Failure Analysis towards Reliable Performance of Aero-Engines
Keywords:
Regression testing, Software error detection, Flight critical software
Abstract
Aero-engines are critical components whose reliable performance decides the primary safety of anaircrafthelicopter. This is met by rigorous maintenance schedule with periodic inspection/nondestructive testingof various engine components. In spite of these measures, failure of areo-engines do occur rather frequentlyin comparison to failure of other components. Systematic failure analysis helps one to identify root causeof the failure, thus enabling remedial measures to prevent recurrence of such failures. Turbine blades madeof nickel or cobalt-based alloys are used in aero-engines. These blades are subjected to complex loadingconditions at elevated temperatures. The main causes of failure of blades are attributed to creep, thermalfatigue and hot corrosion. Premature failure of blades in the combustion zone was reported in one of theaero-engines. The engine had both the compressor and the free-turbine in a common shaft. Detailedfailure analysis revealed the presence of creep voids in the blades that failed. Failure of turbine bladeswas also detected in another aero-engine operating in a coastal environment. In this failure, the protectivecoating on the blades was cracked at many locations. Grain boundary spikes were observed on these locations.The primary cause of this failure was the hot corrosion followed by creep damageReferences
Betterridge, W. & Heslop, J. The nimonic alloys. Ed. 2. Edward Arnold, UK., 1974.
Sims Chester, T. & Hagel, William C. The superalloys. John Wiley & Sons, U.K., 1972.
Viswanathan, R. Damage mechanisms and life assessment of high temperature components.
ASM International, 1989.
Published
2013-01-01
How to Cite
Jayakumar, T., Muralidharan, N., Raghu, N., Kasiviswanathan, K., & Raj, B. (2013). Failure Analysis towards Reliable Performance of Aero-Engines. Defence Science Journal, 49(4), 311-316. https://doi.org/10.14429/dsj.49.3843
Section
Special Issue Papers
Copyright (c) 2016 Defence Science Journal
Where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India