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

Patent · Fri Jan 01 00:00:00 EST 1999

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: Savannah River Site (SRS), Aiken, SC (United States)
• 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

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/