Mechanical Characterization and Modeling of Polymeric Materials for High-pressure Sealing.pdf

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1、MechanicalCharacterizationandModelingofPolymericMaterialsforHigh-pressureSealingbyA.AvanziniABSTRACT--ThechoiceofapropermaterialisprobablytheouterO-ringmadeofelastomericmaterial.lThethermoplas-mostcriticalfactorinthedesignofsealsabletowithstandticringpresentssomeinterferencewiththepistontogeneratee

2、xtremelyhighpressure,andknowledgeofmaterialmechan-acontactpressureattheinterface.TheO-ringitselfisfittedicalpropertiesisessentialforthefinite-elementmodel(FEM)withinterferenceonthesealring,increasingcontactpres-simulationsneededtounderstandandoptimizesealbehav-sureandalsoprovidingsealingattheinterf

3、acebetweensealior.Theaimofthisworkisthemechanicalcharacterizationandcylinder(secondarysealing).Initialinterferenceallowsofpolymericmaterialsforultrahigh-pressuresealingapplica-forthecontactpressurebeinghigherthanthesystempres-tions(600MPa).Afterashortpresentationofsealdesignandmaterialscommonlyused

4、,thetestingoffourthermoplasticsureinthelow-pressureregime.Aspressurebecomeshigher,materialsisdescribed:PA6,H-TPUandUHMWPEreinforcedstressesinthesealbodyincrease,butaboveallthesealingwithglassorceramicmicrospherestoenhancewearresis-mechanismchangesandreliesmoreonthesealdeformationtance.Uniaxialtensi

5、onandcompression,shearandplanarratherthanontheinitialinterference.Ifthesealdesignistensiontestswereperformedaswellasastressrelaxationcorrect,thesealdeformationwillresultinacorrespondingtesttogaininformationaboutviscoelasticeffects.Experimen-contactpressurerisethatisalwayssomewhathigherthanthetaldat

6、aarethendiscussedandelasto--plasticandhypere-systemfluidpressure,aconditionessentialtoavoidleakage.lasticconstitutivemodelsforpolymericmaterialsreviewed,Sealbehaviorisinfluencedbymanyparameters,notonlyfocusingontheapplicationofthesemodelsathighpressure.initialinterference,butalsothesealgeometryandp

7、rofileatTheumodulusandyieldstrengthareverysensitivetotheinterfacewiththepiston,thepositionandshapeofthehydrostaticpressureforpolymericmaterialsandaproposalfortheimplementationintheFEMofthiseffectisillustrat