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Effect of pressure on electric-resistance strain gages

Strain-gage behavior under pressure is observed by attaching gages to a variety of materials whose linear compressibility is known precisely


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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Brace, W.F. Effect of pressure on electric-resistance strain gages. Experimental Mechanics 4, 212–216 (1964).

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