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Pertinent conclusions from an extensive study at the Liquid Metal Engineering Center (LMEC) of the accuracy and performance of high-temperature strain gages are presented, with particular emphasis on that portion of the study pertaining to an evaluation of 16 Armour D-platinum gages fabricated at the LMEC for use up to 1200 F. (Armour D alloy is 70 percent iron, 20 percent chromium, and 10 percent aluminum.) Test apparatus and procedures used to evaluate these gages are described. Variations in gage-to-gage performance, as a function of the test sequence, are analyzed on a statistical basis to assess gage accuracy. It is concluded that there are no suitable commercial gages for the measurement of strains on liquid metal fast breeder reactor (LMFBR) components at temperatures up to 1200 F, and that the Armour D-platinum gage performed better than any of the commercial gages similarly evaluated at the LMEC for use up to 1200 F. The presentation should be of particular interest to those involved in high-temperature strain measurement, or in the interpretation of high-temperature strain measurement with respect to structural or materials behavior.
gages, strain tests, measurements, tests, high temperature, accuracy
Lemcoe, M. M.
Director's technical staff, Liquid Metal Engineering Center, Canoga Park, Calif.