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Determining Stresses in the Presence of Nonlinearities in Interplanar Spacing vs. Sin2ψ

Published online by Cambridge University Press:  06 March 2019

I. C. Noyan  and
J. B. Cohen
I. C. Noyan
Affiliation:
Northwestern University, Dept. of Mat. Sci. and Eng., Technological Institute, Evanston, Il. 60201
J. B. Cohen
Affiliation:
Northwestern University, Dept. of Mat. Sci. and Eng., Technological Institute, Evanston, Il. 60201
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Abstract

The physical meaning of non-linearities in “d” vs. sin2ψ lines, encountered in X-ray measurements of surface residual stresses in polycrystalline materials is investigated. It is shown that when oscillations are present in any one reflection, switching to another reflection to obtain a straight line in “d“ vs. sin2.ψ is feasible only under very special conditions. We also discuss the effect of “quasi-homogeneous” strain distributions and investigate the effects of ψ-range on the accuracy of X-ray residual stress measurements when ψ-splitting” is present. A new geometric error is also discussed that can not be detected by the “annealed powder” method often used for alignment.

Type
II. X-Ray Strain and Stress Determination
Information
Advances in X-Ray Analysis , Volume 27: Thirty-Second Annual Conference on Applications of X-ray Analysis, August 1-5, 1983 , 1983 , pp. 129 - 148
Copyright
Copyright © International Centre for Diffraction Data 1983

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