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A time-domain stepwise fatigue assessment to bridge small-scale fracture mechanics with large-scale system dynamics for high-speed maglev lightweight bogies
Engineering Fracture Mechanics ( IF 5.4 ) Pub Date : 2021-04-02 , DOI: 10.1016/j.engfracmech.2021.107711
Feng Guo , Shengchuan Wu , Jianxin Liu , Zhengkai Wu , Shanqiang Fu , Sansan Ding

Maglev trains with an operation speed higher than 600 km/h show a great advantage during the next generation ground transportation. To tackle the structural integrity of maglev bogies made of forged 6082-T6 aluminum alloys, a time-domain stepwise fatigue assessment (TSFA) approach was proposed to consider complex dynamic fatigue loads. Firstly, a vehicle-bridge coupled maglev vehicle dynamic model was established to obtain the time history of service-simulation fatigue loads. Secondly, these variable-amplitude fatigue spectra were introduced to examine the damage accumulation lifetime of the maglev bogie using classical nominal stress method, the swing bar of high-speed maglev bogies was then identified as the safety critical component. To further enhance the service safety and reliability, the remaining life of the swing bar was investigated using damage tolerance method in terms of a real fatigue failure accident from Shanghai maglev trains. Calculation results indicate that the remaining life is sharply reduced from 34.1 years to 19.7 years when an initial crack length of 3.0 mm is generated at the swing bar. More conservative but practical fatigue life can be acquired when using the new TSFA framework instead of individual damage tolerance or safe-life method.



中文翻译:

时域逐步疲劳评估,可在高速磁悬浮轻型转向架的小型断裂力学与大型系统动力学之间架起桥梁

在下一代地面运输中,运行速度超过600 km / h的磁悬浮列车显示出巨大的优势。为了解决由锻造6082-T6铝合金制成的磁悬浮转向架的结构完整性,提出了一种时域逐步疲劳评估(TSFA)方法来考虑复杂的动态疲劳载荷。首先,建立了车桥耦合的磁悬浮车辆动力学模型,以获取服务模拟疲劳载荷的时间历程。其次,引入这些变幅疲劳谱,采用经典标称应力法研究了磁悬浮转向架的损伤累积寿命,然后将高速磁悬浮转向架的摆杆确定为安全关键部件。为了进一步提高服务安全性和可靠性,根据上海磁悬浮列车发生的实际疲劳失效事故,采用损伤容限方法对摆杆的剩余寿命进行了研究。计算结果表明,当摆杆产生3.0 mm的初始裂纹长度时,剩余寿命从34.1年急剧减少至19.7年。当使用新的TSFA框架而不是单个的损伤容限或安全寿命方法时,可以获得更保守但实用的疲劳寿命。

更新日期:2021-04-08
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