Analysis Of Fatigue Strength Of EMU Wheels And Program Design

The wheel is an important part of the running department of the railway vehicle and plays a crucial role in ensuring the safety of the train.With the continuous development of high-speed railway technology,the speed of train operations has been greatly improved compared to before,and the running condition of EMU wheels has become worse.Fatigue failure of the wheel can have extremely serious consequences,so the evaluation of the fatigue strength of the wheel is particularly important.This paper takes the fatigue evaluation of EMUs as the research objective,introduces the domestic and international wheel fatigue calculations and the development and current status of secondary development of ANSYS software.A variety of multiaxial fatigue assessment methods are described in detail,including stress criterion method,strain criterion method,critical surface criterion method,and energy criterion method.The Kakuno-Kawada criterion is revised.The revised criterion also considers the influence of bending stress and torsional stress on the wheel.Using C++ language and APDL language,the Haigh-Goodman curve method,Sines criterion,Crossland criterion,Kakuno-Kawada criterion,and revised Kakuno-Kawada criterion programming procedure were established.Through the establishment of a secondary development platform,the programmatic calculation of the wheel fatigue strength of EMU was realized.In this paper,CRH3 EMU wheels,CRH5 EMU wheels and a elastic wheel are taken as examples to verify the reliability of the secondary development platform.Select two rows of nodes on the front and back sides of the spoke and web holes as evaluation points,and input load conditions and related material mechanics parameters according to UIC510-5.The software outputs the calculation result to the user in the form of an Excel chart,which can intuitively judge whether the wheel fatigue strength meets the engineering requirements.Through comparison of data,it can be seen that the Kakuno-Kawada criterion revised in the same situation has the smallest safety factor and the highest degree of safety.It helps to ensure the safe operation of EMU wheels.The data of wheel fatigue calculation is huge.The secondary development platform greatly improves the work efficiency of wheel post-processing,and is easy to operate,reduces the calculation cost,and realizes the automation analysisof fatigue strength of the high-speed EMU wheels.