US3589175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamic fatigue testing
Assignee: Shared Technologies Fairchild Telecom Inc
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Filing: 1968-11-20
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Granted: 1971-06-29
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Expires: 1988-11-20
Abstract
Abstract The longitudinal strain and the deflection of a test specimen are monitored and recorded while the load is being applied in a dynamic fatigue test. Strain gauges mounted on a gauge member sense the longitudinal strain and the deflection of the test specimen indirectly. The mounts for the test specimen are designed so specimens can e quickly replaced and adapter sleeves are used so the mounts can accommodate different size test specimens.
Inventors
- 👤 Harold Bock
- 👤 Harold Ernest Elsner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:18
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/32
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
92 words
In dynamic fatigue testing apparatus of the type used to impose cyclical loads on a test specimen along its longitudinal axis, an improvement comprising: a gauge member connected in series with the test specimen as the cyclic load is imposed, the gauge member having a greater endurance limit than the test specimen; means for monitoring the stress on the gauge member along its longitudinal axis as the cyclic load is imposed; and means for monitoring the deflection of the gauge member transverse to its longitudinal axis as the cyclic load is imposed.
Claim 2
Dependent Claim
92 words
In dynamic fatigue testing apparatus of the type used to impose cyclical loads on a test specimen along its longitudinal axis, an improvement comprising: a gauge member connected in series with the test specimen as the cyclic load is imposed, the gauge member having a greater endurance limit than the test specimen; means for monitoring the stress on the gauge member along its longitudinal axis as the cyclic load is imposed; and means for monitoring the deflection of the gauge member transverse to its longitudinal axis as the cyclic load is imposed.
Claim 3
Dependent Claim
106 words
Testing apparatus comprising: first means for holding one end of a test specimen; second means for holding the other end of the test specimen, the second means being spaced from and substantially aligned with the first means on an axis; means for applying a cyclically varying force between the first and second holding means along the axis to impose a load upon a test specimen; first means for monitoring the load imposed upon the test specimen along its longitudinal axis; and second means for monitoring the deflection of the test specimen transverse to its longitudinal axis while the load is being imposed on the test specimen.
Claim 4
Dependent Claim
106 words
Testing apparatus comprising: first means for holding one end of a test specimen; second means for holding the other end of the test specimen, the second means being spaced from and substantially aligned with the first means on an axis; means for applying a cyclically varying force between the first and second holding means along the axis to impose a load upon a test specimen; first means for monitoring the load imposed upon the test specimen along its longitudinal axis; and second means for monitoring the deflection of the test specimen transverse to its longitudinal axis while the load is being imposed on the test specimen.
Claim 5
Dependent Claim
50 words
The apparatus of claim 2, in which the first holding means includes a guage member through which the cyclic force is applied, and the first and second monitoring means comprise strain gauges bonded to the surface of the gauge member and means for indicating the response of the strain gauges.
Claim 6
Dependent Claim
18 words
The apparatus of claim 3, in which the gauge member is a thin, solid, cylindrical piece of material.
Claim 7
Dependent Claim
94 words
The apparatus of claim 4, in which the first monitoring means comprises four strain gauges spaced around the perimeter of the gauge member at 90* intervals and oriented parallel to the axis and means for indicating the response of the four strain gauges, and the secoNd monitoring means comprises four strain gauges spaced around the perimeter of the gauge member at 90* intervals between the respective ones of the first monitoring means and oriented transverse to the axis and means for indicating the response of the four strain guages oriented transverse to the axis.
Claim 8
Dependent Claim
62 words
The apparatus of claim 5, in which the first and second holding means each comprise: a hub having male threads; a specimen mount having a cavity with female threads engageable with the threads of the hub and a bore; and a sleeve with an outside diameter that fits snugly within the bore and an inside diameter that fits snugly around the specimen.
Claim 9
Dependent Claim
42 words
The apparatus of claim 2, in which the first monitoring means comprises longitudinal strain gauges and a recorder connected to the longitudinal strain gauges, and the second monitoring means comprises transverse strain gauges and a recorder connected to the transverse strain gauges.
Claim 10
Dependent Claim
47 words
The apparatus of claim 3, in which the gauge member is a hollow cylinder, the cylinder has at least one flat surface, and the first and second monitoring means comprise strain gauges bonded to the flat surface and means for indicating the response of the strain gauges.
Claim 11
Dependent Claim
36 words
The apparatus of claim 8, in which the strain gauges of the first monitoring means are oriented parallel to the axis and the strain gauges of the second monitoring means are oriented transverse to the axis.
Claim 12
Dependent Claim
19 words
The apparatus of claim 8, in which the gauge member has an opening for access to its hollow interior.
Claim 13
Dependent Claim
42 words
The apparatus of claim 10, in which the gauge member has a bore at one end and a sleeve with an outside diameter forming a tight fit with the bore and an inside diameter forming a tight fit with the test specimen.
Claim 14
Dependent Claim
29 words
The apparatus of claim 3, in which the indicating means is a recorder that registers on a single storage medium both the longitudinal strain and deflection of the specimen.
Claim 15
Dependent Claim
19 words
The apparatus of claim 3, in which the gauge member has a greater endurance limit than the test specimen.
Claim 16
Independent Claim
58 words
A method for fatigue testing a specimen comprising the steps of: imposing a cyclic load on the specimen; monitoring the stress on the specimen along its longitudinal axis while the load is being imposed on the specimen; and monitoring the deflection of the specimen transverse to its longitudinal axis while the load is being imposed on the specimen.
Claim 17
Independent Claim
58 words
A method for fatigue testing a specimen comprising the steps of: imposing a cyclic load on the specimen; monitoring the stress on the specimen along its longitudinal axis while the load is being imposed on the specimen; and monitoring the deflection of the specimen transverse to its longitudinal axis while the load is being imposed on the specimen.
Claim 18
Dependent Claim
50 words
In a method of fatigue testing a specimen by applying a cyclically varying force to the specimen along its longitudinal axis, the improvement which comprises the step of monitoring the deflection of the specimen transverse to its longitudinal axis during the application of the cyclically varying force to the specimen.
Claim 19
Dependent Claim
50 words
In a method of fatigue testing a specimen by applying a cyclically varying force to the specimen along its longitudinal axis, the improvement which comprises the step of monitoring the deflection of the specimen transverse to its longitudinal axis during the application of the cyclically varying force to the specimen.
Claim 20
Independent Claim
66 words
A method of testing a specimen comprising the steps of: applying a cyclically varying force to the specimen through a gauge member; producing an indication of the stress exerted on the gauge member during application of the force; and producing a continuous indication of the deflection of the gauge member transverse to the direction of application of the cyclically varying force during application of the force.
Claim 21
Independent Claim
66 words
A method of testing a specimen comprising the steps of: applying a cyclically varying force to the specimen through a gauge member; producing an indication of the stress exerted on the gauge member during application of the force; and producing a continuous indication of the deflection of the gauge member transverse to the direction of application of the cyclically varying force during application of the force.
Claim 22
Dependent Claim
56 words
In a method of fatigue testing a test specimen by applying a cyclically varying load to the specimen along its longitudinal axis the improvement which comprises the step of applying the load to the specimen through a gauge member having a greater endurance limit than the specimen and sensing the transverse strain on the gauge member.
Claim 23
Dependent Claim
56 words
In a method of fatigue testing a test specimen by applying a cyclically varying load to the specimen along its longitudinal axis the improvement which comprises the step of applying the load to the specimen through a gauge member having a greater endurance limit than the specimen and sensing the transverse strain on the gauge member.
References Cited (Backward Citations)
US3187565A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |