ASTM标准.D3164M

5.Apparatus

5.1TestingMachine,conformingtotherequirementsofandhavingthecapabilitiesofthemachineprescribedinTestMethodD1002.Likewisethegripsarecapableofsecurelygraspingthespecimenthroughoutthetestwithoutallowingthespecimentoslip.Thegripsarealsoself-aligning.

5.2Temperature-ControllingEquipment,capableofmain-tainingthetesttemperatureto63°C.Ifambientlaboratoryconditionsareemployedthesamedegreeofcontrolisrequired.6.TestSpecimen

6.1Makespecimensthatconformtotheformanddimen-sionsshowninFig.1.ItisrecommendedthatthetestspecimensbecutfromthetestpaneldepictedinFig.2,butindividualspecimensmaybepreparedifpreferred.Therec-ommendedmetalsubstrateisAlloy2024-T3aluminum,1.560.1mm.AsurfacetreatmentsuchasMethodAofPracticeD2651isrecommendedforthealuminum.Ifametalsubstrateotherthanaluminumisemployed,thenoneoftheothersurfacepreparationsinPracticeD2651issuggested.Therecom-mendedlengthofoverlapis12.560.2mm.Thethicknessof

theplasticinthemetal/adhesive/plastic/adhesive/metalsand-wichconfigurationmayvarydependingonthetypeandmanufacturerbutthinfilmsof0.35mmorlessarerecom-mended.Anupperlimitof1.560.1mmplasticthicknessissuggested.

6.2Thesurfacepreparationusedontheadherenddependsonthesubjectplasticadherend.Methodssuchasthoserecom-mendedinPracticeD2093serveasausefulguide.

6.3Applytheadhesiveinaccordancewiththemanufactur-er’srecommendations.Choosetheadhesivesuchthatthecuretemperaturedoesnotadverselyaffectthemechanicalproper-tiesoftheadherend.

6.4CuttestspecimensfromthebondedpanelspicturedinFig.2.Cuttingthespecimensmustbeaccomplishedwithoutoverheatingorotherwisephysicallydamagingtheadherendorbondedinterface.Individualtestspecimensmayalsobepreparedifdesired.

7.Procedure

7.1Conditionthetestspecimensfordefiniteperiodsoftimeunderspecifiedconditionsbeforetestingifdesired.Afterconditioning,itisrecommendedthatallspecimensbestabi-lizedinthetestenvironmentfor1hbeforetesting.

7.2Placethetestspecimensinthegripsofthetestingmachinesothattheappliedloadcoincideswiththelongaxisof

FIG.1FormA—DimensionsofTestSpecimen

FIG.2StandardTestPanel

thespecimen.Loadthespecimentofailureatarateof80to100kg/cm2ofshearareaperminute.

NOTE2—Thethicknessoftheplasticinsertusedwillinfluencethejointstrengthsobtainedinthistestduetotheaddedoffset.Thermalstressesintroducedinthejointbyelevatedtemperaturesbondingdissimilarmaterialswillalsooffsetultimatejointstrength.Directcomparisonofresultsispossibleonlyforthesamethicknessandcompositionofinsertsoastominimizedifferencesresultingfromoffsetorthermalstress.

8.Calculations

8.1Calculatethebondareatothenearest0.05cm2.Recordbothloadatfailureandtypeoffailure(percentagecohesiveandapparentfailureinadhesion).Calculatefailingstressasmegapascalsofsheararea.

9.Report

9.1Reportthefollowing:

9.1.1Completeidentificationoftheadhesivetested,includ-ingtype,source,datemanufactured,manufacturer’scodenumber,form,etc.

9.1.2Completeidentificationofthemetalused,itsthick-ness,andmethodofcleaningandpreparingitssurfacepriortobonding.

9.1.3Completeidentificationoftheplasticused,itsthick-ness,andthemethodofcleaningandpreparingitssurfacepriortobonding.

9.1.4Methodofadhesiveapplication(brush,spray,rollercoat,tape,etc.).

9.1.5Ambientconditionsattimeofbonding(temperature,humidity,etc.).

9.1.6Lengthofoverlapused.

9.1.7Conditioningofjointpriortotesting.

9.1.8Maximum,minimum,andaveragevaluesofthefail-ingload.

9.1.9Numberofspecimenstested.

9.1.10Typeoffailure.Thisshouldincludeestimatedper-centagesofcohesivefailureintheadhesiveunbondedarea,apparentfailureinadhesion,andfailureintheadherend.9.1.11Testtemperatureemployed.

9.1.12Theaveragethicknessofadhesivelayerafterforma-tionofthejointshallbereportedwithin0.01mm.Themethodofobtainingthethicknessoftheadhesivelayershallbedescribedincludingprocedure,locationofmeasurementsandrangeofmeasurements.10.PrecisionandBias

10.1Aprecisionandbiasstatementdoesnotexistforthistestmethodbecauseresourcesnecessaryforroundrobintestinghavenotbeenforthcoming.

11.Keywords

11.1adhesivebond;lap-shear;sandwichjoint;shear;ten-sion

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