Laser-generated surface skimming longitudinal wave measurement of residual stress in shot peened samples

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Proceedings titleQuantitative Nondestructive Evaluation
Series titleAIP Conference Proceedings; no. 820
Conference32nd Annual Review of Progress in Quantitative Nondestructive Evaluation, July 31-August 5, 2005, Brunswick, Maine, USA
Pages14261433; # of pages: 8
SubjectLaser-ultrasonics; residual stress; shot peening; surface skimming longitudinal wave; SAW
AbstractShot peening is a surface enhancement technique that produces a compressive residual stress in a thin surface layer to extend the fatigue life and prevent stress corrosion cracking of structural components. A laser-ultrasonic non-contact technique is used for determining residual stresses produced by shot peening. The method is essentially based on the acoustoelastic effect of the laser-generated surface skimming longitudinal wave (LSSLW) propagating just below the surface. The LSSLW is found to be more sensitive to residual stress than the Rayleigh surface acoustic wave. When used in combination with the Rayleigh surface wave, this laser ultrasonic technique is shown to be quite effective and provides results in good agreement with x-ray data. Contributing factors such as surface roughness, crystallographic texture and dislocations have been examined and corrections for a satisfactory assessment of residual stress are proposed.
Publication date
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NRC number47919
NPARC number18398999
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Record identifier60415423-51e2-42a4-a333-4b2829506491
Record created2011-08-17
Record modified2016-05-09
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