Numerical Simulation And Analysis Of Ultrasonic Testing Of Critical Plate Defects In EMU

Under the condition of long-term and high-density operation of domestic EMU,small cracks or gradual expansion of cracks may occur in key plates.At present,manual visual inspection is used for key plates of EMU.It is easy to miss the inspection and find small cracks in early stage,which will bring hidden dangers to the operation of EMU.In this paper,an ultrasonic testing method is studied to detect cracks in key plates of EMU.This paper first outlines the principle of ultrasonic testing and equipment selection.Through comparison and selection,the A-type pulse reflection ultrasonic detection method is selected,and the detection method combining the split double crystal straight probe and the ultrasonic direct contact method is selected.Based on the introduction of EMU sheet metal,the analysis of its composition and strength,and the analysis of sheet metal fault data,the over-voltage limiting resistance box is selected as the key sheet metal to be detected,and the causes of the key sheet metal fault are analyzed.At the same time,AUTOCAD software is used to establish the detection model of key sheet metal of EMU.The model is imported into ANSYS software,and the finite element flow analysis and detection experiments are carried out.Finally,the ANSYS software is used to carry out the numerical simulation experiment of ultrasonic wave to detect the existence of cracks,the relative position of cracks,the depth of cracks in key plates.Experiments show that the experimental data obtained in this paper are basically consistent with the actual measurement results,and the result of the research has application reference value.