Design and Failure Modes of A Standard Railway Catenary Cantilever Support
铁路接触网标准腕臂支持装置的设计和故障分析
Abstract: Infrastructure managers of small railways have limited action lines with respect to product development of maintenance components. In many cases, they have a significant number of different components in their operation railway lines. Therefore, they have a poor bargaining power when it comes to ordering components for the railway infrastructure due to small ordering volumes. In addition, a large number of components has to be produced and stored to answer the needs of the operation and maintenance, increasing the overall costs. An approach to reduce the mentioned problems is standardization, which comes as a solution to reduce lifecycle costs due to benefits such as increased production volumes, longer learning curves in manufacturing, maintenance and reduced stock levels. In this paper a set of standard cantilever supports for the railway catenary system were developed thus replacing a set of supports with different designs for similar functions. These components are of critical importance since they are responsible for transmitting the entirety of the pre-loads, as well as train dynamic loads, of the catenary system to the supporting poles. The new proposed solution was modelled and analysed using NX Nastran and ABAQUS simulation tools with contact detection between components. The finite element analyses covered the static behaviour as well as the linear fracture mechanics of cracks in critical areas of the designed cantilever supports. The linear fracture results were also used to estimate the fatigue life of the cantilever supports. The loads were modelled for train speeds of up to 300 km/h. The results indicate that the most likely failure mode is fatigue crack propagation in one of the critical areas of the lower cantilever support under tension with a fatigue life of 8224 load cycles. Due to the low fatigue life of the nodular cast iron GJS-400-15, the B319-T7 and A356-T6 aluminium alloys were also considered, resulting in fatigue lives of 375,990 and 1,093,500 cycles, respectively.
摘要：小型铁路基础设施的管理者在维护组件产品开发方面的作用有限。运营铁路线通常由不同部分组成，因此订单量较小，基础设施管理者在订购铁路基础设施部件时议价能力较差。此外，为了满足操作和维护的需要，必须生产和储备大量组件，于是总成本随之增加。标准化有助于减少上述问题的发生，其具有增加产量、延长制造、维护和降低库存水平的学习曲线等优势，是一种降低生命周期成本的解决方案。本文设计了一套用于铁路接触网系统的标准腕臂支持装置，取代了之前功能类似而设计不同的装置。接触网腕臂结构十分重要，其主要功能是将接触网系统的全部预载荷和列车动态载荷传递至支撑杆。标准化解决方案利用NX Nastran和ABAQUS模拟工具进行建模和分析，同时检测组件之间的接触情况。有限元分析涵盖了静态行为以及设计腕臂结构关键区域裂纹的线性断裂力学，同时将线性断裂结果用于估计腕臂结构的疲劳寿命。本文针对速度高达300 km/h列车的载荷量进行了建模。球墨铸铁GJS-400-15的疲劳寿命较低，B319-T7和A356-T6铝合金的疲劳寿命分别为375，990和1，093，500次循环。分析结果发现，当疲劳寿命处于8224个载荷循环，且一个关键区域在拉伸状态下出现疲劳裂纹扩展时，腕臂支持装置最有可能出现故障。
来源：https://www.sciencedirect.com/science/article/abs/pii/S1350630719308817
发表时间：2019年10月10日
检索：周友
翻译：周友
一审：廖佳丽
二审：彭莉
三审：罗玲娟
上传发布：姜浩
