US4111606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite rotor blade
Assignee: RTX Corp
•
Filing: 1976-12-27
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Granted: 1978-09-05
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Expires: 1996-12-27
Abstract
Abstract A compressor rotor blade for a turbomachine is disclosed. Techniques for increasing the strength to weight ratio of the blade while maintaining adequate resistance to foreign object damage are developed. In one specific embodiment an all composite construction employs matrix materials of varied ductilities and yield strengths to improve the energy absorbing capabilities of the blade.
Inventors
- 👤 Karl Michael Prewo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:49
CPC Classifications
C; C22; C22C; C22C47/00; C22C47/02; C22C47/06; C22C47/062; C22C47/068; F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/282; B; B22; B22F; B22F2998/00; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
58 words
A rotor blade structure comprising a root section, and an elongated airfoil section formed of a core of high strength, high modulus fibers embedded in a first matrix material and a sheath of high strength, high modulus fibers embedded in a second matrix material, said first matrix material having a lower yield strength than said second matrix material.
Claim 2
Dependent Claim
58 words
A rotor blade structure comprising a root section, and an elongated airfoil section formed of a core of high strength, high modulus fibers embedded in a first matrix material and a sheath of high strength, high modulus fibers embedded in a second matrix material, said first matrix material having a lower yield strength than said second matrix material.
Claim 3
Dependent Claim
18 words
The invention according to claim 1 wherein said high strength, high modulus fibers are comprised essentially of boron.
Claim 4
Dependent Claim
16 words
The invention according to claim 2 wherein said first matrix material is comprised essentially of aluminum.
Claim 5
Dependent Claim
15 words
The invention according to claim 3 wherein said first matrix material is aluminum alloy 1100.
Claim 6
Dependent Claim
16 words
The invention according to claim 4 wherein said second matrix material is comprised essentially of aluminum.
Claim 7
Dependent Claim
15 words
The invention according to claim 5 wherein said second matrix material is aluminum alloy 2024.
Claim 8
Dependent Claim
20 words
The invention according to claim 1 wherein the fibers of said core extend in a spanwise direction through the blade.
Claim 9
Dependent Claim
23 words
The invention according to claim 7 wherein the fibers of said sheath are obliquely oriented with respect to said fibers of the core.
Claim 10
Dependent Claim
18 words
The invention according to claim 8 wherein said sheath is formed of a plurality of bias oriented plies.
Claim 11
Dependent Claim
17 words
The invention according to claim 9 wherein said core of spanwise fibers extends into said root section.
Claim 12
Dependent Claim
16 words
The invention according to claim 10 wherein said sheath of fibers extends into said root section.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |