US3728895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triaxial compression test apparatus
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1970-12-18
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Granted: 1973-04-24
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Expires: 1990-12-18
Abstract
Abstract A high-speed triaxial compression test apparatus having a hollow rectangular frame with a central rectangular test cavity for containing a test sample and a rectangular opening to the test cavity in each side of the frame containing a removable pressurizing module having an inner movable pressure wall, such as a flexible diaphragm, which is pressurized through an inlet port in the module to exert a compression load on the test sample along the respective cavity axes, and transducers for generating signals representing the pressure on and displacement of the pressure wall. The primary application of the apparatus is testing soil and rock samples and other natural and fabricated materials to obtain data concerning their mechanical properties.
Inventors
- 👤 G Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:20
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/08; G01N3/10; G01N2203/00; G01N2203/02; G01N2203/025; G01N2203/0256
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
238 words
A triaxial compression test apparatus comprising: a hollow, one-piece rectangular frame having integral load bearing sections of substantially equal uniform cross-section extending along the frame edges between opposite parallel sides of the frame and permanently integrally joined to one another at the frame corners over the entire cross-section of each section so as to provide a frame devoid of separable joints, said frame containing a central rectangular test cavity and a rectangular opening in each side of said frame on the respective axis of said cavity, whereby said frame has a pair of side openings on each of the three axes of said cavity located in opposite parallel sides of said frame; a pressurizing module at each frame side including a rectangular plate fitting snugly but removably within the respective frame opening, a rectangular diaphram at the inner side of said plate having edge portions positioned between the plate edges and the wall edges of the respective frame opening and beads along said edge portions seating in grooves in said plate edges for securing said diaphram to said plate in fluid sealing relation therewith to define between said diaphram and said plate a pressure chamber, and a port in said plate communicating with said chamber through which a pressure fluid may be introduced into said chamber to urge said diaphram against a test sample within said cavity; and means releasably securing each module in its respective frame opening.
Claim 2
Dependent Claim
238 words
A triaxial compression test apparatus comprising: a hollow, one-piece rectangular frame having integral load bearing sections of substantially equal uniform cross-section extending along the frame edges between opposite parallel sides of the frame and permanently integrally joined to one another at the frame corners over the entire cross-section of each section so as to provide a frame devoid of separable joints, said frame containing a central rectangular test cavity and a rectangular opening in each side of said frame on the respective axis of said cavity, whereby said frame has a pair of side openings on each of the three axes of said cavity located in opposite parallel sides of said frame; a pressurizing module at each frame side including a rectangular plate fitting snugly but removably within the respective frame opening, a rectangular diaphram at the inner side of said plate having edge portions positioned between the plate edges and the wall edges of the respective frame opening and beads along said edge portions seating in grooves in said plate edges for securing said diaphram to said plate in fluid sealing relation therewith to define between said diaphram and said plate a pressure chamber, and a port in said plate communicating with said chamber through which a pressure fluid may be introduced into said chamber to urge said diaphram against a test sample within said cavity; and means releasably securing each module in its respective frame opening.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |