Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Indicating coating or sheet providing direct visual indication
Patent
1980-04-04
1981-10-06
Ciarlante, Anthony V.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Indicating coating or sheet providing direct visual indication
G01B 530
Patent
active
042928516
ABSTRACT:
An improved grid for computer-aided strain analysis of a deformed metal sheet comprises a preferred grid pattern of noncontacting uniform solid circles formed of thin plated copper and surrounded by exposed sheet surface. The copper circles are applied to the sheet surface and the sheet is deformed, whereupon the circles are stretched into ellipses. After sheet deformation, the ellipse pattern is oxidized to enhance contrast between the copper ellipses and the surrounding sheet metal and thereby enable the pattern to be reliably photographed for computer analysis.
REFERENCES:
patent: 3789657 (1974-02-01), Ching et al.
Ayres et al., "Grid Circle Analyzer-Computer Aided Measurement of Deformation,", SAE Technical Paper, No. 790741, Jun. 11, 1979.
Ciarlante Anthony V.
Fekete Douglas D.
General Motors Corporation
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