A rigid-flexible coupling finite element model of coupler for analyzing train instability behavior during collision  

作　　者：Jingke Zhang Tao Zhu Bing Yang Xiaorui Wang Shoune Xiao Guangwu Yang Yanwen Liu Quanwei Che 

机构地区：[1]State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China [2]Changchun Railway Vehicles Co.,Ltd.,Changchun 130062,China [3]CRRC Qingdao Sifang Co.,Ltd.,Qingdao 266111,China

出　　处：《Railway Engineering Science》2023年第4期325-339,共15页铁道工程科学（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(No.52172409);Sichuan Outstanding Youth Fund(No.2022JDJQ0025).

摘　　要：Rail vehicles generate huge longitudinal impact loads in collisions.If unreasonable matching exists between the compressive strength of the intermediate coupler and the structural strength of the car body,the risk of car body structure damage and train derailment will increase.Herein,a four-stage rigid-flexible coupling finite element model of the coupler is established considering the coupler buckling load.The influence of the coupler buckling load on the train longitudinal-vertical-hori-zontal buckling behavior was studied,and the mechanism of the train horizontal buckling instability in train collisions was revealed.Analysis results show that an intermediate coupler should be designed to ensure that the actual buckling load is less than the compressive load when the car body structure begins to deform plastically.The actual buckling load of the coupler and the asymmetry of the structural strength of the car body in the lateral direction are two important influencing factors for the lateral buckling of a train collision.If the strength of the two sides of the car body structure in the lateral direction is asymmetrical,the deformation on the weaker side will be larger,and the end of the car body will begin to deflect under the action of the coupler force,which in turn causes the train to undergo sawtooth buckling.

关 键 词：Intermediate coupler Rigid-flexible coupling finite element model Design buckling load Actual buckling load Lateral buckling instability 

分 类 号：U270.34[机械工程—车辆工程]