• CN：11-2187/TH
• ISSN：0577-6686

• 运载工程 •

### 高速列车锻钢制动盘热疲劳裂纹耦合扩展特性研究

1. 1. 北京交通大学机械与电子控制工程学院 北京 100044;
2. 北京市轨道交通建设管理有限公司 北京 100037
• 出版日期:2016-05-15 发布日期:2016-05-15
• 作者简介:石晓玲(通信作者),女,1985年出生,博士研究生。主要研究方向为疲劳强度和车辆工程。E-mail：10116310@bjtu.edu.cn;李强,男,1963年出生,博士,教授,博士研究生导师。主要研究方向为机车车辆结构强度、疲劳及可靠性、无损检测方法。E-mail：qli3@bjtu.edu.cn
• 基金资助:
国家自然科学基金(U1134201)和国家科技支撑计划(2011BAG10B01)资助项目

### Research on Coupled Extension Characteristic of Thermal Fatigue Cracks at Forged Brake Disc for High Speed Train

SHI Xiaoling1, LI Qiang1, SONG Zhanxun2, YANG Guangxue1

1. 1. School of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing 100044;
2. Beijing MTR Construction Administration Corporation, Beijing 100037
• Online:2016-05-15 Published:2016-05-15

Abstract: According to the profile of brake disc crack macro-morphology, the main forms of long crack are approximately its own expansion and multiple cracks connectivity. Regarding the brake disk typical conditions during operation, the circumferential residual stress are considerable by calculated the thermal stress in 300 km/h emergency braking using the finite element method. Thereafter, the thermal fatigue crack growth of brake disc is drove through circumferential residual stress. Based on the conclusion, the brake disc grid with crack is established, and then the distribution of the stress intensity factor and the coupled propagation law between multi-cracks in the crack propagation process are researched. The results show that, the stress intensity factor of crack tip have regularity for different initial crack size and the crack shape tends to flatten with crack propagation under same load; When multiple crack are propagated, crack spacing smaller, the faster expansion and the interaction are more obvious; however, considering the structure and size limits, the more the number of cracks, the smaller the stress intensity factor when crack extended to critical value.