US4030348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for use in monitoring fatigue life for a plurality of elastomeric specimens
Assignee: National Aeronautics and Space Administration
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Filing: 1976-01-29
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Granted: 1977-06-21
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Expires: 1996-01-29
Abstract
Abstract An improved machine for use in determining the fatigue life for elastomeric specimens. The machine is characterized by a plurality of juxtaposed test stations, specimen support means located at each of the test stations for supporting a plurality of specimens of elastomeric material and means for subjecting the specimens at each of said stations to sinusoidal strain at a strain rate unique with respect to the strain rate at which the specimens at each of the other stations is subjected to sinusoidal strain.
Inventors
- 👤 with respect to an invention of Fletcher James C. Administrator of the National Aeronautics and Space Administration
- 👤 George E. Fitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:15
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/32; G01N3/34; G01N2203/00; G01N2203/0014; G01N2203/0016; G01N2203/02; G01N2203/022; G01N2203/0222
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
An improved machine for use in determining the term of fatigue life for a plurality of elastomeric specimens simultaneously subjected to cyclic strain over a range of frequencies comprising: A. a plurality of test stations arranged in juxtaposition; B. specimen support means located at each of said test stations for supporting in suspension a plurality of specimens of elastomeric materials; and C. tensioning means arranged in coplanar relation with said specimen support means at each of said stations for periodically applying to the specimens supported at each of said stations tensile force of a magnitude suitable for cyclically subjecting the specimens to sinusoidal strain including means for selectively varying the amplitude of the strain to which the specimens are subjected at each of said stations, whereby monitoring of fatigue life over a range of strain amplitudes if facilitated.
Claim 2
Dependent Claim
138 words
An improved machine for use in determining the term of fatigue life for a plurality of elastomeric specimens simultaneously subjected to cyclic strain over a range of frequencies comprising: A. a plurality of test stations arranged in juxtaposition; B. specimen support means located at each of said test stations for supporting in suspension a plurality of specimens of elastomeric materials; and C. tensioning means arranged in coplanar relation with said specimen support means at each of said stations for periodically applying to the specimens supported at each of said stations tensile force of a magnitude suitable for cyclically subjecting the specimens to sinusoidal strain including means for selectively varying the amplitude of the strain to which the specimens are subjected at each of said stations, whereby monitoring of fatigue life over a range of strain amplitudes if facilitated.
Claim 3
Dependent Claim
19 words
The machine of claim 1 further comprising means for establishing common temperature conditions at said plurality of test stations.
Claim 4
Dependent Claim
34 words
The machine of claim 1 further comprising means for detecting failure of said specimens at each of said test stations, whereby determination of the term of the fatigue life for the specimens is facilitated.
Claim 5
Dependent Claim
93 words
The machine of claim 3 wherein said specimen support means located at each of said test stations comprises a first transversely oriented bar supported in a substantially fixed relationship with said machine, and said tensioning means comprises a second elongated bar disposed in substantial parallelism with said first elongated bar and means for imparting to said second bar rectilinear reciprocation at a rate unique with respect to the rate at which rectilinear reciprocation is imparted to the second elongated bar at each of the remaining test stations of said plurality of test stations.
Claim 6
Dependent Claim
80 words
The machine of claim 4 wherein said tensioning means further includes a plurality of disks arranged in a coplanar relation, a drive shaft supporting each of said disks for rotation about the axis thereof, and a drive train interconnecting the drive shaft for simultaneously driving said disks at constant rates of rotation, the rate of rotation for each of said disks being unique with respect to the rate at which the remaining disks of said plurality of disks are rotated.
Claim 7
Dependent Claim
31 words
The machine of claim 5 wherein the rate of rotation for each of said disks differs by a factor of ten from the rate at which each adjacent disk is rotated.
Claim 8
Dependent Claim
44 words
The machine of claim 6 wherein the means for detecting failure of said specimens at each of said test station includes a strain gauge connected with said first horizontal bar and adapted to be stressed in response to tensile force applied to the specimens.
Claim 9
Dependent Claim
32 words
The machine of claim 7 wherein means for establishing common temperature conditions at said plurality of test stations includes means defining an hermetically sealable chamber within which said test stations are arranged.
References Cited (Backward Citations)
US1499546A
Cited
US3535921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |