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STRAIN DISTRIBUTION ON NOTCHED PLATE SPECIMENS AT CREEP TEMPERATURES
MICHIGAN UNIV ANN ARBOR
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Resistance strain gages and grids of vapor-deposited metal were evaluated for measuring strains at loading and during creep in plates with edge notches. Foil strain gages mounted with thermal-setting cements remained usable to 0.5 or higher strain at 500 F, but indicated creep was first less than, and later more than, optical-extensometer readings. Indications from gages mounted with ceramic cement drifted 10 mu in.in.hr at 1200 F after several hundred hours at temperature, but agreed with the extensometer to one per cent strain. Qualitative measurements were made during loading K sub t 1.8 and 3.6 and for creep K sub t 1.8 of M-470 alloy at 500 F. Plastic strains were too small to determine by the grid lines used. Author
APPROVED FOR PUBLIC RELEASE