gmw-3155-2002

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1、WORLDWIDETestProcedureENGINEERINGGMW3155LaboratorySTANDARDSThermalCyclingTestforLifeAssessmentofPowertrainSealingSystems1.2.4Beforeinitiallyrunningthistestprocedure,1Scopetheoperatorshallrun1.2.4.2toverifysufficientinitialsealingofthejoint.AirleakintegrityNote:Nothinginthistestmet

2、hodsupersedesap-(1.2.4.1)ofthefixtureisspecifiedbytheplicablelawsandregulationsunlessaspecificrequester.Additionalchecksonlatecomponentexemptionhasbeenobtained.changesareattherequestersoroperatorsdiscretion.Note:IntheeventofaconflictbetweentheEng-lishanddomesticlanguage,theEnglish

3、language1.2.4.1Airleaktesttoensurethattheassembliesshalltakeprecedence.havesufficientsealingintegrity(GMW3149).Thismaybeconductedbefore,during,andafterthe1.1Purpose.thermalcyclingtest.1.1.1Thistestisusedtopredictthelifeof1.2.4.2Qualitativemeasurementofthesealingpowertrainsealingas

4、itappliestotheintendedforcedistribution.Forstaticforcedistributionsystemdesign.Thesystemincludesthegasket,measurements,useGMW3152.Fordynamicforcefasteners,structuralinterfacesandcirculatingdistributionmeasurement(pressuremapping)usemedia.TestfixturesarecycledthroughhotandGMW3137.c

5、oldtemperatureextremesoveraperiodofupto25weeks.Timetofailure(definedbymedia1.2.5ThevaluesstatedineitherSIunitsorleakage)istheperformancemeasure.See1.4.3.Englishunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemshall1.1.2Thistestisusedoncomponentsandbeusedindepend

6、entlyoftheother.Combiningassemblies(uptoentirepowertrains)toidentifyvaluesfromthetwosystemsmayresultinandeliminatepoorsealdesignsand/ormaterials.nonconformancewiththetestprocedure.Designhasasignificantinfluenceontestresults.1.3Applicability.1.1.3Thetestestablishesanoleakageperform

7、ancerequirementasitrelatestocustomer1.3.1Thistestissuitedtotheevaluationofallmilesandpowertrainobjectives(h).Seeleakstaticpowertraingasketsandsealsthatdefinition,1.4.3.experiencethermalcyclingduringserviceinEuropeanandNAOpassengervehicleandlight1.1.4Itservesasadevelopmentorvalidat

8、iontest.dutytruckapplications.Oth