动车组车轮薄轮缘旋修廓形轮缘强度分析

Flange Strength Analysis of EMU Wheels with Thin-flange Turning Profile

面对工程中最小轮缘厚度多依据经验确定的现状,利用ANSYS建立了考虑CR400AF型动车组车轮薄轮缘旋修廓形的三维轮轨静态接触有限元模型,钢轨选用CN60,轮径取极小值850 mm,轮轨载荷取自UIC 510-2020标准。分析了不同横移、载荷下的轮轨接触状态,对比了22.0、26.0、32.9 mm这3种典型轮缘厚度下轮辋和轮缘内应力分布。重点分析设计廓形接触和磨耗后共形接触条件下,轮缘贴靠和道岔通过时轮缘内部应力场分布特征,及其最大应力的幅值和发生位置,总结了特征应力随轮缘厚度的变化规律。以车轮360 MPa的许用应力作为评判准则,发现工程中采用的轮缘最薄22.0 mm的车轮轮缘强度有保障。提出了薄轮缘车轮安全评估的接触分析策略,为未来最小轮缘厚度研究奠定了基础,也为现行薄轮缘车轮的运营提供了关键服役应力信息。

In view of the fact that the minimum flange thickness is mostly determined by experience in engineering practice,a threedimensional wheel-rail static contact finite element model considering the thin flange turning profile of CR400AF EMU wheels is established by using ANSYS.The steel rail is CN60,the minimum wheel diameter is 850 mm,and the wheel-rail load is taken from the UIC 510-2020 standard.The wheel-rail contact state under different lateral displacement and load is analyzed,and the stress distribution of rim and flange under three typical flange thickness of 22.0 mm,26.0 mm and 32.9 mm is compared.The distribution characteristics of stress field inside the rim,the amplitude and location of the maximum stress under the conditions of designed profile contact and worn conformal contact are analyzed,and the variation law of characteristic stress with the thickness of the rim is summarized.Taking the allowable stress of the wheel of 360 MPa as the evaluation criterion,it is found that the flange strength of wheel with the thinnest wheel flange of 22.0 mm used in practice is guaranteed.In summary,the contact analysis strategy for safety assessment of thin flange wheels is put forward,which lays a foundation for the future research of minimum rim thickness and provides key service stress information for the current operation of thin flange wheels.