The strain gauge rosette hole drilling method is often used for determining residual stresses versus depth to depths on the order of 0.5–1.5 mm. Frequently, it is of interest to find stress profiles to greater depths. To provide such a capability, a new approach is presented. Residual stresses versus depth are found by drilling a small diameter hole incrementally to a depth of half of its diameter. The profile of stresses versus depth is found from changes in surface displacements associated with the stress relief from introducing the hole, observed by optical means. Next, a larger diameter, square-bottomed hole is milled directly over the small hole to a depth equaling that of the smaller diameter hole. The bottom of the larger hole provides a fresh surface for optical observation and incremental drilling of a new small hole. This procedure is repeated until a desired total depth is reached. A computational approach is described for correcting the stresses found from the small holes to account for the perturbation of stresses by the material removed by the larger diameter hole. Results of applying this method to find stresses versus depth in a plate subject to uniaxial bending stress and a plate with biaxial residual stresses that vary from compression to tension through the thickness are shown.
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e-mail: dnelson@stanford.edu
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April 2011
Research Papers
Hole-Within-a-Hole Method for Determining Residual Stresses
A. Makino,
A. Makino
NASA/Ames Research Center
, Moffett Field, CA 94035-1000; Department of Mechanical Engineering, Stanford University
, Stanford, CA 94305-4021
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D. V. Nelson,
D. V. Nelson
Department of Mechanical Engineering,
e-mail: dnelson@stanford.edu
Stanford University
, Stanford, CA 94305-4021
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M. R. Hill
M. R. Hill
Department of Mechanical and Aeronautical Engineering,
University of California-Davis
, Davis, CA 95616
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A. Makino
NASA/Ames Research Center
, Moffett Field, CA 94035-1000; Department of Mechanical Engineering, Stanford University
, Stanford, CA 94305-4021
D. V. Nelson
Department of Mechanical Engineering,
Stanford University
, Stanford, CA 94305-4021e-mail: dnelson@stanford.edu
M. R. Hill
Department of Mechanical and Aeronautical Engineering,
University of California-Davis
, Davis, CA 95616J. Eng. Mater. Technol. Apr 2011, 133(2): 021020 (8 pages)
Published Online: March 22, 2011
Article history
Received:
July 3, 2010
Revised:
January 20, 2011
Online:
March 22, 2011
Published:
March 22, 2011
Citation
Makino, A., Nelson, D. V., and Hill, M. R. (March 22, 2011). "Hole-Within-a-Hole Method for Determining Residual Stresses." ASME. J. Eng. Mater. Technol. April 2011; 133(2): 021020. https://doi.org/10.1115/1.4003496
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