列車制動盤溫度場和應力場仿真與分析.pdf

1、北京交通大學碩士學位論文列車制動盤溫度場和應力場仿真與分析姓名：楊強申請學位級別：碩士專業(yè)：安全技術及工程指導教師：譚南林20090601北京交通大學碩士學位論文ABSTRACTThereliabilityofthebrakediscisoneofthemainfactorsofinfluencingrunningsafetyAccordingtotheapplicationexperiencesofbrakediscsathomean

2、dabroad，crackscausedbythermalfatiguealeoneofthemainreasonsforthebrakediscdamageSoitisofsignificantimportancetopreventionofdamagesforthermalcracks，choiceanddesignofmaterialofbrakediscsthatsimulationoftemperaturefieldandst

3、ressfieldandanalysisofinfluenceofflawsofbrakediscsonthermalfatiguestressduringbrakingprocessInthispapertakingacertaintrainbrakediscastheresearchobjectthetransienttemperaturefieldandstressfieldwerestudiedduringthebrakingp

4、rocessbasedonFEMsoftwareANSYSTheinfluenceofflawsontemperaturefieldandstressfieldwasdiscussedThepaperwasfocusedasfollowed：1ThenecessaryloadsandtheboundaryconditionsinthefiniteanalysisofthetemperaturefieldwerediscussedAnew

5、methodtocalculatetheheatfluxgeneratedbyfrictiononfrictionsurfaceofbrakediscWasproposed，whichisbasedonfrictionpowerandhoopcontactlengthdistributionofcontactcoupleAmethodofconvertingheatradiationcoefficientintoconvectionco

6、efficientWasappliedandthereforesimplifiedtheboundaryconditionsofthermalanalysis2Accordingtostructuralfeature，the3DsymmetricfiniteelementmodelofthebrakediscwasestablishedThetransienttemperaturefieldduringtheemergencybraki

7、ngprocesswassimulatedusingtwomethodstocalculatetheheatfluxonfrictionsurface，whicharefrictionpowermethodandcommonenergyconversionmethodAndtheresultswereanalyzedindetailandcomparedThecalculationresultsshowthatthefrictionpo

8、wermethodcallillustratetheeffectofhoopcontactlengthbetweendiscandpadontemperaturefielddistribution3ThestressanalysisofbrakediscwasdonewithsequentiallythermalstructuralcouplinganalysisduringtheemergencybrakingTheresultssh

9、owthatthevariedbehaviorofsurfacestressofthediscisfromtensilestresstocompressivestressandthenreturningtotensilestressundertheactionofthermalstressandcentrifugalforceAndthehoopstressisthemainonetocausethecrackinitiationont