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Effects of pressure on small foil strain gages

Hydrostatic specimens are used to develop a method whereby small foil strain gages could be used successfully under high pressures

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Abstract

This paper describes the behavior of small foil strain gages under high pressure. Effects of pressure were determined and calibration curves were established in prelininary experiments. The calibrations were then used for correcting measured strains in pressure vessels.

Preliminary experiments at room temperature were conducted on small foil strain gages for pressures up to 35,000 psi. The effects of pressure on the gages bonded with a cynoacrylate contact cement, a room-temperature epoxy cement, a high-temperature epoxy cement and a filled epoxy resin were evaluated. Because the contact cement was least affected by pressure and was easiest to apply, it was chosen for use in successive experiments with different gage installations.

Calibration curves were determined for strain gages of 0.031-, 0.062- and 0.125-in. gage lengths. The compensating gages were under atmospheric pressure. The calibrations included the pressure effects of gages bonded on both concave and convex surfaces, and the effect of tensile prestrains. Data could be duplicated for successive pressure tests and for several gage installations. The calibration curves proved to be an effective way for obtaining accurate readings from the foil strain gages bonded internally to a pressure vessel.

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References

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Authors and Affiliations

  1. Battelle Memorial Institute, Columbus, Ohio

    J. C. Gerdeen (Research Engineer)

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  1. J. C. Gerdeen
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Gerdeen, J.C. Effects of pressure on small foil strain gages. Experimental Mechanics 3, 73–80 (1963). https://doi.org/10.1007/BF02326010

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  • DOI: https://doi.org/10.1007/BF02326010

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