CRH2动车组拖车车轮滚动接触疲劳分析  

作　　者：陈浩森 赵永翔[1] 

机构地区：[1]西南交通大学机械工程学院,四川成都610031

出　　处：《科技创新与应用》2020年第16期106-109,共4页Technology Innovation and Application

摘　　要：滚动接触疲劳已成为车轮踏面及轮辋部位疲劳损伤主要方式之一,为研究CRH2拖车车轮踏面滚动接触疲劳裂纹萌生寿命,通过建立的集成轮对有限元三维模型,考虑了各部件之间的几何、多重过盈、滚动接触的复杂物理构成,利用课题组提出的二次多项式回归法建立踏面危险部位载荷谱-应力谱转化关系;基于最大剪应力方法,运用超长寿命结构疲劳可靠性法研究踏面滚动接触疲劳可靠性;该方法实现了踏面滚动接触疲劳应力的准确计算,分析得出:踏面滚动接触区域以下2.0mm深处在99%置信度和0.9999可靠度下,运行里程是3.29×103;揭示了车轮踏面根部为表面切削和磨耗损失,近基圆和外侧出现剥离,拖车车轮踏面滚动接触部位的影响深度为2.0mm。Rolling contact fatigue has become one of the main ways of fatigue damage on wheel tread and rim.In order to study the initiation life of rolling contact fatigue crack on wheel tread of CRH2 trailer,the three-dimensional finite element model of integrated wheelset is established,and the complex physical composition of geometry,multiple interference and rolling contact between components are considered.The quadratic polynomial regression method proposed by the research group is used to establish the transformation relationship between load spectrum and stress spectrum of tread dangerous parts.Based on the maximum shear stress method,the ultra-long life structure fatigue reliability method is used to study the tread rolling contact fatigue reliability.This method realizes the accurate calculation of the tread rolling contact fatigue stress.The analysis shows that the running mileage of the tread rolling contact area below 2.0 mm under 99%confidence and 0.9999 reliability is 3.29×103.It is revealed that the root of the wheel tread is the loss of surface cutting and wear,the peeling off occurs near the base circle and the outside,and the influence depth of the rolling contact part of the trailer wheel tread is 2.0 mm.

关 键 词：拖车车轮 滚动接触 疲劳裂纹 可靠性 

分 类 号：D913[政治法律—民商法学]