Failure Analysis of an Inter-shaft Bearing of an Aero Gas Turbine Engine

被引：18

作者：

Mishra R.K. ^{[1
]}

Muduli S.K. ^{[1
]}

Srinivasan K. ^{[2
]}

Ahmed S.I. ^{[3
]}

机构：

[1] Regional Center for Military Airworthiness (Engines), Bangalore, Karnataka

[2] Hindustan Aeronautics Limited - Engine Division, Bangalore

[3] Aeronautical Quality Assurance (Engines), Bangalore, Karnataka

来源：

Journal of Failure Analysis and Prevention | 2015年 / 15卷 / 02期

关键词：

Fatigue failure; SEM; Spalling;

D O I：

10.1007/s11668-015-9933-8

中图分类号：

学科分类号：

摘要：

Failure of an inter-shaft bearing in an aero gas turbine engine is investigated to determine its root cause. Teardown inspections followed by metallurgical investigations are carried out on the parts of the failed bearing. None of the components of the bearing has shown any discolouration, wear, or overheating marks. But severe flaking is observed on one side of the outer raceway. It indicates progressive fatigue due to overload. Insufficient clearance due to differential expansion of inner ring and contraction of outer ring due to heating and cooling, respectively, can also result in this type of phenomena. Maintaining oil discipline and using correct grade of oil at proper frequency can address these issues. A comprehensive engine-bearing prognostic approach may be followed utilizing available sensor information on-board the aircraft such as rotor speed, vibration, lube system information, and aircraft maneuvers to predict bearing life and incipient bearing failure. © 2015, ASM International.

引用

页码：205 / 210

页数：5

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