Improvement of a Structural Fatigue Sensor
Final rept. Apr 1969-Apr 1970
LOCKHEED-GEORGIA CO MARIETTA
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The annealed Constantan foil materials currently used in bonded fatigue sensing devices have fatigue life and sensitivity limitations which place restraints upon practical application to long life service aircraft. These restraints have required the development of more compatible materials to meet present and future applications to fleet aircraft within the Air Force inventory. The effort was eventually directed toward the development of a vacuum deposited sensor. A selected composition of copper-nickel-zinc material was vacuum deposited in a long-range order arrangement so that when disordered by cyclic deformation a relatively large, permanent electrical resistance change was produced. The sensor performance obtained indicates a potential for diversified application to fleet aircraft.
- Metallurgy and Metallography