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变压吸附器疲劳裂纹扩展剩余寿命的研究.docx

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变压吸附器疲劳裂纹扩展剩余寿命的研究 Title:StudyonFatigueCrackPropagationandRemainingLifeofVariablePressureAdsorbers Abstract: Variablepressureadsorbers(VPAs)playacriticalroleinvariousindustrialprocesses,includinggasseparation,purification,andstorage.Overtime,thesedevicescandevelopfatiguecracks,impairingtheirperformanceandpotentiallyleadingtounexpectedfailures.Therefore,understandingthefatiguecrackpropagationbehavioranddeterminingtheremaininglifeofVPAsisessentialforensuringtheirsafeandreliableoperation. Thispaperaimstoexploretheresearchonfatiguecrackpropagationandtheremaininglifeofvariablepressureadsorbers.ItbeginsbyintroducingtheconceptofVPAsandtheirsignificanceinindustrialapplications.Additionally,themechanismsoffatiguecrackinitiationandpropagationinVPAsarediscussed,highlightingthefactorsthatinfluencecrackgrowth,suchasstresslevels,materialproperties,andoperatingconditions. Theoreticalmodels,suchastheParislaw,theWalkermodel,andtheDugdale-Barenblattmodel,arereviewedtodescribethecrackpropagationbehaviorandpredictthefatiguelifeofVPAs.Thesemodelsincorporateparameterssuchasstressintensityfactors,cracklengths,andmaterialpropertiestoestimatetherateofcrackgrowthundercyclicloading. ExperimentaltechniquesforstudyingfatiguecrackpropagationinVPAsareexamined.Thisincludesmethodssuchasacousticemissiontesting,finiteelementanalysis,fractography,andfatiguetesting.Thesetechniquesprovidevaluableinsightsintocrackgrowthbehaviorandcanbeusedtovalidatetheaccuracyoftheoreticalmodels. Furthermore,theconceptofremaininglifeassessmentisexplored.Variousapproaches,suchasdamagetoleranceanalysis,crackclosureeffects,andMiner'srule,arediscussedtoestimatetheremaininglifeofVPAsbasedonthecracksizeandgrowthrate.TheimportanceofperiodicinspectionsandmaintenancestrategiesinextendingtheremaininglifeofVPAsisemphasized. ThepaperalsodiscussesthechallengesandlimitationsassociatedwithstudyingfatiguecrackpropagationandremaininglifeinVPAs.Theseincludedifficultiesinaccuratelycharacterizingmaterialproperties,determiningstresslevelsinc