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A method for determining X-ray elastic constants for the measurement of residual stress

Munsi, A.S.M.Y. and Waddell, A.J. and Walker, C.A. (2003) A method for determining X-ray elastic constants for the measurement of residual stress. Strain, 39 (1). pp. 3-10. ISSN 0039-2103

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Abstract

The X-ray diffraction method is arguably the most convenient method of measuring residual stresses in terms of cost, spatial resolution, measurement time and the accuracy of measurement. The normal methods for calibrating X-ray diffractometers are not conveniently applied to automated scanning systems, however, and so a new approach is required. In this study, a scanning X-ray diffractometer was calibrated and the X-ray elastic constant for a steel alloy was determined using a customised four-point bending rig. The bending rig, in turn, was calibrated by dead loading. This study also described a simple alternative method for determining the X-ray elastic constant, without the use of specialised software. After calibration, the error band of the diffractometer was found to be less than ±10 MPa. As this is ±5% of the yield stress for a typical steel, this level of accuracy was deemed to be acceptable for the measurement of residual stress.

Item type: Article
ID code: 6339
Keywords: residual stress, calibration, X-ray diffraction analysis, vibratory stress relief, design engineering, Mechanical engineering and machinery, Engineering design
Subjects: Technology > Mechanical engineering and machinery
Technology > Engineering (General). Civil engineering (General) > Engineering design
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 17 Jul 2008
    Last modified: 16 Jul 2013 19:43
    URI: http://strathprints.strath.ac.uk/id/eprint/6339

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