铁路机车车轮辐板疲劳分析

Fatigue Analysis of Railway Locomotive Wheel's Plate

针对机车车轮源于锈蚀坑的辐板疲劳断裂,参照AAR S-669标准,按照Sines准则,并考虑热载荷、抛丸残余应力和表面缺陷的影响,使用有限元软件ANSYS进行疲劳分析。结果表明:车轮的结构设计符合AAR S-669的要求;若车轮无表面缺陷,即使车轮未经抛丸处理且承受大的热载荷,也不可能发生疲劳;若车轮有表面缺陷且承受大的热载荷,随着应力集中系数的提高,将可能发生疲劳。

For the fatigue fracture of locomotive wheel resulting from a corrosion pit on the plate, the fatigue anal- ysis was performed by applying the Sines criterion referring to AAR S-669 standard, as well as taking thermal loading and peening residual stress and surface defect into account. Results show that the structure design of this wheel satisfies the requirement of AAR S-669. If there is no defect on the surface, the fatigue cannot happen un- der great thermal load even though the plate is not peened; if there are defects on the surface, the fatigue is predict- ed under great thermal load as the stress concentration factor of the surface defect rises.