Experimental Investigations on the Effects of Fatigue Crack in Urban Metro Welded Bogie Frame

Applied Sciences

Jing Zheng¹  Pingyu Zhou¹  Jinyi Bai²  Wenjing Wang²  Shengchuan Wu³ 

[1] CRRC Qing Dao SiFang Co., Ltd., Qingdao 266111, China;School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China;State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China;

关键词: fatigue crack;    welded bogie frame;    wheel polygon;    rail corrugation;    running speed;   

DOI  :  10.3390/app10041537

来源: DOAJ

【 摘 要 】

The welded bogie frame is the critical safety part of the urban metro vehicle. This paper focuses on finding out the factors inducing the fatigue cracks initiated from the positioning block weld toe of metro bogie frame. Fracture morphology and metallographic analysis were conducted to identify the failure modes, and on-track tests about the dynamic stress at the positioning block weld toe and vibration acceleration were performed. The typical signals of dynamic stress and acceleration were analyzed from time and frequency domain. The relationship between wheel polygon, rail corrugation, running speed and dynamic stress in amplitude and frequency are investigated in details. Research results show that the micro cracks induced by welding at the weld toe of positioning block propagate to the spring sleeve under relatively high alternating dynamic stress, which is strongly influenced by the wheel polygon, rail corrugation and the train running speed.

【 授权许可】

Unknown