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1、ENGINEERINGTestMethodGMN3943STANDARDSMaterialsScratchandMarResistanceofPlastics,FiveArmTestSmoothSurfaces1ScopeArm#TipLoad(N)Thistestmethoddescribesatestingdeviceand118.0procedureforevaluationofthescratchandmarresistanceofplastics.Fivemetaltips,variably213.0loaded,
2、restnormaltothesurfaceofaMolded-In-38.0Colorplastictestplaqueandaredraggedacrossthedesiredtestarea.43.0Note:Nothinginthistestmethodsupersedesap-50.6plicablelawsandregulationsunlessaspecificexemptionhasbeenobtained.GrainedSurfacesNote:Intheeventofaconflictbetweenthe
3、Englishanddomesticlanguage,theEnglishlanguageshallArm#TipLoad(N)takeprecedence.120.02References215.0Note:Onlythelatestapprovedstandardsareap-310.0plicableunlessotherwisespecified.45.02.1ExternalStandards/Specifications.53.0SAEJ1545Non-standardforcesmaybeemployedatt
4、hedisc---`,,`-`-`,,`,,`,`,,`---2.2GMStandards/Specifications.retionoftheappropriatematerialstandardortestengineer.WeightcanbeloadedontothearminNone.threedifferentpositionsasdesiredasshownbelowinFigure1anddescribedinTable1:3TestEquipmentThebasictestingdevicehasabase
5、andfivemo-vablearmswithmetaltips.Oneendofeacharmisfixedandtheotherendisfittedwithinterchan-geablescratchormarsteeltips,highlypolished,hardenedtoRC48-52.Thetipsare7.0±0.2mmdiameterhemisphereformarand1.0±0.1mmdiameterhemisphereforscratch.Thetipsareloadedwithdifferent
6、weightsexertingthefollowingstandardforcesonasmoothorgrainedsurface:Figure1:WeightPlacementonArm©CopyrightJune2003GeneralMotorsCorporationAllRightsReservedJune2003OriginatingDepartment:NorthAmericanEngineeringStandardsPage1of3CopyrightGeneralMotorsNorthAmericaProvid
7、edbyIHSunderlicensewithGMNoreproductionornetworkingpermittedwithoutlicensefromIHSNotforResaleGMN3943GMENGINEERINGSTANDARDSTable1:Force/MassChartplaquesorregionscutfromplasticpartswhicharesufficientlyflattoprovideforaccurateassessment.Force(N)MassIDPositionof5.3Test
8、Procedure.NeededMassonArm5.3.1Sampleshallbepre-coditionedinacontrolled0.6N00atmosphereof23±3°Cand50±6%relativehu-midityfornotlessthan24hpriortote