Static Strength Analysis Of High-speed Train Body And Fatigue Life Research On Key Components Of High-speed Train

The two themes of the development of passenger train is speedup and lightweight,however they bring more vehicle strength problems while reducing passengers’ journey time and bringing more economic benefits.Speedup leads to the increase of external excitation frequency,and as a result fatigue problems of vehicle parts arise;lightweight results in the decline of vehicle stiffness,and higher requirements are needed in structure design stage.Moreover,the passenger train speed is becoming more and more quickly and more high speed trains are being put into operation in China.To ensure the safety and reliability of them,the design and application requirements of high-speed train and key parts of them must be meet.Firstly,in this paper,FEA(finite element model)of high-speed train trailer body was established using HyperMesh.And seventeen load cases was defined according to the code EN12663-2003,TB/T 1335-96,JISE7105-89 andUIC566.Then,to assess the strength of the main body parts,car body stiffness and its dynamic performance,static strength,stiffness,and modal analysis of the trailer body were carried out by using ANSYS.after that,to verify the accuracy of the finite element model and the analysis results,the stress of ninety-eight point-weighted was extracted to compare with the test result.Secondly,the formula of reversing fatigue loads was deduced according to the master S-N curve method,and theoretically the feasibility of reversing fatigue loads was proved in case of knowing the loading modes and the fatigue life.And then,FEA model of a high-speed train equipment cabin including the cracking weld was established;and the fatigue load mode of the equipment cabin was defined according to the EN12663-2003 standards and the relevant experimental data.On these basis,the equivalent fatigue load of the equipment cabin was reversed in use of the formula of reversing fatigue loads and was applied to the improved equipment cabin to predict the fatigue life of the stents welds of the improved equipment cabin.Finally,taking the high-speed train bogie motor bracket as the research object,the fatigue life and fatigue failure reason of its potential safety hazard weld were analyzed by using master S-N Curve method,and five kinds of schemes to improve the bracket were put forward according to the principle of stiffness coordination.And then,the strength analysis of the final structure was carried out according to the Siemens motor bracket outline.