Measuring Inaccessible Residual Stresses Using Multiple Methods and Superposition |
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Authors: | P Pagliaro M B Prime JS Robinson B Clausen H Swenson M Steinzig B Zuccarello |
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Institution: | 1.Dipartimento di Meccanica,Università degli Studi di Palermo,90128,Palermo,Italy;2.Los Alamos National Laboratory,Los Alamos,USA;3.Department of Materials Science and Technology,University of Limerick,Limerick,Ireland |
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Abstract: | The traditional contour method maps a single component of residual stress by cutting a body carefully in two and measuring
the contour of the cut surface. The cut also exposes previously inaccessible regions of the body to residual stress measurement
using a variety of other techniques, but the stresses have been changed by the relaxation after cutting. In this paper, it
is shown that superposition of stresses measured post-cutting with results from the contour method analysis can determine
the original (pre-cut) residual stresses. The general superposition theory using Bueckner’s principle is developed and limitations
are discussed. The procedure is experimentally demonstrated by determining the triaxial residual stress state on a cross section
plane. The 2024-T351 aluminum alloy test specimen was a disk plastically indented to produce multiaxial residual stresses.
After cutting the disk in half, the stresses on the cut surface of one half were determined with X-ray diffraction and with
hole drilling on the other half. To determine the original residual stresses, the measured surface stresses were superimposed
with the change stress calculated by the contour method. Within uncertainty, the results agreed with neutron diffraction measurements
taken on an uncut disk. |
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