Mechanical strain indicator
Abstract
Abstract A DEVICE AND METHOD FOR MEASURING, INDICATING, AND RECORDING THE STRAIN PRODUCED IN STRUCTURAL MEMBERS WHEN SUBJECTED TO A FORCE. A COUPON COMPRISING TWO THICK END PIECES AND A THINNER CENTER MEMBRANE WHICH IS SEPARATED INTO FIBERS OR LIGAMENTS OF VARYING LENGTH. WHEN ATTACHED TO THE MEMBER TO BE TESTED, THE STRAIN PRODUCED CAUSES RUPTURE OF SUCCESSIVE FIBERS STARTING WITH THE SHORTEST FIRST, THE ACTUAL STRAIN BEING ESTABLISHED AS LYING BETWEEN THAT EXISTING IN THE LONGEST FIBER TO FAIL AND THE SHORTEST ONE TO REMAIN WHOLE. VARIATIONS IN PROPERTIES OF MATERIAL AND GEOMETRIES UTILIZED AND APPLICATION OF APPROPRIATE CALIBRATION PERMITS DETERMINATION OF SUCH PARAMETERS AS STRESS, FORCE, LOAD, PRESSURE, ACCELERATION, TORQUE, TEMPERATURE, ETC.
Inventors
- 👤 Keith H Mcfarland
Bibliographic Details
Claims Analysis
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |