Hostname: page-component-78c5997874-t5tsf Total loading time: 0 Render date: 2024-11-15T09:22:55.072Z Has data issue: false hasContentIssue false
  • English
  • Français

Using XRD elastic and plastic strain data to evaluate the effectiveness of different cold-working techniques in aerospace materials

Published online by Cambridge University Press:  06 March 2012

Beth S. Matlock ,
Daniel J. Snoha  and
Scott M. Grendahl
Beth S. Matlock
Affiliation:
Technology for Energy Corp., Knoxville, Tennessee, USA
Daniel J. Snoha
Affiliation:
U.S. Army Research Laboratory, Aberdeen Proving Ground, Maryland, USA
Scott M. Grendahl
Affiliation:
U.S. Army Research Laboratory, Aberdeen Proving Ground, Maryland, USA
Get access Rights & Permissions [Opens in a new window]

Abstract

Generating compressive stresses in aerospace materials is an important consideration for enhancing fatigue life. Shot peening and cold expansion of holes are two techniques for imparting beneficial compressive stresses. X-ray diffraction is a direct method for measuring elastic strains. Diffraction peak widths are an indication of plastic strain. Elastic and plastic strains can be used to better assess the true condition of a component. This paper presents elastic and plastic strain information from shot peened and cold expanded aerospace materials. Examination of surface data showed which shot peened samples had the deeper layer of compressive stresses. Likewise, elastic and plastic strain data enabled successful ranking of the holes in terms of the maximum amount of cold working.

Keywords

elastic strainsplastic strainsresidual stresspeak widthshot peeningcold-worked holesx-ray diffractionfatiqueaerospace materialslife extension
Type
Applications Of Residual Stress Analysis
Information
Powder Diffraction , Volume 24 , Supplement S1 , June 2009 , pp. S51 - S58
Copyright
Copyright © Cambridge University Press 2009

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Ahmad, A. (2003). Residual Stress Measurement by X-Ray Diffraction (Society of Automotive Engineers, Warrendale, PA).Google Scholar
Landy, M. (2009) (private communication).Google Scholar
Noyan, I. C. and Cohen, J. B. (1987). Residual Stress: Measurement by X-ray Diffraction and Interpretation (Springer-Verlag, New York).CrossRefGoogle Scholar
Ofsthun, M. (2003). “When fatigue quality enhancers do not enhance fatigue quality,” Int. J. FatigueIJFADB, 25, 1223–1228.10.1016/S0142-1123(03)00122-1CrossRefGoogle Scholar
Shepard, M. (2007). “Engineered residual stresses in U.S. Air Force Service,” Proceedings of the Residual Stress Summit, Oak Ridge, Tennessee.Google Scholar
Society of Automotive Engineers (2007). Shot Peening of Metal Parts (Society of Automotive Engineers, Warrendale, PA); Cullity B. D. (1978). Elements of X-Ray Diffraction (Addison-Wesley, Reading, MA), 2nd ed.Google Scholar