A New Composite Leaf Spring for In-Board Bogie of New Generation High-Speed Trains.

Autor: Zhang, Xutong, Hu, Junfeng, Wang, Yifan, Chen, Dingding, Zhang, Siqi, Qian, Rui, Huang, Yinyuan, Thompson, Felix, Ma, Jingxuan, Lu, Wenlong, Cui, Qingji
Zdroj: Applied Composite Materials; Aug2023, Vol. 30 Issue 4, p1377-1392, 16p
Abstrakt: The in-board bogie is designed to be applied in next-generation China railway high-speed trains to further achieve lightweight and higher speed (400 km/h). Traditional steel coil springs could not be used in the in-board bogie due to strict lightweight requirements and narrow installation space. This research aims to propose a buckle-type composite leaf spring assembly to replace the traditional steel coil springs. Meanwhile, the buckle-type leaf spring assembly is needed to meet specific size (length and width less than 720 mm and 120 mm) and performance requirements (ultimate load over 100 kN, vertical stiffness around 1300 N/mm) for the primary suspension. Static and dynamic flexural experiments, as well as relevant finite element method (FEM) analysis were carried out to explore the mechanical properties of the composite leaf springs assembly. Simulation results show that the maximum stress of the leaf spring body under the rated load and ultimate load is 314.6 MPa and 488.1 MPa, respectively. The vertical stiffness of the composite leaf spring assembly from numerical simulation is 1362.3 N/mm, which is consistent with that from the static flexural test (1350.4 N/mm). Experimental results revealed that the vertical stiffness of the composite leaf spring was decreased by 1.06% and 1.32% compared to its initial stiffness after one and two million cycles of cyclic flexural load, respectively, and a slight matrix damage was observed in the leaf spring body. Therefore, this buckle-type composite leaf spring assembly meets the design requirements, and can ensure a safe and smooth operation of high-speed trains. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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