Residual Stress Error Introduced by Truncated Patterns: Prediction and Correction

Abstract:

Article Preview

The truncation of diffraction patterns in residual stress determination is often observed for broadened peaks when the 2θ acquisition range is not wide enough. The loss of information effects induced can either be traduced by a bad estimation of the background line, for the methods including a background subtraction, or a restriction of the analysis area for the others. In that borderline case, the results obtained by all methods with theirs specific parameters, developed to estimate the peak localisation are rather distributed in a wide range of stress values. In this paper we propose to review and to test some of the most common methods for stress evaluation (parabola, middle of chord, centred centroïd, asymmetrical pseudo-Voigt fitting). A separate study is made concerning error introduced on the 2θ peak position and on the final stress value estimated. For the parabola method, an analytical expression including some approximations such as the peak shape and its full width at half maximum is then given for the prediction and the correction of these errors. This study is sponsored by PSA PEUGEOT-CITROËN, RENAULT and SNECMA.

Info:

Periodical:

Materials Science Forum (Volumes 490-491)

Edited by:

Sabine Denis, Takao Hanabusa, Bob Baoping He, Eric Mittemeijer, JunMa Nan, Ismail Cevdet Noyan, Berthold Scholtes, Keisuke Tanaka, KeWei Xu

Pages:

171-176

Citation:

C. Ferreira et al., "Residual Stress Error Introduced by Truncated Patterns: Prediction and Correction", Materials Science Forum, Vols. 490-491, pp. 171-176, 2005

Online since:

July 2005

Export:

Price:

$38.00

[1] I.C. Noyan & J.B. Cohen, Residual Stress : Measurement by Diffraction and Interpretation, Springer (1987), New York.

[2] Gounet Lespinasse, B. Guarc, J.L. Lebrun, Optimisation of residual stress analysis of gears by x-ray diffraction, ECRS4 proceedings, Cluny , (1996), pp.317-326.

[3] B. Bourniquel, Thesis, IUT Saint-Nazaire, (1988), pp.39-71.

[4] C. Ferreira, M. François, Calcul des erreurs introduites dans la détermination des contraintes résiduelles par difraction des rayons X par une mauvaise estimation de l'angle ψ, GFAC proceedings, Troyes, (2002), pp.155-160.

DOI: https://doi.org/10.1051/lhb/1967015

[5] F. Convert, Mesure des déplacement des pics de diffraction très larges dans l'analyse des contraintes par diffractométrie X, Revue Française de Mécanique n° 1993-1, pp.81-92.

[6] W. Pfeiffer, The Role of the Peak Location Method in X-ray Stress Measurement, ICRS 4 proceedings, (1994), pp.148-155.

Fetching data from Crossref.
This may take some time to load.