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Accession Number:
ADA071750
Title:
Brittle Materials Design, High Temperature Gas Turbine
Descriptive Note:
Interim rept. no. 14, 30 Sep 1977-31 Mar 1978
Corporate Author:
FORD MOTOR CO DEARBORN MI
Report Date:
1979-05-01
Pagination or Media Count:
77.0
Abstract:
Modifications in the procedure for hot spin testing ceramic rotors resulted in several changes. Of twenty-five rotors being proposed for hot testing, ten were inspected by dye-penetrant methods, dimensionally inspected, and curvic coupling contact patterns checked. Five have now completed hot testing six are ready for test, and the remainder are in processing. Four ceramic turbine rotors and one rotor hub were qualified for hot testing in the cold spin pit at 55,000 rpm, and three rotors and two rotor hubs were qualified to 70,000 rpm. Blades were lost on all rotors qualified to 70,000 rpm because of gross flaws in the blade cross section. From four to eleven blades per rotor were lost in qualification testing. Six rotors was subjected to a twenty-five hour durability test in the hot spin test rig at 50,000 rpm and 1800 F rim temperature. Four rotors completed the test and two failed during acceleration to test speed. In several instances, post test rotor inspection revealed presence of curvic tooth cracking after disassembly from the test shaft. One of the successful rotors were operated an additional 175 hours to complete the objective of 200 hours at 1800 F rim temperature over a simulated duty cycle speed schedule.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
