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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
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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

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