Laser shock peening quality assurance by ultrasonic analysis
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United States of America Patent
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Jul 23, 2002
Issued Date -
N/A
app pub date -
Nov 27, 2000
filing date -
Nov 27, 2000
priority date (Note) -
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Abstract
A method for quality control testing of a laser shock peening process of a production workpiece includes (a) ultrasonically scanning at least a portion of a laser shock peened surface on the workpiece wherein a region having deep compressive residual stresses imparted by the laser shock peening process extends into the workpiece from the laser shock peened surface, (b) digitizing a signal derived from the scanning and forming a digitized image of intensity values from the scanning, (c) calculating at least one statistical function value for a plurality of points of the digitized image of the workpiece based on the intensity values, and (d) comparing the statistical function value to a pass or fail criteria for quality assurance of the laser shock peening process or accepting or rejecting the workpiece.
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