FATIGUE BEHAVIOR OF MATERIALS FOR THE SUPERSONIC TRANSPORT
Quarterly rept. no. 1, 1 May-31 July 1963
LOCKHEED AIRCRAFT CORP BURBANK CA
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The fatigue behavior of candidate sheet materials subjected to supersonic transport load-temperature environments is being evaluated. Three specimen geometries in each of three materials will be used. Constant load amplitude tests will be carried out on specimens without prior exposure and on specimens exposed to load at temperatures of 400 and 650 F for periods to 100, 1,000, and 5,000 hours. The effects of contaminants will be similarly evaluated using exposure at 650 F for 1,000 hours. In addition, realistic wing root loading spectra will be applied on a flight-by-flight basis. In one set of these tests the time at temperature and the sequence of thermal stress cycles will be representative of actual service. In a second set of tests the time at elevated temperature during each flight will be minimized. Finally, tests will be carried out to evaluate the effect of the cycle of pressurization and thermal loading which occurs in fuselage skins once every flight.
- Civilian Aircraft