Method for quantitative inspection of cold-expanded fastener hol

Details Method for quantitative inspection of cold-expanded fastener hol Method for quantitative inspection of cold-expanded fastener hol

1994-12-16

1996-01-02

Measuring and testing

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

By loading of specimen

73802, 29407, 29705, G01M 500

Patent

active

054798299

ABSTRACT:
A method for inspecting a cold expanded fastener hole in a structural part to confirm that the hole has been expanded by a desired amount involves determining the degree to which the hole has been expanded as a function of the out-of-plane deformation in material surrounding an entrance or exit of the hole formed as a result of the cold expansion process. Out-of-plane deformation at either of the entrance or exit is compared to a model constructed from an array of experimentally or analytically determined out-of-plane deformation profiles for a hole with the same, or substantially the same, dimensions subjected to varying degrees of cold expansion. The degree of expansion of the hole is derived based on this comparison.

REFERENCES:
patent: 4557033 (1985-12-01), Champoux
patent: 5154780 (1992-10-01), Premkumar
patent: 5265456 (1993-11-01), Kennedy et al.
patent: 5297435 (1994-03-01), Papazian
patent: 5305627 (1994-04-01), Quincey et al.

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