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US3842664A
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Theta-shaped test specimen for composite materials
Assignee: United States Department of the Navy
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Filing: 1973-04-05
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Granted: 1974-10-22
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Expires: 1993-04-05
Abstract
Abstract A configuration for a specimen for testing the stress-related properties of materials, the configuration being a ring with a diametral neck. This configuration is especially useful for testing materials taken from or doubly curved samples of wound materials such as fiber-reinforced composites.
Inventors
- 👤 J Conway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:23
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
A test specimen for determining the stRess-related properties of a material comprising: a unitary specimen fabricated from a sample of material whose properties are to be determined, said specimen being substantially formed in the shape of the Greek letter theta (theta) and being fabricated from a fiberreinforced composite material, said fibers having an orientation, and the diametral portion of the theta -shaped test specimen being oriented relative to said fibers in order to determine the properties of the test material in a predetermined direction relative to the orientation of said fibers.
Claim 2
Dependent Claim
91 words
A test specimen for determining the stRess-related properties of a material comprising: a unitary specimen fabricated from a sample of material whose properties are to be determined, said specimen being substantially formed in the shape of the Greek letter theta (theta) and being fabricated from a fiberreinforced composite material, said fibers having an orientation, and the diametral portion of the theta -shaped test specimen being oriented relative to said fibers in order to determine the properties of the test material in a predetermined direction relative to the orientation of said fibers.
Claim 3
Dependent Claim
21 words
A test specimen as in claim 1 wherein said specimen is also fabricated from a singly curved sample of test material.
Claim 4
Dependent Claim
21 words
A test specimen as in claim 1, wherein said specimen is also fabricated from a doubly curved sample of test material.
Claim 5
Dependent Claim
52 words
A test specimen for determining the stress-related properties of a material comprising: a unitary specimen fabricated from the material whose properties are to be determined, said specimen being substantially formed in the shape of the Greek letter theta (theta), said test specimen being fabricated from a doubly curved sample of test material.
Claim 6
Dependent Claim
52 words
A test specimen for determining the stress-related properties of a material comprising: a unitary specimen fabricated from the material whose properties are to be determined, said specimen being substantially formed in the shape of the Greek letter theta (theta), said test specimen being fabricated from a doubly curved sample of test material.
Claim 7
Dependent Claim
93 words
A test specimen for determining the stress-related properties of a material comprising: a unitary specimen fabricated from a sample of material to be tested, said specimen being in the form of a thin circular ring having a diametral straight section called a ''''neck,'''' the whole specimen thus being substantially shaped like the Greek letter theta (theta), the sides of the neck at its junction with the ring being curved and somewhat flared to meet the curved inner edge of the ring, said specimen being fabricated from a sample of fiber-reinforced, composite test material.
Claim 8
Dependent Claim
93 words
A test specimen for determining the stress-related properties of a material comprising: a unitary specimen fabricated from a sample of material to be tested, said specimen being in the form of a thin circular ring having a diametral straight section called a ''''neck,'''' the whole specimen thus being substantially shaped like the Greek letter theta (theta), the sides of the neck at its junction with the ring being curved and somewhat flared to meet the curved inner edge of the ring, said specimen being fabricated from a sample of fiber-reinforced, composite test material.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |