Measuring and testing – Dynamometers – Responsive to force
Patent
1993-08-03
1994-11-08
Chilcot, Jr., Richard E.
Measuring and testing
Dynamometers
Responsive to force
73768, 73774, G01L 104
Patent
active
053616421
ABSTRACT:
The present invention provides a free field stress gauge that can operate in a medium with ambient normal stress fields up to 10 kilobars. The invention uses two machined parts, a top annulus cover disc portion and an active bottom disc portion such that the annulus top cover disc covers the active bottom disc portion but allows a solid central sensing column to be exposed to ambient conditions. The disc portions have a dual sealing means to protect the strain gauges therein from fluid ingress. The gauge is suitable for measuring stresses of soil and rock formations as well as concrete, asphalt or other materials in either a static or dynamic regime. The stress gauge is designed for high uni-axial stress measurements, improved frequency response, have low hysteretic induced effects in measurements and be a thinner gauge.
REFERENCES:
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patent: 3529468 (1970-09-01), Carlson
patent: 3696317 (1972-10-01), Farr
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patent: 4493220 (1985-01-01), Carignan et al.
patent: 4770049 (1988-09-01), Jones et al.
Rickman et al. "Procedure for Assembling WES Column Based Soil Stress Gag Instruction Report SL-86-1, Sep. 1986, pp. 1-B3.U.S. Army Rpt.
Joachim et al. "Design and Field Experience with WES 10KBAR Airblast and Soil Stress Gage", The Shock & Vibration Bulletin Jun. 1985 pp. 135-146.
Chilcot Jr. Richard E.
Dougherty Elizabeth L.
Marsh Luther A.
The United States of America as represented by the Secretary of
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