Photoelastic strain gauge coating and method of using same

Details Photoelastic strain gauge coating and method of using same Photoelastic strain gauge coating and method of using same

1975-08-18

1977-02-22

McGraw, Vincent P.

Optics: measuring and testing

Material strain analysis

With polarized light

73 88A, 356 34, 356 35, G01B 1118

Patent

active

040089606

ABSTRACT:
The photoelastic strain gauge coating comprises a sheet of photoelastic material of predetermined shape having a multiplicity of minute discontinuities or sets of discontinuities arranged in a predetermined grid. The predetermined shape and grid, together with boundary devices, provide a standard format to enable use of supporting computer programs. In practicing the method, the coating is bonded to the workpiece surface to be analyzed, and then illuminated by polarized light and photographed. The photograph is then magnified greatly to enable examination seriatim of the patterns at and about each discontinuity or set of discontinuities. The data thus obtained is processed, using the supporting computer programs to obtain a strain field of the portion of the workpiece covered by the coating.

REFERENCES:
patent: 3067606 (1962-12-01), Oppel
patent: 3289526 (1966-12-01), Tuppeny, Jr. et al.

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