Designation:D6991−17´1StandardTestMethodforMeasurementsofInternalStressesinOrganicCoatingsbyCantilever(Beam)Method1ThisstandardisissuedunderthefixeddesignationD6991;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—EditorialcorrectionsweremadeinNote2andNote3inOctober2017.1.Scope1.1Thistestmethodcoverstheprocedureformeasurementsofinternalstressesinorganiccoatingsbyusingthecantilever(beam)method.1.2Thismethodisappropriateforthecoatingsforwhichthemodulusofelasticityofsubstrate(Es)issignificantlygreaterthanthemodulusofelasticityofcoating(Ec)andforwhichthethicknessofsubstrateissignificantlygreaterthanthicknessofcoating(seeNote7andNote8).1.3Thestressvaluesarelimitedbytheadhesionvaluesofcoatingtothesubstrateandbythetensilestrengthofthecoating,orboth.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D823PracticesforProducingFilmsofUniformThicknessofPaint,Varnish,andRelatedProductsonTestPanelsD7091PracticeforNondestructiveMeasurementofDryFilmThicknessofNonmagneticCoatingsAppliedtoFerrousMetalsandNonmagnetic,NonconductiveCoat-ingsAppliedtoNon-FerrousMetals3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1cantilever,n—abea...
