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1、第33卷第4期北京交通大学学报Vol.33No.42009年8月JOURNALOFBEIJINGJIAOTONGUNIVERSITYAug.2009文章编号:167320291(2009)0420054206基于有限元仿真车轮多轴疲劳强度分析1221郑红霞,谢基龙,周素霞,冯宝富(1.鲁东大学交通学院先进制造与自动化技术重点实验室,山东烟台264025;2.北京交通大学机械与电子控制工程学院,北京100044)摘要:基于UIC510-3规程和热负荷试验,确定了车轮疲劳强度分析的计算载荷工况,采用有限元方法数值模拟了运行状态下车轮
2、的应力变化规律,进行了车轮疲劳强度评定.采用最大主应力方法将多轴应力状态转化为单轴应力,通过Haigh-Goodman疲劳极限方程,得出机械载荷下车轮辐板孔的疲劳强度满足要求;采用Goodman方程,将制动热负荷产生的零-拉脉动循环转化为对称循环,根据辐板材料的S-N曲线评价,得出单纯制动热负荷下辐板孔满足疲劳强度要求;提出制动热应力与机械波动应力的叠加方法,采用Miner法则预测机械载荷与制动热负荷组合作用下辐板孔裂纹的形成寿命.由不同载荷下车轮疲劳强度的评价结果,判断出导致辐板孔边裂纹形成的载荷因素是机械载荷与坡道制动的综合
3、作用.关键词:车轮;有限元分析;多轴疲劳;疲劳强度中图分类号:U270133文献标志码:AMulti-AxialFatigueStrengthAnalysisofWheelBasedonFEA1221ZHENGHongxia,XIEJilong,ZHOUSuxia,FENGBaofu(1.KeyLaboratoryofAdvancedManufacturingandAutomationTechnology,SchoolofTransportation,LudongUniversity,YantaiShandong264025,C
4、hina;2.SchoolofMechanicalandElectronicControlEngineering,BeijingJiaotongUniversity,Beijing100044,China)Abstract:BasedontheUIC510-3andthethermalloadtest,theloadconditionsforanalyzingthefa2tiguestrengthofthewheelhavebeendetermined.Theradialstressesundertheoperationcond
5、itionswereanalyzedbyusingfiniteelementmethodandthefatiguestrengthofthewheelwasevaluated.Themultiaxialstresswasconvertedintotheuniaxialstresswiththemaximumprincipalstressmethod,andthefatiguestrengthundermechanicalloadwasevaluated.Itcanbeconcludedthatthefatiguestrength
6、cansatisfytherequirementwiththeHaigh-Goodmanfatiguelimitequation.Afterconvertingthezero-tensilestresscycleintosymmetricalcyclewithGoodmanequation,thefatiguestrengthunderbrak2ingthermalloadwasevaluatedtomeetthestrengthrequirementbyusingtheS-Ncurveofplatema2terial.Thes
7、tresssuperimposingmethodwasputforwardforsolvingthestresssuperimpositionundermechanicalandthermalloads.Thecracklifewaspredictedunderintegratedeffectofthemechanicalstressandthermalstress.Thisfatiguestrengthevaluatingresultsaboveshowedthattheintegratedef2fortofthemechan
8、icalloadandthegradebrakingloadwastheloadfactorofthecrack.Keywords:wheel;FEA;multi-axialfatigue;fatiguestrength收稿日期:2008-10-29基金项目:铁
