摘要
基于高速铁路接触网定位钩和定位支座的材料和服役工况,结合宏观、微观和有限元分析等摩擦学分析测试方法,对定位钩和定位支座进行失效分析。结果表明:定位钩与定位支座连接采用的钩环结构是导致它们在连接处磨损失效的根本原因;钩环结构导致连接处应力集中和局部应力值过高,从而使连接处的次表面材料在高应力的循环作用下萌生微裂纹并形成剥落,剥落的磨屑在摩擦界面被不断碾碎并产生犁削;此外,钩环结构导致定位钩和定位支座在连接处的磨损形式为恶劣的冲滑复合磨损,从而加速了钩环结构连接处的磨损。建议优化定位器与定位支座的连接结构形式、改善连接处的应力集中,可解决定位钩与定位支座的磨损问题。
Based on the materials and service conditions of high speed railway catenary,the failure analysis of positioning hook and positioning support was conducted using tribological analysis and test methods,such as macroscopic,microscopic and finite element analysis.Results showed that the hook-and-loop structure used to connect the positioning hook with the positioning support was the essential reason for the wear failure at the connection joint.The hook-and-loop structure caused the stress concentration at the joint and formed an excessivelocal stress value.Thereby,the sub-surface materials at the joint generatedmicro-cracks and formed spalling under the cyclic action of high stress.Then,the spalling debris was continuously crushed and ploughed at the friction interface.Moreover,the hook-and-loop structure resulted in a severe wear form of impact-sliding at the connection joint between the positioning hook and the positioning support that further accelerated the wear of hook-and-loop structure.Therefore,it is suggested to optimize the connection structure between the localizer and the positioning support and to improve the stress concentration at the joint,and the wear problem of the positioning hook and support can be solved.
作者
谭德强
莫继良
罗健
张琦
朱旻昊
周仲荣
TAN Deqiang;MO Jiliang;LUO Jian;ZHANG Qi;ZHU Minhao;ZHOU Zhongrong(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;China Railway Design Corporation,Tianjin 300142,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2018年第5期111-118,共8页
China Railway Science
基金
国家自然科学基金资助项目(U1534209)
中国铁路总公司科技研究开发计划重大课题项目(2017J005-B)
关键词
接触网
定位钩
定位支座
失效分析
有限元分析
高速铁路
Catenary
Positioning hook
Positioning support
Failure analysis
Finite element analysis
High speed railway
