Thermal input control and enhancement for laser based residual s

Details Thermal input control and enhancement for laser based residual s Thermal input control and enhancement for laser based residual s

1997-10-30

1999-07-06

Noori, Max H.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Indicating coating or sheet providing direct visual indication

73800, G01B 1116

Patent

active

059200170

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.

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patent: 5568259 (1996-10-01), Kamegawa
patent: 5728944 (1998-03-01), Nodolink

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