Designation:D6416/D6416M−01(Reapproved2012)StandardTestMethodforTwo-DimensionalFlexuralPropertiesofSimplySupportedSandwichCompositePlatesSubjectedtoaDistributedLoad1ThisstandardisissuedunderthefixeddesignationD6416/D6416M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddeterminesthetwo-dimensionalflex-uralpropertiesofsandwichcompositeplatessubjectedtoadistributedload.Thetestfixtureusesarelativelylargesquarepanelsamplewhichissimplysupportedallaroundandhasthedistributedloadprovidedbyawater-filledbladder.ThistypeofloadingdiffersfromtheprocedureofTestMethodC393,whereconcentratedloadsinduceone-dimensional,simplebendinginbeamspecimens.1.2Thistestmethodisapplicabletocompositestructuresofthesandwichtypewhichinvolvearelativelythicklayerofcorematerialbondedonbothfaceswithanadhesivetothin-facesheetscomposedofadenser,higher-modulusmaterial,typically,apolymermatrixreinforcedwithhigh-modulusfibers.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Withinthetexttheinch-poundunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C274TerminologyofStructuralSandwichConstructionsC365/C365MTestMethodforFlatwiseCompressiveProp-ertiesofSandwichCoresC393TestMethodforFlexuralPropertiesofSandwichConstructionsD792TestMethodsforDensityandSpecificGravity(Rela-tiveDensity)ofPlasticsbyDisplacementD2584TestMeth...
