Fatigue life prediction of centrifugal fan blades in the ventilation
cooling system of high-speed-train
AbstractCentrifugal fan blades of high-speed train ventilation and cooling
system are subjected to cyclic loading which will shorten the life of
fan blades. It could cause an accident of high-speed-train in service.
In this study, a modified method based on nominal stress method was
proposed and developed for the fatigue life prediction of centrifugal
fan blades. The finite element model was firstly introduced to analyze
the mode and stress of fan blades based on physical material property.
The fatigue life was predicted based on S-N curve, using the Miner's
cumulative damage rule to calculate total damage. In order to verify the
effectiveness of this method, the experimental tests based on fatigue
bench system were conducted on fan blades, which were typical structure
of the ventilation cooling system of high-speed-train. The damage
mechanism of blades was deduced from the fracture fractographs.
Relatively good correlation was achieved between the prediction model
and actual experimental results, testifying the practicability and
effectiveness of this proposed method. Thus, the research result could
reduce the probability of accidents caused by fan blade damage and
improve the reliability of ventilation cooling system of high-speed