ASTM-D5656-复合材料-拉伸载荷剪切作用下厚粘剂金属搭剪连接的应力应变行为测试标准

Designation:D5656−10StandardTestMethodforThick-AdherendMetalLap-ShearJointsforDeterminationoftheStress-StrainBehaviorofAdhesivesinShearbyTensionLoading1ThisstandardisissuedunderthefixeddesignationD5656;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthepreparationandtestingofthick-adherendlap-shearsamplesforthedeterminationofthestress-strainbehaviorofadhesives.1.2Thistestmethodcoversdatareductionandanalysisofstress-straincurvesobtainedusingthick-adherendlap-shearsamples.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Theinch-poundunitsinparenthesesareforinforma-tiononly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Specificprecau-tionarystatementsaregivenin7.3.2.ReferencedDocuments2.1ASTMStandards:2D907TerminologyofAdhesivesD2651GuideforPreparationofMetalSurfacesforAdhesiveBondingD4896GuideforUseofAdhesive-BondedSingleLap-JointSpecimenTestResultsE4PracticesforForceVerificationofTestingMachines3.Terminology3.1Definitions:3.1.1ManytermsinthistestmethodaredefinedinTermi-nologyD907.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1knee,n—inflectionpointonaload-deflectioncurve;thepointatwhichplasticyieldingoftheadhesivebeginstodominatethedeformationresponseoftheload-deflectioncurve.3.2.2panel,n—twoplatesofarigidmaterialhavingthesamedimensionsthatareadhesivelybondedtogetherononefacesuchthatthethicknessofthepanelisapproximatelytwicethethicknessofeachindividualplate.4.SummaryofTestMethod4.1Thistestmethodconsistsoftestingthick-adherendlap-shearsampleswherebyatensileloadisappliedtothesamplebuttheadhesiveisplacedinshear.UnlikeGuideD4896,theadherendsusedinthisstandardtestmethodarethickandrigid,peelforcesareminimizedandtheshearstress-strainpropertiesoftheadhesiveareobtained.Refer-enceddatapresentsafiniteelementanalysisofthethick-adherentmetallapshearspecimenandcalculatestheeffectofvaryingtheadherentandadhesivestiffness.3Userofthisstandardiscautionedthatsincethestressisnottotallyuniformacrosstheover-lapofthespecimen,factorssuchasadhesivestiffness,adherentstiffnessandlocationofshearstrainmea-surementalongthelengthofthebondcanaffecttheexperi-mentallyobtainedload-displacementcurve.3,4NOTE1—Thepeelforcesgeneratedduringtestingareafunctionofthebendingdeformationintheadherends.Greateradherendstiffnessresultsinlessbendingandsmallerpeelforces.5.SignificanceandUse5.1Thistestmethodcanbeusedtodeterminethestress-strainpropertiesofanadhesiveinshearandtoestablishtheproportional-limitofthestress-stainrelationship.Thisdatamaybeusefulforthedesignandanalysisofadhesivelybondedjoints.1ThistestmethodisunderthejurisdictionofASTMCommitteeD14onAdhesivesandisthedirectresponsibilityofSubcommitteeD14.80onMetalBondingAdhesivesCurrenteditionapprovedOct.1,2010.PublishedOctober2010.Originallyapprovedin1995.Lastpreviouseditionapprovedin2004asD5656-04´1.DOI:10.1520/D5656-10.2ForreferencedASTMstandards,visittheASTMwebsite,@astm.org.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandard’sDocumentSummarypageontheASTMwebsite.3Kassapoglou,C.andAdelmann,JohnC.,“KGR-1ThickAdherendSpecimenEvaluationfortheDeterminationofAdhesiveMechanicalProperties,”23rdInternationalSAMPEConference,Oct.21–24,1991.4Krieger,R.B.,Jr.,“StiffnessCharacteristicsofStructuralAdhesivesforStressAnalysisinHostileEnvironment,”AmericanCyanamidCo.,HavredeGrace,MD,1975.Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959.UnitedStates15.2Thistestmethodisnotintendedtodetermineadhesioncharacteristicsofanadhesivetoaparticularsubstrate;ratherthistestmethodisintendedtocharacterizetheadhesiveshearstress-strainpropertiesthatmayberelevantfordesignconsid-erations.5.3Thistestmethodhasbeendevelopedandappliedusingbondedaluminumadherends.Atthistimenoassumptionsregardingthevalidityofthistestmethodwithnon-aluminumadherendscanbemade.6.Apparatus6.1TestingmachineconformingtotherequirementsofPracticesE4.Selectthetestingmachinesothatthebreakingloadofthespecimensfallsbetween15and85%ofthefull-scalecapacity.Ensurethatthemachineiscapableofmaintainingarateofloadingof2455N(550lbf)/min,or,iftherateisdependentoncross-headmotion,setthemachinetoapproachthisrateofloading.Useasuitablepairofself-aligninggripstoholdthespecimen.Ensurethatthegripsandattachmentsaresoconstructedthattheywillmoveintoalignmentwiththetestspecimenassoonastheloadisapplied,sothatthelongaxisofthetestspecimenwillcoincidewiththedirectionoftheappliedpullthroughthecenterlineofthegripassembly.NOTE2—Thecross-headspeedsettingrequiredtoapproachthespecifiedloadingrateisdependentonthemodulusoftheadherendsandtheadhesivebeingevaluated.6.2Usetwothree-pointdi