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反应堆压力容器法兰密封分析程序系统——瞬态耦合热弹塑性接触分析(英文).docx

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反应堆压力容器法兰密封分析程序系统——瞬态耦合热弹塑性接触分析(英文) Introduction Thepressurevesselisoneofthecriticalcomponentsofanuclearpowerplant,whichhousesthenuclearfuelandradioactivematerials.Hence,theintegrityofthepressurevesselisparamountforthesafeoperationofanuclearpowerplant.Effectivesealingofthepressurevesselflangesiscriticalformaintainingitsstructuralintegrityandpreventingleakageofradioactivematerials.Thispaperdescribesananalyticalprogramsystemforstudyingthesealingofpressurevesselflangesusingtransientcoupledthermo-elasto-plasticcontactanalysis. PressureVesselFlangeSealingAnalysis Thepressurevesselflangesealinganalysissystemconsistsofatransientcoupledthermo-elasto-plasticcontactanalysisprogram.Inthisanalysis,thefiniteelementmethodisusedtomodelthebehaviorofthepressurevesselanditsflanges.Themathematicalmodelsusedinthissystemincludecouplingthermal,mechanical,andplasticityequationsfortheanalysisofpressurevesselflangesealing.Theprogramsystemalsohasthecapabilitytoanalyzethebehaviorofthesealingmaterialsunderextremeconditions. Thethermalanalysisintheprogramsystemisusedtocalculatethetemperaturedistributioninthepressurevesselflangeduringthermalloadings.Theheatgeneratedfromthenuclearfissionprocessistheprimarysourceofheatinthisanalysis.Thethermo-mechanicalanalysisisusedtosimulatethedeformationbehavioroftheflangeunderthermalloadings.Thematerialpropertiesoftheflangesandsealingmaterialsareutilizedtocalculatethestressandstraindistributionsinthepressurevesselflangeduringtheanalysis. Theprogramsystemalsousestheplasticityequationstomodelthebehaviorofthepressurevesselflangeandthesealingmaterialunderhighstressconditions.Theplasticdeformationofthematerialisconsideredwhenitissubjectedtohightemperaturesorhighpressures.Thecoupledthermo-elasto-plasticcontactanalysisisusedtoevaluatethesealingmechanismofthepressurevesselflangesunderextremeconditions. ResultsandDiscussion Theresultsobtainedfromtheanalysisincludethestressandstraindistributioninthepressurevesselflangeandthesealingmaterial.Thisdatacanbeusedtoevaluatethe