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Thermal input control and enhancement for laser based residual stress measurements using liquid temperature indicating coatings

United States Patent

5,920,017
July 6, 1999
View the Complete Patent at the US Patent & Trademark Office
Savannah River National Laboratory - Visit the Technology Transfer Website
An improved method for measuring residual stress in a material comprising the steps of applying a spot of temperature indicating coating to the surface to be studied, establishing a speckle pattern surrounds the spot of coating with a first laser then heating the spot of coating with a far infrared laser until the surface plastically deforms. Comparing the speckle patterns before and after deformation by subtracting one pattern from the other will produce a fringe pattern that serves as a visual and quantitative indication of the degree to which the plasticized surface responded to the stress during heating and enables calculation of the stress.
Pechersky; Martin J. (Aiken, SC)
Westinghouse Savannah River Company (Aiken, SC)
08/ 961,302
October 30, 1997
The United States Government has rights in this invention pursuant to Contract No. DE-AC09-89SR 18035 between the U.S. Department of Energy and Westinghouse Savannah River Company.