Designation:D7250/D7250M−06(Reapproved2012)StandardPracticeforDeterminingSandwichBeamFlexuralandShearStiffness1ThisstandardisissuedunderthefixeddesignationD7250/D7250M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversdeterminationoftheflexuralandtransverseshearstiffnesspropertiesofflatsandwichconstruc-tionssubjectedtoflexureinsuchamannerthattheappliedmomentsproducecurvatureofthesandwichfacingplanes.Permissiblecorematerialformsincludethosewithcontinuousbondingsurfaces(suchasbalsawoodandfoams)aswellasthosewithdiscontinuousbondingsurfaces(suchashoney-comb).Thecalculationmethodsinthispracticearelimitedtosandwichbeamsexhibitinglinearforce-deflectionresponse.ThispracticeusestestresultsobtainedfromTestMethodsC393/C393Mand/orD7249/D7249M.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.2.1Withinthetexttheinch-poundunitsareshowninbrackets.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C273TestMethodforShearPropertiesofSandwichCoreMaterialsC274TerminologyofStructuralSandwichConstructionsC393/C393MTestMethodforCoreShearPropertiesofSandwichConstructionsbyBeamFlexureD883TerminologyRelatingtoPlasticsD3878TerminologyforCompositeMaterialsD7249/D7249MTestMethodforFacingPropertiesofSand-wichConstructionsbyLongBeamFlexureE6TerminologyRelatingtoMethodsofMechanicalTestingE122PracticeforCalculatingSampleSiz...
