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Theory of the Peak Shift Anomaly due to Partial Burial of the Sampling Volume in Neutron Diffraction Residual Stress Measurements
Author(s) -
Wang X.L.,
Spooner S.,
Hubbard C. R.
Publication year - 1998
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889897008261
Subject(s) - anomaly (physics) , monochromator , neutron diffraction , residual stress , neutron , diffraction , optics , residual , materials science , coincidence , physics , computational physics , condensed matter physics , mathematics , nuclear physics , wavelength , medicine , alternative medicine , algorithm , pathology , composite material
A theory is presented to describe the anomalous peak shift encountered in neutron diffraction residual stress measurements as the specimen is translated into and out of the sampling volume, which is defined by a pair of masking slits inserted before and after the specimen. Analytical formulae for the anomalous peak shift were obtained for both position‐sensitive‐detector‐based diffractometers and conventional scanning diffractometers. The results indicate that the observed peak shift is a complex function of many variables, including the in‐pile collimation, slit widths, slit‐to‐axis distances, mosaic spread of the monochromating crystal, and mismatch in lattice spacing between the sample and the monochromator. Calculations based on the derived analytical formulae are in good agreement with experimental observations. It is shown that by the choice of appropriate experimental conditions, this peak shift anomaly can be suppressed or, in some cases, eliminated altogether.