The traditional contour method maps a singlecomponent of residual stress by cutting a body carefully intwo and measuring the contour of the cut surface. The cut alsoexposes previously inaccessible regions of the body toresidual stress measurement using a variety of other techniques,but the stresses have been changed by the relaxationafter cutting. In this paper, it is shown that superposition ofstresses measured post-cutting with results from the contourmethod analysis can determine the original (pre-cut) residualstresses. The general superposition theory using Bueckner’sprinciple is developed and limitations are discussed. Theprocedure is experimentally demonstrated by determining thetriaxial residual stress state on a cross section plane. The 2024-T351 aluminum alloy test specimen was a disk plasticallyindented to produce multiaxial residual stresses. After cuttingthe disk in half, the stresses on the cut surface of one half weredetermined with X-ray diffraction and with hole drilling onthe other half. To determine the original residual stresses, themeasured surface stresses were superimposed with the changestress calculated by the contour method. Within uncertainty,the results agreed with neutron diffraction measurementstaken on an uncut disk.
|Numero di pagine||12|
|Stato di pubblicazione||Published - 2011|
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