High temperature static strain sensor development programThe development of resistance strain gages which are useful for static strain measurements on nickel or cobalt superalloy parts inside a gas turbine engine on a test stand were examined. These measurements of a strain gage alloy development program which to be followed by an optional investigation of complete strain gage systems which will use the best of the alloys developed together with other system improvements is reviewed. The specific goal for the complete system is to make measurements to 2,000 micro epsilon with error of only + or - 10% over a 50 hour period. In addition to simple survival and stability, attaining a low thermal coefficient to resistivity, of order 100 ppm/K or less, is also a major goal. The first task was to select candidate alloys or alloy systems using a search of the literature and the available metallurgical theory. Alloy candidates were evaluated and compared by a grading system. Equipment and techniques were developed which are suitable for iterative studies of a variety of compositions. Many compositions were examined and significantly improved alloys were identified.
Document ID
19850002651
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hulse, C. (United Technologies Research Center East Hartford, CT, United States)
Lemkey, F. (United Technologies Research Center East Hartford, CT, United States)
Bailey, R. (United Technologies Research Center East Hartford, CT, United States)
Grant, H. (United Technologies Research Center East Hartford, CT, United States)
Date Acquired
August 12, 2013
Publication Date
October 1, 1982
Publication Information
Publication: NASA. Lewis Research Center Turbine Eng. Hot Sect. Technol. (HOST)