摘要
针对高速列车锻钢制动盘在实际运用中出现的多裂纹问题,通过1∶1台架试验与有限元计算相结合的方法研究了制动盘多裂纹间的作用机制。依据制动盘1∶1台架试验结果发现,盘面裂纹的扩展具有一定的规律性。为进一步研究裂纹间的作用机制,运用有限元方法计算了制动盘在3次连续200km/h紧急制动后的热应力。在此基础上,采用FRANC3D软件建立了制动盘盘面的裂纹模型,分析研究了制动盘裂纹前缘的应力强度因子及多裂纹间的作用机制。分析结果表明,主、副裂纹间的相互作用随着裂纹数量和空间位置的变化而变化,不同的深长比有不同的作用规律;径向裂纹数量越多,盘面裂纹扩展越慢,有效的延缓了制动盘的疲劳破坏。分析结果与制动盘1∶1台架试验时的作用规律相一致。
To address the multiple crack problem occurring to the forged steel brake discs of high-speed train in the practical application, the interaction mechanism between cracks was studied by combining the 1 ： 1 bench test with finite element calculation. The findings from the 1 ： 1 bench test on brake disc proved a certain regu- larity in crack propagation. In order to further investigate the interaction mechanism between cracks, the ther- mal stress on brake disc was calculated in the case of emergency braking three times with the speed of 200 km/ h by using the finite element method. Based on the above research, the crack model of brake disk surface was established using FRANC3D software to analyze the stress intensity factor of crack front and the interaction mechanism between cracks. The results showed that the interaction between the main cracks and secondary cracks changed with the change of the number of cracks and the crack location. Different ratio between the depth and length had different effect. The more the number of the radial cracks was, the slower surface crack growth. As a result, the fatigue failure of the brake disc was effectively delayed. The analysis results were con- sistent with the interaction regularity of the brake disc from the 1 ： 1 bench test.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2016年第3期36-41,共6页
Journal of the China Railway Society
基金
国家高技术研究发展计划(863计划)(2012AA112001)
中央高校基本科研业务费(2011JBM287)
关键词
制动盘
多裂纹扩展
作用参数
应力强度因子
brake disc
propagation of multiple cracks
interaction parameters
stress intensity factor
