Designation:C1863−18StandardTestMethodforHoopTensileStrengthofContinuousFiber-ReinforcedAdvancedCeramicCompositeTubularTestSpecimensatAmbientTemperatureUsingDirectPressurization1ThisstandardisissuedunderthefixeddesignationC1863;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthehooptensilestrength,includingstress-strainresponse,ofcontinuousfiber-reinforcedadvancedceramictubessubjectedtodirectinternalpressurizationthatisappliedmonotonicallyatambienttemperature.Thistypeoftestconfigurationissometimesreferredtoas“tubebursttest.”Thistestmethodisspecifictotubegeometries,becauseflawpopulations,fiberarchitecture,materialfabrication,andtestspecimengeometryfactorsareoftendistinctlydifferentincompositetubes,ascomparedtoflatplates.1.2Inthetestmethod,acompositetube/cylinderwithadefinedgagesectionandaknownwallthicknessisloadedviainternalpressurizationfromapressurizedfluidappliedeitherdirectlytothematerialorthroughasecondarybladderinsertedintothetube.Themonotonicallyapplieduniformradialpres-sureontheinsideofthetuberesultsinhoopstress-strainresponseofthecompositetubethatisrecordeduntilfailureofthetube.Thehooptensilestrengthandthehoopfracturestrengtharedeterminedfromtheresultingmaximumpressureandthepressureatfracture,respectively.Thehooptensilestrains,thehoopproportionallimitstress,andthemodulusofelasticityinthehoopdirectionaredeterminedfromthestress-straindata.Notethathooptensilestrengthasusedinthistestmethodreferstothetensilestrengthinthehoopdirectionfromtheintroductionofamonotonicallyappliedinternalpressurewhere‘monotonic’referstoacontinuousnonstoptestratewithoutreversalsfromtestinitiationtofinalfracture.1.3Thistestmethodappliesprimarilytoadvancedceramicmatrixcompositetubeswithcontinuousfiberreinforcement:unidirectional...
