US4610157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface penetrant inspection test piece having varying thickness plating
Assignee: RTX Corp
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Filing: 1984-12-11
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Granted: 1986-09-09
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Expires: 2004-12-11
Abstract
Abstract A test specimen has a carefully controlled series of cracks on its surface and is useful for evaluating surface penetrants employed in non-destructive inspection. A flat brass substrate has a nickel electroplating on one surface, which plating varies in thickness along the length of the panel. The opposing side of the panel has a multiplicity of grooves which locally concentrate strain in the plating when the panel is bent during manufacture, thus providing a crack associated with each groove. In a preferred embodiment, the texture of the cracked surface varies across the panel in the same direction in which the cracks run, thus enabling evaluation of the usefulness of penetrants in finding different size cracks under different surface finish conditions.
Inventors
- 👤 Frank J. Vicki
- 👤 Setsuo Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:27
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/91; G01N21/93
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
83 words
An article for testing the comparative utility of crack penetrants comprised of a substrate having adhered to a first surface a plating of dissimilar material from the substrate, which plating varies in thickness along a length of the substrate, characterized by a plurality of stress concentrators on the second surface of the substrate which opposes the first plated surface, the lengths of the stress concentrators running transverse to the substrate length, the plating having cracks which run essentially parallel to the stress concentrators.
Claim 2
Dependent Claim
83 words
An article for testing the comparative utility of crack penetrants comprised of a substrate having adhered to a first surface a plating of dissimilar material from the substrate, which plating varies in thickness along a length of the substrate, characterized by a plurality of stress concentrators on the second surface of the substrate which opposes the first plated surface, the lengths of the stress concentrators running transverse to the substrate length, the plating having cracks which run essentially parallel to the stress concentrators.
Claim 3
Dependent Claim
14 words
The article of claim 1 characterized by stress concentrators in the form of grooves.
Claim 4
Dependent Claim
16 words
The article of claim 2 characterized by equally spaced apart grooves having widths of 0.05-0.20 mm.
Claim 5
Dependent Claim
17 words
The article of claim 1 characterized by a high stress nickel plating on a comparatively ductile substrate.
Claim 6
Dependent Claim
23 words
The article of claim 1 characterized by a substrate which is a flat plate having a plating thickness which tapers between 0-50 micrometers.
Claim 7
Dependent Claim
30 words
The article of claim 1 characterized by a first surface which varies in surface texture, from rough to smooth in the direction in which the cracks on the surface run.
Claim 8
Independent Claim
80 words
The method of making an article having a taper thickness plating one side, which article is for testing the comparative utility of surface penetrants, characterized by altering the continuity of the side of the article opposite the plating to concentrate stress at specific locations in the plating when a bending moment is applied to the article, to thereby cause a crack to be associated with each alteration, which crack runs transverse to the direction in which the plating is tapered.
Claim 9
Independent Claim
80 words
The method of making an article having a taper thickness plating one side, which article is for testing the comparative utility of surface penetrants, characterized by altering the continuity of the side of the article opposite the plating to concentrate stress at specific locations in the plating when a bending moment is applied to the article, to thereby cause a crack to be associated with each alteration, which crack runs transverse to the direction in which the plating is tapered.
Claim 10
Dependent Claim
27 words
The method of claim 7 characterized by altering the article continuity by means of a series of spaced apart grooves which are 70-80% of the article thickness.
References Cited (Backward Citations)
US3164006A
Cited
JPS4914633A
Cited
US3927551A
Cited
US3946597A
Cited
US4078417A
Cited
JPS5623161A
Cited
JPS5632145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-08 | 1990-03-10 | 1990-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-08 | 1994-03-10 | 1994-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-08 | 1998-03-10 | 1998-09-09 | $7700.00 | Window Closed / Lapsed |