Designation:D2291/D2291M−22StandardPracticeforFabricationofRingTestSpecimensforGlass-ResinComposites1ThisstandardisissuedunderthefixeddesignationD2291/D2291M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thispracticeisintendedforuseinthefabricationofring-typetestspecimenstobeusedintheevaluationofthemechanicalpropertiesofreinforcementandresinsinacom-positestructure.Thepracticeoutlinesthestepsintheprepara-tionofthetestspecimens,includingthefinalspecimenmachiningwhereapplicable.Threefinalringconfigurationsareincluded.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.NOTE1—ThereisnoknownISOequivalenttothispractice.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD883TerminologyRelatingtoPlasticsD2290TestMethodforApparentHoopTensileStrengthofPlasticorReinforcedPlasticPipeD2344/D2344MTestMethodforShort-BeamStrengthofPolymerMatrixCompositeMaterialsandTheirLaminates3.Terminology3.1Fordefinitionsoftermsw...
