Research On The Strength And Fatigue Resistance Of Rail Vehicle Wheels And Axle

The wheel pair is a key component of the moving train,which carries various dynamic and static loads generated by the train operation and transmits the force on the track,and the wheel pair strength and fatigue performance have an important impact on the operation safety of the whole train.Therefore,it is necessary to analyze and study the strength and fatigue performance of the wheelsets of high-speed trains to improve the safety of train operation.In this paper,the static strength and fatigue strength of the wheelset are calculated and the fatigue performance of the wheelset is evaluated by taking the wheelset of CRH3 rolling stock as the research object.The main research work is as follows.(1)Firstly,the European standards for wheel and axle strength verification and the Chinese standards for wheel strength design were compared and analyzed,and the applicability and scope of each standard were analyzed.The fatigue strength of the non-powered axle of the CRH3 wheelset was calculated and calibrated using the European standard.(2)In order to quickly realize the axle strength calibration and improve the work efficiency,we used Python language to program and develop the axle strength calibration software,which can automatically calculate the fatigue strength of the axle by simply inputting the physical parameters of the axle into the software,and can automatically display the distribution of all the moment curves to which the axle is subjected and compare all the curves,so as to realize the automation of the axle strength calibration calculation and provide a better solution for the This provides a new method for axle calibration calculation of rolling stock.(3)The finite element model of the wheelset was established by Hyper Mesh,and the interference fit verification analysis of the wheelset axle was carried out according to TB /T1718-2003 standard,and the interference contact stress was calculated,and the reasonable interference interval of the wheelset axle was analyzed,and the influence of centrifugal force on the interference amount of the wheelset axle was considered in the analysis,and the optimal interference amount between the wheels and the axle was determined to ensure the interference fit of the wheelset axle safety.The calculation analysis shows that the safety and stress of the wheel-axle interference fit of CRH3 rolling stock meet the static strength requirements.(4)Based on the established finite element model of the wheelset,the strength of the wheelset under extraordinary operating conditions and normal operating conditions is analyzed and calculated by ABAQUS software according to the standard in the Interim Regulations for Strength Design of Railway Vehicles,and the static strength and fatigue strength of the wheelset of the rolling stock are analyzed according to the stress results.The calculation results show that the fatigue strength of the wheelset of CRH3 meets the requirements.(5)According to the standard EN13979-1,three parts of the wheel rim,wheel hub and wheel spokes,which are more dangerous,were selected as the assessment parts for fatigue evaluation,and the fatigue performance of the assessment points was evaluated by the Goodman graph method;based on the secondary development of ABAQUS,the Goodman fatigue limit graph was programmed and drawn,which improved the efficiency of calculation and analysis.The results show that the fatigue stress state under each working condition is inside the Goodman diagram,and the wheel pair has sufficient fatigue resistance performance.This paper provides a new method for fatigue calibration calculation of rail vehicle wheels,and comprehensively analyzes and evaluates the strength and fatigue resistance of non-powered wheelsets of CRH3 rolling stock to ensure the safety and reliability of train wheelsets.