Abstract
Evaluation and application of tiny, 0.031-in. gage length, constantan foil-strip strain gages for measuring residual surface stresses in beryllium parts are discussed. The strain gages were applied to one side of the beryllium parts at locations known to have high residual surface stresses. Small coupons were machined from the parts and the opposite side of the coupon was chemically milled with a 10 to 20-percent hydrochloric-acid solution. The strain-gage installation was protected with micro-crystalline wax. The etching process required approximately 20 hr at 75°F. Because of their high stability, glass-fiber-reinforced epoxyphenolic strain gages were used rather than the more readily available polyimide-backed strain gages. Details of the strain-gage installation are presented.
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References
Dittbenner, G. R., Bonding Strain Gages or Other Devices to Beryllium Metal Surfaces, Lawrence Livermore Laboratory Rept. UCRL-71233 (1968).
Dittbenner, G. R., Strain Gage Waterproofing Techniques, Lawrence Livermore Laboratory Rept. UCRL-72040 Rev. 1 (1970).
Stein, P. K., Measurement Engineering,II,Ch. 21,Stein Engineering Service, Inc.,Phoenix (1964).
Shull, L. C., “The Stability of the Open-Faced Strain Gage,” presented at SESA Spring Meeting, Huntsville, AL (May 19–22, 1970).
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This work was performed under the auspices of the U.S. Atomic Energy Commission.
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Dittbenner, G.R. The application of strip strain gages for measuring residual surface stresses in beryllium. Experimental Mechanics 13, 493–496 (1973). https://doi.org/10.1007/BF02322736
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DOI: https://doi.org/10.1007/BF02322736