摘要
热斑、疲劳裂纹和应力开裂是钢铁制动盘摩擦面在服役过程中存在的热损伤现象,是导致疲劳裂纹失效的重要起因。研究摩擦面热损伤的形成机理对于防止制动盘的热损伤失效具有重要意义。采用有限元计算与理论分析相结合的方法,研究了制动盘热斑、裂纹和应力开裂3种热损伤的形成机理、影响因素。重点分析了热斑形成的温度条件和材料的组织变化、裂纹的形成和扩展规律以及5种约束所形成热应力的分布规律。
There exist hotspots,fatigue cracks,and stress fracture on friction surfaces of steel or iron brake disc during service,and these thermal damages greatly contribute to the fatigue crack failure of the friction surfaces.So,it is very significant for researching on the forming mechanism of thermal damages above to prevent the fatigue failure of the friction surfaces from occurring.The method used in the paper is to combine FEM analysis with theoretical analysis.Forming mechanism,influencing factors of the thermal damages above were studied by use of the method.The temperature condition and microstructure evolution of hotspots,the behavior of thermal crack initiation and propagation and the distribution of thermal stress contributed to five constraints all were focused on.
出处
《铁道机车车辆》
2012年第3期14-19,共6页
Railway Locomotive & Car
基金
北京交通大学校科研基金项目(M11JB00150)
北京市科委项目(Z090103008309010)
关键词
制动盘
热斑
裂纹
应力开裂
形成机理
brake disc
hotspot
fatigue crack
stress fracture
forming mechanism
