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US3699798A
Expired / Lapsed
US
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Method of increasing beryllium ductility
Assignee: McDonnell Douglas Corp
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Filing: 1970-12-24
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Granted: 1972-10-24
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Expires: 1990-12-24
Abstract
Abstract Reorienting by planar compression loading the atomic planes of deformation in a hexagonal close-packed unit cell of a metal crystal, and in particular beryllium, to improve ductility in a bending mode. In particular ductility in the third dimension (short transverse direction) is accomplished by reorientation of existing slip systems by activating twin systems through planar compression loads. Highly textured sheet material, usually crossrolled from hot pressed block, is of particular interest.
Inventors
- 👤 Raymond H Anderson Jr
- 👤 Bennett V Whiteson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:28
CPC Classifications
C; C22; C22F; C22F3/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
28 words
The method as set forth in claim 1 wherein compression loads are applied longitudinally while restricting lateral movement and permitting expansion in the thickness of said sheet metal.
Claim 2
Dependent Claim
34 words
The method as set forth in claim 1 wherein the beryllium sheeT metal is first cross-rolled, resulting in the C-axis of the beryllium crystal being approximately perpendicular to the plane of said sheet metal.
Claim 3
Dependent Claim
21 words
The method as set forth in claim 1 wherein compressive shock waves are sent through the thickness of said sheet metal.
Claim 4
Dependent Claim
37 words
The method as set forth in claim 4 wherein said sheet metal is first secured to a rigid backing whereby said compression shock waves are reflected back as tensile shock waves to thus apply said tensile loading.
Claim 5
Dependent Claim
19 words
The method as set forth in claim 5 wherein said compressive shock waves are initiated through an explosive charge.
References Cited (Backward Citations)
US3483047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |