{"title":"钢轨焊接接头高速轮轨滚动接触物理机制的瞬态有限元模拟","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":"{\"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}","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}
A Transient Finite Element Model to Simulate the Physical Mechanisms of High-speed Wheel/rail Rolling Contact on a Rail Welding Joint
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.