Abstract
Abstract A major safety concern in commercial civil aviation is losing a fan blade from jet engine during its normal operation either due to bird strike or limited fatigue. The assessment of fatigue strength of the support structures like bearing and intermediate connection in aero engine during windmilling has become an essential requirement for safe-fly-home situation. Windmilling is the rotation of a non-operating engine due to the airflow induced forces on the blades caused by the forward motion of the aircraft. The imbalanced rotation during windmilling post fan blade off (FBO) creates unavoidable vibratory loads in transient nature which leads to shorter fatigue life of the support structures. Since the repeated imbalance loads beyond elastic limit of the structure can cause the accumulation of plastic deformation, which exceeds the critical strain limit of the structure. This article deals with the ratcheting behavior (low cycle fatigue) of bearing support structures during windmilling post FBO in aero engine. When the accumulated plastic strain exceeds the critical strain limit of the bearing structure, then it experiences ratcheting fatigue failure.
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