Research And Visual Development Of Anti-fatigue Performance Of EMU Car Body

With the commercial operation of the "Fuxing" Chinese standard high-speed EMU train,my country’s high-speed railway development has completed the transition from "Made in China" to "Created in China".In the process of high-speed and light-weight high-speed trains,the welding fatigue problem of high-speed car bodies has become one of the core issues to ensure the safety of train operation.At present,there is a general problem in the analysis system of the anti-fatigue performance of high-speed car bodies-only the calculation results of the anti-fatigue performance analysis of the car body can be solved,the ability to achieve intuitive visual analysis of the fatigue calculation results is weak,and the operation process to achieve the visualization is cumbersome;Aiming at the problem of the traditional anti-fatigue evaluation system,based on the main SN curve method commonly used in actual engineering and the DVS1608 standard two commonly used vehicle body fatigue performance evaluation standards,a set of visualizations that can be used to analyze the fatigue performance calculation results by color cloud analysis is developed Car body anti-fatigue performance analysis system,the main research contents of this article are as follows:(1)This article establishes a finite element model of the car body in Hyper Mesh,and uses the finite element software ANSYS to calculate and analyze the static strength of the car body.Export the inp file containing the welding seam information and the rst file containing the finite element calculation result information to prepare for the next fatigue analysis;(2)The principle and process of the main S-N curve method and the DVS1608 standard to evaluate the fatigue strength of welds were studied,and a fatigue strength calculation program for welded structures based on C++ language was developed.Based on the main S-N curve method,the structural stress and equivalent structural stress at the weld are studied.Based on the main S-N curves of different materials,the fatigue life at the weld is calculated.Based on the DVS1608 standard,the three evaluation components of the stress at the evaluation point were studied,and the notch curves of different joints were used to evaluate the fatigue strength of the weld,and the program was implemented.Taking the board model as a calculation example,the calculation result of the calculation example is obtained,and the feasibility of calculation by the flow method in this paper is proved;(3)Designed a C++ language programming based on the Open Scene Graph(OSG)open source graphics library to write a visual program for color cloud drawing of fatigue analysis calculation results,intuitively display the fatigue performance analysis results in the cloud mode in the weld of the finite element model Office(4)The fatigue performance calculation module and the calculation result cloud drawing module are integrated to design and develop a welded structure visualization anti-fatigueperformance analysis system.Using the constructed system to perform fatigue analysis on the middle car body of a certain type of EMU,taking the 13 welds in the calculation results as an example,the two methods discussed in this article are used for fatigue assessment,and the fatigue results are separately plotted and verified The feasibility of the fatigue calculation method and visualization method in this paper are compared,and the evaluation results of the two methods are compared.Traditional weld fatigue calculation software rarely studies the visualization of DVS1608 standard calculation results.The welded structure visualization anti-fatigue performance analysis system developed and designed in this paper has its unique three-dimensional visualization interactive function that can more intuitively perform vehicle body fatigue problems.analysis.The evaluation results of the middle car body of a certain type of EMU using software developed based on the process and method mentioned in this paper show that the fatigue resistance of the car body meets the fatigue design requirements,and the trend of the two methods for evaluating the fatigue fatigue degree of the weld seam is basic Consistent.