Testing a metal component for cold compression of the metal

Details Testing a metal component for cold compression of the metal Testing a metal component for cold compression of the metal

1995-03-14

1997-04-08

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356354, G01B 902

Patent

active

056193270

ABSTRACT:
The invention provides a method of testing a metal component (1) for cold compression of the metal when used, for example for fatigue enhancement. The component defines a generally smooth surface (6) and includes a region (22), eg an aperture, subject to cold compression which breaks that surface in a given area. The method includes the steps of placing a moire grid (13, 15) such that it is spaced from and coextends with the said area of the surface, directing a source of generally parallel light (16) through the grid (15), and at an oblique angle thereto, at the said area of the surface, and viewing the surface through the grid substantially normal to the surface whereby to observe any light interferences fringes (24) caused by eruption of the surface due to cold compression of the metal.

REFERENCES:
patent: 4794550 (1988-12-01), Grenenkamp, Jr.

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