Column-based stress gauge

Measuring and testing – Dynamometers – Responsive to force

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Details

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:
patent: 2992556 (1961-07-01), Webster
patent: 3529468 (1970-09-01), Carlson
patent: 3696317 (1972-10-01), Farr
patent: 4092856 (1978-06-01), Kanda
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.

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