{"title":"A Transient Finite Element Model to Simulate the Physical Mechanisms of High-speed Wheel/rail Rolling Contact on a Rail Welding Joint","authors":"Miao Yu, Weidong Wang, Jinzhao Liu","doi":"10.22323/1.300.0040","DOIUrl":null,"url":null,"abstract":"In order to study the influences of defective rail welding joints on wheel/rail interaction, a transient finite element model of a high-speed train passing over rail welding joints is presented on the basis of field measurements. Focusing on the physical mechanisms differences of wheel/rail rolling contact on welding joints with varying rail straightness at rolling speeds of up to 400 km/h, this model takes vehicle/track system dynamics and wheel/rail elastic–plastic deformations into account. The defective thermite welding joint with short wave irregularity easily leads to rail nucleus flaw with residual stress. When the running speed is over 250km/h,the maximum value of wheel/rail vertical force at welding joint has a basic trend of a bilinear increase with the increase of running speed and the unevenness of the welding joint. There is a phase difference between the maximum contact force and the peak joint irregularity. When the high-speed railway operation management standard is 250~350km/h, the short wave irregularity at rail welding joint with over 0.3mm straightness should be grinded.","PeriodicalId":93366,"journal":{"name":"Proceedings. IEEE International Conference on Cloud Computing","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2018-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings. IEEE International Conference on Cloud Computing","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.22323/1.300.0040","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
In order to study the influences of defective rail welding joints on wheel/rail interaction, a transient finite element model of a high-speed train passing over rail welding joints is presented on the basis of field measurements. Focusing on the physical mechanisms differences of wheel/rail rolling contact on welding joints with varying rail straightness at rolling speeds of up to 400 km/h, this model takes vehicle/track system dynamics and wheel/rail elastic–plastic deformations into account. The defective thermite welding joint with short wave irregularity easily leads to rail nucleus flaw with residual stress. When the running speed is over 250km/h,the maximum value of wheel/rail vertical force at welding joint has a basic trend of a bilinear increase with the increase of running speed and the unevenness of the welding joint. There is a phase difference between the maximum contact force and the peak joint irregularity. When the high-speed railway operation management standard is 250~350km/h, the short wave irregularity at rail welding joint with over 0.3mm straightness should be grinded.