Fatigue life prediction of
centrifugal fan blades in the ventilation cooling system of
high-speed-train
N. He 1, LG Tan 1, * , ZW Li1, T. Pang 1, YZ Chen2, C. Yang 2
1 11* Corresponding author.
State
Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,
Hunan University, Changsha 410082, China .
Email address: tlg9@163.com (Ligang
Tan).
Hunan University, Changsha, 410082,
China
2Zhuzhou CRRC times electric co, LTD, Zhuzhou, 412001, China
Abstract:Centrifugal
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
train.
Key words:fatigue
life; finite element model; fan blades; nominal stress; bench test;S-N curve