US3699808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamic testing device for visco-elastic materials
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1971-10-13
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Granted: 1972-10-24
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Expires: 1991-10-13
Abstract
Abstract A testing device for obtaining dynamic properties of viscoelastic materials is adapted for testing in shear or compression. The device which imposes sinusoidal deformation upon the specimen permits testing over wide ranges of temperatures and frequencies. The displacement and force developed in the specimen are sensed by suitable transducers and with the aid of appropriate controls and instrumentation, the total or complex modulus of the material is found along with its ''''loss'''' or phase angle.
Inventors
- 👤 Bryce W Ford
- 👤 Daniel A Meyer
- 👤 Walter C Warner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:42
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/32; G01N3/38; G01N2203/00; G01N2203/003; G01N2203/005; G01N2203/0051; G01N2203/0058; G01N2203/0092; G01N2203/0094; G01N2203/02; G01N2203/0202; G01N2203/021; G01N2203/022; G01N2203/0222
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
198 words
A device for dynamically testing visco-elastic materials comprising: A. a foundation B. a seismic pad floatably mounted on said foundation and C. a testing machine mounted on said seismic pad including: 1. an electrodynamic vibration exciter adapted to transmit sinusoidal vibrations over a wide range of frequencies along a substantially horizontal axis, 2. a mass of sufficient magnitude to remain substantially immovable in response to vibrations of said exciter axially spaced from said exciter and 3. visco-elastic specimen mounting fixture between said exciter and said mass comprising: a. a movable mounting member connected to said exciter and having at least one planar surface adapted to engage a first surface of at least one test specimen and b. a stationary mounting member connected to said mass having at least one planar surface parallel to said planar surface of said movable mounting member and adapted to engage a second surface of said specimen opposite said first surface thereof, and 4. a plurality of test condition indicators including: a. means for sensing relative displacement between said movable and stationary mounting members and b. means for sensing force by said specimen resisting said relative displacement between said movable and stationary mounting members.
Claim 2
Independent Claim
198 words
A device for dynamically testing visco-elastic materials comprising: A. a foundation B. a seismic pad floatably mounted on said foundation and C. a testing machine mounted on said seismic pad including: 1. an electrodynamic vibration exciter adapted to transmit sinusoidal vibrations over a wide range of frequencies along a substantially horizontal axis, 2. a mass of sufficient magnitude to remain substantially immovable in response to vibrations of said exciter axially spaced from said exciter and 3. visco-elastic specimen mounting fixture between said exciter and said mass comprising: a. a movable mounting member connected to said exciter and having at least one planar surface adapted to engage a first surface of at least one test specimen and b. a stationary mounting member connected to said mass having at least one planar surface parallel to said planar surface of said movable mounting member and adapted to engage a second surface of said specimen opposite said first surface thereof, and 4. a plurality of test condition indicators including: a. means for sensing relative displacement between said movable and stationary mounting members and b. means for sensing force by said specimen resisting said relative displacement between said movable and stationary mounting members.
Claim 3
Dependent Claim
22 words
a mass of sufficient magnitude to remain substantially immovable in response to vibrations of said exciter axially spaced from said exciter and
Claim 4
Dependent Claim
22 words
a mass of sufficient magnitude to remain substantially immovable in response to vibrations of said exciter axially spaced from said exciter and
Claim 5
Dependent Claim
26 words
The device defined in claim 1 wherein said means for sensing force by said specimen is a load cell operatively associated with said stationary mounting member.
Claim 6
Dependent Claim
26 words
The device defined in claim 2 wherein said means for sensing relative displacement between said movable and stationary mounting members is a linear variable differential transformer.
Claim 7
Dependent Claim
81 words
visco-elastic specimen mounting fixture between said exciter and said mass comprising: a. a movable mounting member connected to said exciter and having at least one planar surface adapted to engage a first surface of at least one test specimen and b. a stationary mounting member connected to said mass having at least one planar surface parallel to said planar surface of said movable mounting member and adapted to engage a second surface of said specimen opposite said first surface thereof, and
Claim 8
Dependent Claim
81 words
visco-elastic specimen mounting fixture between said exciter and said mass comprising: a. a movable mounting member connected to said exciter and having at least one planar surface adapted to engage a first surface of at least one test specimen and b. a stationary mounting member connected to said mass having at least one planar surface parallel to said planar surface of said movable mounting member and adapted to engage a second surface of said specimen opposite said first surface thereof, and
Claim 9
Dependent Claim
40 words
a plurality of test condition indicators including: a. means for sensing relative displacement between said movable and stationary mounting members and b. means for sensing force by said specimen resisting said relative displacement between said movable and stationary mounting members.
Claim 10
Dependent Claim
40 words
a plurality of test condition indicators including: a. means for sensing relative displacement between said movable and stationary mounting members and b. means for sensing force by said specimen resisting said relative displacement between said movable and stationary mounting members.
Claim 11
Dependent Claim
23 words
The device defined in claim 2 wherein said means for sensing relative displacement between said movable and stationary mounting members is an accelerometer.
Claim 12
Dependent Claim
26 words
The device defined in claim 1 wherein said means for sensing relative displacement between said movable and stationary mounting members is a linear variable differential transformer.
Claim 13
Dependent Claim
23 words
The device defined in claim 1 wherein said means for sensing relative displacement between said movable and stationary mounting members is an accelerometer.
Claim 14
Dependent Claim
40 words
The device as defined in claim 1 wherein said at least one planar surface of said movable mounting member and said at least one planar surface of said stationary mounting member are disposed substantially parallel to said substantially horizontal axis.
Claim 15
Dependent Claim
25 words
The device as defined in claim 7 further comprising an environmentAl chamber surrounding said mounting fixture and means to control the temperature within said chamber.
Claim 16
Dependent Claim
40 words
The device as defined in claim 1 wherein said at least one planar surface of said movable mounting member and said at least one planar surface of said stationary mounting member are disposed substantially perpendicular to said substantially horizontal axis.
Claim 17
Dependent Claim
25 words
The device as defined in claim 9 further comprising an environmental chamber surrounding said mounting fixture and means to control the temperature within said chamber.
References Cited (Backward Citations)
US3039297A
Cited
US3550427A
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 |