Designation:C1819−15StandardTestMethodforHoopTensileStrengthofContinuousFiber-ReinforcedAdvancedCeramicCompositeTubularTestSpecimensatAmbientTemperatureUsingElastomericInserts1ThisstandardisissuedunderthefixeddesignationC1819;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthehooptensilestrengthincludingstress-strainresponseofcontinuousfiber-reinforcedadvancedceramictubessubjectedtoaninter-nalpressureproducedbytheexpansionofanelastomericinsertundergoingmonotonicuniaxialloadingatambienttempera-ture.Thistypeoftestconfigurationissometimesreferredtoasanoverhungtube.Thistestmethodisspecifictotubegeometries,becauseflawpopulations,fiberarchitectureandspecimengeometryfactorsareoftendistinctlydifferentincompositetubes,ascomparedtoflatplates.1.2Inthetestmethodacompositetube/cylinderwithadefinedgagesectionandaknownwallthicknessisloadedviainternalpressurizationfromtheradialexpansionofanelasto-mericinsert(locatedmidwayinsidethetube)thatislongitu-dinallycompressedfromeitherendbypushrods.Theelasto-mericinsertexpandsundertheuniaxialcompressiveloadingofthepushrodsandexertsauniformradialpressureontheinsideofthetube.Theresultinghoopstress-strainresponseofthecompositetubeisrecordeduntilfailureofthetube.Thehooptensilestrengthandthehoopfracturestrengtharedeterminedfromtheresultingmaximumpressureandthepressureatfracture,respectively.Thehooptensilestrains,thehoopproportionallimitstress,andthemodulusofelasticityinthehoopdirectionaredeterminedfromthestress-straindata.Notethathooptensilestrengthasusedinthistestmethodreferstothetensilestrengthinthehoopdirectionfromtheinducedpressureofamonotonic,uniaxially-loadedelastomericinsertwheremonotonicreferstoacontinuousnonstoptestratewithoutreversalsfromtestinitiationtofinalfracture.1.3Thistestme...
