| In this paper, based on a subway vehicle wheel as the research object, considering the affect of the interference (aperture ratios of1%o,1.2%o and1.5%o) of wheel-axle, finite element models of the wheel-set are established by ANSYS. According to the standard loads of straight line, curving and switch crossing cases of EN13979-1, considering the braking loads of the three conditiongs, combined with the mechanical load conditions of AAR S660, finite annlysis is made in corresponding to the load cases, then the stress is acquired and the strength calibration is carried out.The results show that under the all load cases the maximum stress and amplitude of radial stress, the second principal stresses of the spoke concentrate in the transition area of the spoke and hub, while the maximum stress of the first principal occurs in the exterior edge of oil hole of the wheel and the highest stress range appears in the transition area of the spoke interior and hub. For the third principal stress, the spoke is mainly in press condition. Comparing with other load cases, the braking cases of curving and switch crossing are worse. The affect of the interference to the spoke is that the stress increases with the increasing interference. Taking the braking case of switch crossing which is the most dangerous working condition for example, in the transition area of the spoke interior and hub, when the interference varies from1‰to1.5‰, the maximum radial stress and the amplitude increase18.96%and19.07%respectively, while in the exterior edge of oil hole of the wheel, the maximum first principal stress largely increases96.20%. This affecting effect isn’t incordance with the local affect theory of solid mechanics and, therefore, the results are still needed to be furtherly verified. The wheel meets the static strength requirements of AAR S660. The safety factor is4.63by checking the radial stress of the spoke in accordance with EN13262while4.19by checking the principal stress in accordance with EN13979-1. |
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