铁道车辆转向架构架多轴疲劳强度有限元分析方法

铁道车辆转向架构架在服役过程中承受复杂的多轴疲劳载荷,为构架结构的设计和分析带来困难.本文以某车辆转向架构架为研究对象,为获得构架在复杂多轴载荷作用状态下的应力分布状态,分别建立构架板壳有限元模型和实体有限元模型,并参照UIC 615-4、TB/T 2368-2005和TB/T1335-1996标准,确定计算工况,对该转向架构架强度进行分析计算,并根据ORE B12/RP17提供的钢材Goodman疲劳曲线图,编写后处理程序对构架进行疲劳强度评估.结果表明：两种有限元模型计算分析结果趋于一致;构架结构的应力分布状态呈现面内应力分布占优的状态;采用最大主应力对其进行疲劳强度评估是合理的;两种建模方法获得的构架静强度、疲劳强度评估结果的一致性说明：采用板壳模型代替实体模型对构架进行有限元强度分析是可行合理的,可节省计算资源.

Finite element analysis of multi-axial fatigue strength for railway vehicle bogie frame

Railway vehicle structures endured multi-axial fatigue loads in the service process, which amused many difficulties for bogie frame design and analysis. In this paper, taking a vehicle bogie frame as research ob- ject, in order to obtain the stress distribution of bogie frame under complex multi-axial loads, a shell finite de- ment model and a solid finite dement model of bogie frame were established. According to the standards of UIC 615--4, TB/T 2368--2005 and TB/T 1335--1996, the load condition was defined, and the strength of the bogie frame was analyzed with the analysis software ANSYS. The fatigue strength analysis of bogie frame based on Coodman figure in Code ORE B12/RP17 was made by posttprocessor as well. The results indi- cate that the calculation analysis results of two kinds of finite eminent model are consistent and the stress in the surface is dominant, it is reasonable to assess the fatigue strength using maximum master stress method. The consistency of two finite modes also suggests that using a shell model instead of solid model in the analysis of bogie frame is reasonable.