Accession Number : ADA192765

Title :   T55-L-714 Engine Development and Qualification. Engine M11 Low Cycle Fatigue Test Report. (0213-005-87),

Corporate Author : AVCO LYCOMING ENGINE GROUP STRATFORD CT STRATFORD DIV

Personal Author(s) : Kozub, J , Jr

PDF Url : ADA192765

Report Date : Dec 1987

Pagination or Media Count : 113

Abstract : T55-L-713 engine M-11C, which had previously completed 1000 cycles (250 hours) of low cycle fatigue (LCF) testing, was subjected to an additional 1000 cycles of LCF testing. Testing ended when there was a failure in the power turbine section of the engine. The results of investigations completed up to the publication of this report indicate a third turbine blade failure. Prior to the failure, the engine had satisfactorily completed 746 cycles (161.6 hours) of the scheduled second 1000 cycles. Thermodynamic deterioration was consistent with the number of cycles completed and there had been no significant mechanical or performance problems. The average actual gas producer speed (NI), shaft horsepower (SHP), and power turbine inlet temperature are listed. Except for secondary damage suffered in the failure, the T55-L-713 gas producer turbine components were in good condition and showed relatively little thermal distress.

Descriptors :   *DAMAGE, *DETERIORATION, *SHAFTS(MACHINE ELEMENTS), *TURBINE BLADES, *TURBINE COMPONENTS, *TURBINES, CYCLES, FAILURE, FATIGUE, HORSEPOWER, INLETS, MECHANICS, POWER, PROBLEM SOLVING, SECONDARY, TEMPERATURE, THERMAL PROPERTIES, THERMODYNAMICS

Subject Categories : Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE