Thermal input control and enhancement for laser based residual stress measurements using liquid temperature indicating coatings
Patent
·
OSTI ID:6302314
An improved method for measuring residual stress in a material is disclosed 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. 3 figs.
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC09-89SR18035
- Assignee:
- Westinghouse Savannah River Co., Aiken, SC (United States)
- Patent Number(s):
- US 5920017; A
- Application Number:
- PPN: US 8-961302
- OSTI ID:
- 6302314
- Resource Relation:
- Patent File Date: 30 Oct 1997
- Country of Publication:
- United States
- Language:
- English
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