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

Patent · 31 December 1998

OSTI ID:872371

Pechersky, Martin J ^[1]

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1. Aiken, SC

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.

• Research Organization: WESTINGHOUSE SAVANNAH RIVER CO
• DOE Contract Number: AC09-89SR18035
• Assignee: Westinghouse Savannah River Company (Aiken, SC)
• Patent Number(s): US 5920017
• OSTI ID: 872371
• Country of Publication: United States
• Language: English

Related Subjects

/73/
applying
based
calculation
coating
coatings
comparing
comprising
control
deformation
deforms
degree
enables
enhancement
establishing
fringe
fringe pattern
heating
improved
improved method
indicating
indication
infrared
infrared laser
input
input control
laser
laser based
liquid
liquid temperature
material
material comprising
measurements
measuring
measuring residual
method
pattern
patterns
plastically
plasticized
produce
quantitative
quantitative indication
residual
residual stress
responded
serves
speckle
speckle pattern
spot
steps
stress
stress measurements
studied
subtracting
surface
surrounds
temperature
temperature indicating
thermal
visual