With the development of national high-speed railway construction,high-speed railway and EMU have become the main means of transportation in China.In the operation process of high-speed rail and EMU,due to the influence of complex environment and other factors,it is inevitable that some parts will be corroded and cracked.In the light of the problems,we shall scientifically analyze the causes of the problems through sci-entific means and advanced instruments and equipment,find out the hidden dangers and then take effective meas-ures.It has important practical significance for ensuring and improving the quality of high-speed railway products and improving the safety performance of train operation.In this article,that crack analysis of the shaft-end con-nector in motor train set is taken as an example to study and analyze the failure reason,property,process and in-fluence degree of the metal parts,The failure mode,failure mechanism and cause of the product were judged,and the countermeasures to prevent re-failure were put forward.
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