Patent US968411A successfully refreshed from Google Patents.
Patent US3789657A successfully refreshed from Google Patents.
US3789657A
Expired / Lapsed
US
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Grid for strain measurements
Assignee: United States Department of the Army
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Filing: 1971-10-27
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Granted: 1974-02-05
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Expires: 1991-10-27
Abstract
Abstract In stress analysis work a grid system may be affixed to a sheet of metal or other object that undergoes distortion or deformation due to a force being applied thereto. The present grid system of circles and squares (or rectangles) enables easy measurement of maximum and minimum strains and their respective directions and reduces computation time in stress analysis work.
Inventors
- 👤 L Ching
- 👤 C Shafter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:05
CPC Classifications
G; G01; G01B; G01B5/00; G01B5/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A method of measuring stresses and strains comprising affixing a stretchable sheet to an object undergoing deformation due to forces applied thereto, wherein said sheet contains a pattern of a plurality of intersecting horizontal and vertical equidistant straight lines and a plurality of circles having centers at points of intersection of said lines, said sheet undergoing a deformation corresponding to the strained area of said object, and measuring the strain of said strained area by measuring the deformation of said pattern.
Claim 2
Independent Claim
81 words
A method of measuring stresses and strains comprising affixing a stretchable sheet to an object undergoing deformation due to forces applied thereto, wherein said sheet contains a pattern of a plurality of intersecting horizontal and vertical equidistant straight lines and a plurality of circles having centers at points of intersection of said lines, said sheet undergoing a deformation corresponding to the strained area of said object, and measuring the strain of said strained area by measuring the deformation of said pattern.
References Cited (Backward Citations)
US3552856A
Cited
US3613679A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |