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

United States Patent

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.