Method for measuring residual stresses in materials by plastical

Details Method for measuring residual stresses in materials by plastical Method for measuring residual stresses in materials by plastical

1993-07-13

1995-07-11

Turner, Samuel A.

Optics: measuring and testing

Material strain analysis

By light interference detector

356357, 356432, 73800, G01B 902

Patent

active

054325951

ABSTRACT:
A method for measuring residual stress in a material comprising the steps of establishing a speckle pattern on the surface with a first laser then heating a portion of that pattern with an 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 dung heating and enables calculation of the stress.

REFERENCES:
patent: 4139302 (1979-02-01), Hung et al.
patent: 4248094 (1981-02-01), Thompson et al.
patent: 4249423 (1981-02-01), Viertl et al.
patent: 4522510 (1985-06-01), Rosencwaig et al.
patent: 4722600 (1988-02-01), Chiang
patent: 5166742 (1992-11-01), Kobayashi et al.
"Measurement of Strains at High Temperatures by Means of Electro-Optics Holography", Sciammarella, et al, Jun. 1991.

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