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

Abstract

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.

Inventors:
 [1]
  1. (Aiken, SC)
Publication Date:
Research Org.:
WESTINGHOUSE SAVANNAH RIVER CO
OSTI Identifier:
872371
Patent Number(s):
US 5920017
Assignee:
Westinghouse Savannah River Company (Aiken, SC) SRS
DOE Contract Number:  
AC09-89SR18035
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
thermal; input; control; enhancement; laser; based; residual; stress; measurements; liquid; temperature; indicating; coatings; improved; method; measuring; material; comprising; steps; applying; spot; coating; surface; studied; establishing; speckle; pattern; surrounds; heating; infrared; plastically; deforms; comparing; patterns; deformation; subtracting; produce; fringe; serves; visual; quantitative; indication; degree; plasticized; responded; enables; calculation; measuring residual; infrared laser; material comprising; improved method; fringe pattern; residual stress; quantitative indication; temperature indicating; input control; stress measurements; speckle pattern; liquid temperature; laser based; /73/

Citation Formats

Pechersky, Martin J. Thermal input control and enhancement for laser based residual stress measurements using liquid temperature indicating coatings. United States: N. p., 1999. Web.
Pechersky, Martin J. Thermal input control and enhancement for laser based residual stress measurements using liquid temperature indicating coatings. United States.
Pechersky, Martin J. Fri . "Thermal input control and enhancement for laser based residual stress measurements using liquid temperature indicating coatings". United States. https://www.osti.gov/servlets/purl/872371.
@article{osti_872371,
title = {Thermal input control and enhancement for laser based residual stress measurements using liquid temperature indicating coatings},
author = {Pechersky, Martin J.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {1}
}

Patent:

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