence, environmental thermal variations, and so forth. Stress relief from local heating is also subject to theoretical lower stress limits that result from the competing effect of thermal expansion in the case of tensile stresses. Thus, for both practical and fundamental reasons the technique was modified such that several fringes will result at lower stress levels. These experimental techniques are shown to substantially expand the stress measurement range for this technique.
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August 2002
Technical Papers
Enhanced Measurement of Residual Stress by Speckle Correlation Interferometry and Local Heat Treating for Low Stress Levels
Martin J. Pechersky, Advisory Engineer,,
Martin J. Pechersky, Advisory Engineer,
Westinghouse Savannah River Company, Aiken, SC 29808
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Chandra S. Vikram, Research Professor,
Chandra S. Vikram, Research Professor,
The University of Alabama, Huntsville, AL 35899
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Martin J. Pechersky, Advisory Engineer,
Westinghouse Savannah River Company, Aiken, SC 29808
Chandra S. Vikram, Research Professor,
The University of Alabama, Huntsville, AL 35899
Contributed by the Pressure Vessels and Piping Division and presented at the Pressure Vessels and Piping Conference, Atlanta, Georgia, July 22–26, 2001, of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS. Manuscript received by the PVP Division, December 7, 2000; revised manuscript received, March 29, 2001. Associate Editor: S. Y. Zamrik.
J. Pressure Vessel Technol. Aug 2002, 124(3): 371-374 (4 pages)
Published Online: July 26, 2002
Article history
Received:
December 7, 2000
Revised:
March 29, 2001
Online:
July 26, 2002
Citation
Pechersky, M. J., and Vikram, C. S. (July 26, 2002). "Enhanced Measurement of Residual Stress by Speckle Correlation Interferometry and Local Heat Treating for Low Stress Levels ." ASME. J. Pressure Vessel Technol. August 2002; 124(3): 371–374. https://doi.org/10.1115/1.1482086
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