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Focusing Circle Errors in X-Ray Residual Stress Measurements of Nickel-Based Materials

  • E. B. S. Pardue (a1), M. R. James (a2) and R. W. Hendricks (a3)

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An unexplained anomalous sin2ψ split in x-ray stress measurements has consistently resulted from the use of Cr Kα radiation with nickel and austenitic stainless steels. Both, materials have diffraction peaks at low back-reflection angles for this radiation (nickel: 20 ⋍ 134°, austenitic stainless steel: 20 ⋍ 128°). The anomalous split is not evident when the measurements are made using Cr Kβ radiation, In an attempt to explain the errors produced by the Cr Kα radiation, focusing circle effects were analyzed and compared to experimental measurements made with both Cr Kα and Cr Kβ radiation on nickel-based samples,

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1. Zantopulos, H. and Jatczak, C., “Systematic Errors in X-Ray Diffractometer Stress Measurements Due to Specimen Geometry and Beam Divergence,” Advances in X-Ray Analysis, 14, 360376 1970.
2. James, M.R. and Cohen, J.B., “Geometrical Problems with a Position- Sensitive Detector Employed on a Diffractometer,” J. Appl, Crystallogr. 12, 339445 1979.
3. Hendricks, R.W., to be published.
4. Pardue, S.E.B., Research and Development Program to Develop a Nondestructive Evaluation Instrument (X-Ray Diffraction) for Measuring Residual Stresses in a Wide Range of Naval Aviation Material, Final Report, TEC Report R-87-015, April 1987, Contract No. N00019-85-C-0419.
5. Noyan, I.C. and Cohen, J.B., “Determining Stresses in the Presence of Nonlinearities in the Interplanar Spacings Versus Sin2ifi, Adv. in X-Ray Analysis, 27, pp. 129148.(1984).
6. James, M.R., “The Use of Oscillation on PSD-Based Instruments for X-Ray Measurement of Residual Stress,” Exp, Mech., 27, June 1987, No. 2, pp. 164167.
7. S, E.B.. Pardue et al., “X-Ray Stress Analysis of Nickel-Plated Components,” Proceedings of the 1987 SEM Spring Conference on Experimental Mechanics, pp. 703710.

Focusing Circle Errors in X-Ray Residual Stress Measurements of Nickel-Based Materials

  • E. B. S. Pardue (a1), M. R. James (a2) and R. W. Hendricks (a3)

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