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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