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提高铁路客车转向架焊接构架疲劳寿命的研究 Title:ResearchonImprovingtheFatigueLifeofWeldedFramesforRailTransitCarBogies Abstract: Theweldedframesofrailtransitcarbogiesaresubjectedtovariousdynamicloadsduringoperation,leadingtotheoccurrenceoffatiguecracksandashortenedservicelife.Thisresearchaimstoinvestigateandimprovethefatiguelifeoftheweldedframesofrailtransitcarbogiesbycomprehensivelyanalyzingthefactorsinfluencingfatiguebehaviorandproposingeffectivemeasurestoenhancethestructuralintegrityanddurability.Throughtheimplementationofthesemeasures,thereliabilityandlongevityofrailtransitcarbogiescanbesignificantlyimproved,ensuringsaferandmorereliabletrainoperations. 1.Introduction: Railwaytransportationplaysacrucialroleinmodernsociety,withrailtransitsystemsbeingusedextensivelyworldwide.Thesafetyandreliabilityofrailtransitcarbogiesareofparamountimportanceforpassengertransportation.However,fatiguecrackingincriticalcomponents,suchastheweldedframesofthebogie,posesasignificantthreattotheoperationalintegrityofrailvehicles.Hence,itisessentialtoconductresearchtoimprovethefatiguelifeofweldedframes,therebyensuringthesafeandefficientoperationofrailtransitsystems. 2.FactorsInfluencingFatigueBehaviorofWeldedFrames: 2.1MaterialSelection: Thechoiceofmaterialsforweldedframessignificantlyimpactstheirfatiguebehavior.Investigatingdifferentmaterialswithhighfatiguestrengthandexcellentweldabilityiscrucialtoenhancethestructuralintegrityandfatigueresistanceofweldedframes. 2.2WeldingProcess: Theweldingprocessemployedinthefabricationofweldedframesgreatlyaffectstheirfatiguelife.Optimizingweldingparameters(e.g.,weldingcurrent,electrodetype,andpost-weldheattreatment)canreduceweldingdefectsandimprovethefatigueperformanceoftheframes. 2.3DesignConsiderations: Designingtheweldedframestoaccommodatetheanticipateddynamicloadsiscrucialforenhancingtheirfatiguelife.Theintegrationoffatiguestrengthanalysisandrigorousinspectionofdesigndetailscanhelpidentifypotentialstressconcentrationsandreducethelikelihoodoffatiguecrackinitiation. 3.Nov