US5172580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-destructive determination of surface cold work due to a shot peening operation
Assignee: General Electric Co
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Filing: 1992-03-02
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Granted: 1992-12-22
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Expires: 2012-03-02
Abstract
Abstract This invention relates to a method for directly measuring the amount of surface cold work due to a surface treatment operation. Such methods of this type, generally, allow the surface cold work created by a shot peening operation to be directly measured without having to destruct the substrate.
Inventors
- 👤 Robert A. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:31
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/56; G01N3/567; B; B24; B24C; B24C1/00; B24C1/10; G01N2203/00; G01N2203/0058; G01N2203/0076; G01N2203/0078; G01N2203/02; G01N2203/022; G01N2203/0248; G01N2203/06; G01N2203/0641; G01N2203/0664; Y; Y10; Y10T; Y10T29/00; Y10T29/47; Y10T29/471
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
127 words
A method for a non-destructive determination of surface cold work due to a shot peening operation including a substrate having a side which has been surface treated, said method comprising the steps of: obtaining profile data of said surface treated side in a non-destructive and direct manner, said profile data being indicative of dents caused by said shot peening operation; selecting a dent from said profile data to be analyzed; calculating a plastic strain for said dent; determining a percent of coverage of said surface treated side; calculating an actual total surface cold work; and adjusting, if needed, the peening operation so that the actual total surface cold work of a subsequently formed dent will be more in conformance with a predetermined desired total surface cold work.
Claim 2
Independent Claim
127 words
A method for a non-destructive determination of surface cold work due to a shot peening operation including a substrate having a side which has been surface treated, said method comprising the steps of: obtaining profile data of said surface treated side in a non-destructive and direct manner, said profile data being indicative of dents caused by said shot peening operation; selecting a dent from said profile data to be analyzed; calculating a plastic strain for said dent; determining a percent of coverage of said surface treated side; calculating an actual total surface cold work; and adjusting, if needed, the peening operation so that the actual total surface cold work of a subsequently formed dent will be more in conformance with a predetermined desired total surface cold work.
Claim 3
Dependent Claim
38 words
The method, according to claim 1, wherein said step of calculating said plastic strain is further comprised of the step of: calculating εp=d.sup.2 /8D.sup.2 wherein: ε p =plastic strain for an individual impact d=dent diameter, and D=shot diameter.
Claim 4
Dependent Claim
49 words
The method, according to claim 1, wherein said step of calculating said actual total surface cold work is further comprised of the step of: calculating Cold Work=ε.sub.p N wherein: Cold Work=the actual total percent surface cold work ε p =plastic strain for an individual impact; and N=percent of coverage.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-22 | 1996-06-22 | 1996-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-22 | 2000-06-22 | 2000-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-22 | 2004-06-22 | 2004-12-22 | $7700.00 | Window Closed / Lapsed |