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Strain-gage-stability measurements for years at 75°C in air

The zero shift of several conventional metal-foil strain gages and organic adhesives was measured for 2 1/2 years at 75°C

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Abstract

The authors have evaluated the performance of three types of metal-foil strain gages for two and a half years at a constant temperature of 75°C in air. The studies included polyimide-backed and phenolic-glass-backed gages with copper-nickel foil (constantan) and glass-fiber-rein-forced epoxy-phenolic-resin-backed gages with nickel-chromium foil (modified Karma). All gages were tested in a three-wire-lead, single-active-gage Wheatstone bridge system at nominal mechanical-strain levels of 0, +1000 and −1000 μm/m.

The polyimide-backed constantan gages used in Installation No. 1 typically zero-shifted more than +200 μm/m after 30 days' testing at 75°C. The phenolic-glass-backed constantan gages used in Installation No. 2 zero-shifted −40 to +20 μm/m after 30 days and +270 to +350 μm/m after 900 days. The glass-fiber-reinforced, epoxyphenolic-resin-backed Karma gages used in Installation No. 3 zero-shifted about +5 μm/m after 30 days, and +20 to +45 μm/m after 900 days. The Karma gages used in Installation No. 3 performed better than the other two types of gages. The measured results for the Karma gages appeared to be independent of the adhesives, test-part material, and mechanical-strain levels that we tested. The high stability and low zero drifts of this gage at 75°C allowed us to reliably correct the measured static-strain data on actual test parts.

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References

  1. Shull, L. C., “The Stability of Open-faced Strain Gages,” presented at the 1970 SESA Spring Meeting, Huntsville, Alabama (May 1970).

  2. Dittbenner, G. R., “The Application of Strip Strain Gages for Measuring Residual Stresses in Beryllium,” Lawrence Livermore Laboratory, Rept. UCRL-74078 Preprint (1972); presented at 3rd International Congress on Experimental Mechanics, Los Angeles, California (May 1973).

  3. Dykes, B. C., “Strain Measurement at Temperatures From 500 to 1800°F,” Instrument Society of America, Pittsburgh, Pa., ISA Preprint No. 16.9-1-66.

  4. Fairbairn, J., “Creep Strain Measurements by Foil Gages on Aluminum Alloys at 150°C to 210°C,” Strain,9 (4), (Oct. 1974). 0725 0738 V 3

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Authors and Affiliations

  1. Lawrence Livermore Laboratory, University of California, 94550, Livermore, CA

    H. S. Freynik Jr. & G. R. Dittbenner

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  1. H. S. Freynik Jr.
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  2. G. R. Dittbenner
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Freynik, H.S., Dittbenner, G.R. Strain-gage-stability measurements for years at 75°C in air. Experimental Mechanics 16, 155–160 (1976). https://doi.org/10.1007/BF02321112

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  • DOI: https://doi.org/10.1007/BF02321112

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