A simple theory is developed to explain the effect of hydrostatic pressure on electric-resistance strain gages. For relatively incompressible materials,pressure effect, the algebraic difference between true and observed strain, is (α/GF +β G ) where α is pressure coefficient of resistance,β G is the linear compressibility, andGF the gage factor of the gage material. For Constantan foil gages, pressure effect should be about +0.70×10−7 bar−1, which is approximately what is observed by Milligan and Gardeen and in experiments described here on materials under pressure of up to 10,000 bars.
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Called hereafter simply “strain gages” or “gages”; for detailed description see Perry, C. C. and Lissner, H. R., “The Strain Gage Primer,” McGraw-Hill, New York, 281 pp., 1955.
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