A New Type of X-Ray Diffractometer with Cooperating Robots for Residual Stress Analysis on Large Components


Article Preview

For industrial applications concerning the nondestructive characterization of the nearsurface material condition in terms of residual stresses, work hardening, phase transformation and formation of reaction compounds there is a strong demand for X-ray diffraction measurements on large components with complex geometry. Because many regions of interest on these components are not accessible with conventional laboratory or even mobile X-ray diffractometers, a novel center- free diffractometer with two cooperating robots named "Charon XRD" has been developed at MTU Aero Engines. Using a special optical measuring system to synchronize the two six-axis robots it was possible to achieve positioning accuracies that are comparable to those of conventional stationary diffractometers. This paper describes the design and functionality of Charon XRD and presents calibration and reference measurements, along with first measurements on aero-engine components.



Materials Science Forum (Volumes 524-525)

Edited by:

W. Reimers and S. Quander




R. Hessert et al., "A New Type of X-Ray Diffractometer with Cooperating Robots for Residual Stress Analysis on Large Components", Materials Science Forum, Vols. 524-525, pp. 749-754, 2006

Online since:

September 2006




[1] H.U. Baron, E. Bayer, L. Steinhauser, H. Bradaczek and E. Wasiewicz: Europ. J. NDT Vol. 3 No. 1 (1993), p.17.

[2] D. Greving, M. Gorelik and H. Kington: Review of Progress in QNDE, Vol. 24B, eds. D.O. Thompson and D.E. Chimenti, Plenum, New York, 2005, p.1339.

[3] S. Vulkelich, S. Berkley, S. Russ and E.F. Bradley: Mat. Evaluation (2002), p.884.

[4] R. John, J.M. Larson, D.J. Buchanan and N.E. Ashbaugh: Proc. of the eighth Int. Fatigue Congress, Vol. 2/5, Stockholm, Sweden, 2002, p.1063.

[5] MTU Aero Engines Report, winter 2005/spring 2006, p.10.

[6] B. Scholtes, Verfahrensbeschreibung, Röntgenographische Ermittlung von Spannungen (AWT, 2000). DRAFT prEN 15305: Non-destructive Testing - Test Method for Residual Stress analysis by X-ray Diffraction, July (2005).

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

[8] E. Macherauch and P. Müller: Z. angew. Physik 13 (1961), p.305.

[9] V. Hauk: Structural and Residual Stress Analysis by Nondestructive Methods (Elsevier, Amsterdam, 1997). °±= ±−= 2. 01. 3 15870 HWB MPa σ.