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Title: Psi-splitting In Residual Stress Test For Curvature
Author: Yonghe, Yu and Jiawen, He
Source: Conf Proc: ICSP-4, (p.373-378)
Publication year 1990
Document number: 1990054
Number of pages: 6
Abstract:
"Psi-splitting" phenomenon, generally due to shear stresses, can be produced in the residual stress measurement of machining parts with tangential components. But the same
phenomenon is observed when the residual stress of shot peened notch part is measured. X-ray diffraction geometry of curve surface is examined in this paper in order to
explore the mechanism of Psi-splitting by curvature. The theoretic analysis shows, when the sample displacement is involved, the linear relationship between 2+_ and
sin+˛Psi is destroied and Psi-splitting can be observed for curvature, due to X-ray beam shining curvature in different incident angles. This effect increases with sample
axial displacement and the ratio of beam size to curve radius. The influences of the "Psi-splitting" in curvature can be mostly eliminated by taking the average value of
+Psi and -Psi direction tests, so that the satisfactory values of curvature residual stresses can be got. The experiments for the residual stress test of shot peened notch
confirm the theoretic analysis. Finally the comparison between the Psi-splitting by curvature and that by tangential stresses is made.
Descriptors: Psi-splitting; Residual stress; Notch; X-ray diffraction
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