The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 06, 1981
Filed:
Apr. 04, 1980
Applicant:
Inventor:
Earl G Brewer, Warren, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01B / ;
U.S. Cl.
CPC ...
73762 ;
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.