考虑不同损伤模型的转向架构架疲劳寿命研究

Study on Fatigue Life of Bogie Frames Considering Different Damage Models

【目的】为了更好地分析动车组转向架构架的疲劳寿命。【方法】对某型转向架构架的疲劳关注测点进行了动应力实测,并对其数据进行后处理,通过雨流计数法和波动中心法进行了一维应力谱的编制;通过Miner线性累积损伤模型、一种考虑载荷相互作用及其固有属性损伤的非线性累积损伤模型和Cotern-Dolan非线性累积损伤模型分别对其进行分析计算,推断其疲劳寿命并进行三方对比。【结果】考虑固有损伤的非线性模型分析结果与线性模型计算结果差别微小。【结论】固有属性损伤的非线性属性不明显,Cotern-Dolan非线性累积损伤模型的寿命分析结果与前两种相比整体偏小,但趋势相同,表明其用于疲劳寿命评估更偏保守。

【Objective】In order to better analyze the fatigue life of the high-speed train bogie frame.【Method】dy-namic stress measurements are conducted on the fatigue concern measuring points of a certain type of bogie frame,and the data is post-processed.A one-dimensional stress spectrum is compiled using the rain-flow count-ing method and the fluctuation center method.By analyzing and calculating the Miner linear cumulative damage model,a nonlinear cumulative damage model considering load interaction and inherent attribute damage,and the Cotern-Dolan nonlinear cumulative damage model,their fatigue life is inferred and compared in three aspects.【Result】The results show that the difference between the analysis results of the nonlinear model considering in-herent damage and the calculation results of the linear model is small,indicating that its nonlinear attribute is not obvious.【Conclusion】The life analysis results of the Cotern-Dolan nonlinear cumulative damage model are overall smaller than other kinds,but the trend is the same,indicating that it is more conservative for fatigue life assessment.