Designation:D6790/D6790M−14StandardTestMethodforDeterminingPoisson’sRatioofHoneycombCores1ThisstandardisissuedunderthefixeddesignationD6790/D6790M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthesand-wichhoneycombcorePoisson’sratiofromtheanticlasticcurvatureradii,seeFig.1.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.2.1Withinthetext,theinch-poundunitsareshowninbrackets.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C271/C271MTestMethodforDensityofSandwichCoreMaterialsC274TerminologyofStructuralSandwichConstructionsD883TerminologyRelatingtoPlasticsD3878TerminologyforCompositeMaterialsD5229/D5229MTestMethodforMoistureAbsorptionProp-ertiesandEquilibriumConditioningofPolymerMatrixCompositeMaterialsE122PracticeforCalculatingSampleSizetoEstimate,WithSpecifiedPrecision,theAverageforaCharacteristicofaLotorProcessE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE456TerminologyRelatingtoQualityandStatisticsE1309GuideforIdentificationofFiber-ReinforcedPolymer-MatrixCompositeMaterialsinDatabasesE1434GuideforRecordingMechanicalTestDataofFiber-ReinforcedCompositeMaterialsinDatabases3.Terminology3.1Definitions—TerminologyD3878definestermsrelatingtohigh-modulusfibersandtheircomposites.TerminologyC274definestermsrelatingtostructuralsandwichconstruc-tions.Termi...
