SAETECHNICAL PAPERSERIES 970658 High-Performance Polymerie Wear TestingforPowertrain Transmissions IanGriffithandDaveKemmish Victrexpic MarianneMorgan VictrexUSAInc. PaulTweedale TheNationalCenterofTribology International Congress &Exposition Detroit,Michigan February24-27,1997 400Commonwealth Drive,Warrendale, PA15096-0001 U.S.A.Tel:(412)776-4841 Fax:(412)776-5760 Downloaded from SAE International by University of New South Wales, Sunday, August 26, 2018Theappearance oftheISSNcodeatthebottomofthispageindicatesSAE'sconsentthat copiesofthepaper maybemade forpersonalorinternaluseofspecificclients.Thisconsent isgivenontheconditionhowever,thatthecopier paya$7.00perarticlecopyfeethrough theCopyrightClearanceCenter,Inc.Operations Center,222Rosewood Drive,Danvers, MA01923forcopyingbeyondthatpermittedbySections107or108oftheU.S.Copyright Law.Thisconsentdoesnotextendtootherkindsofcopyingsuchascopyingforgeneral distribution,for advertisingorpromotional purposes,forcreatingnewcollectiveworks,or forresale. SAEroutinelystocksprintedpapersforaperiodofthreeyearsfollowingdate ofpublication. DirectyourorderstoSAECustomerSalesandSatisfaction Department. QuantityreprintratescanbeobtainedfromtheCustomerSalesandSatisfaction Depart ment. Torequestpermission toreprintatechnicalpaperorpermission tousecopyrighted SAE publications inotherworks,contacttheSAEPublications Group. Nopartofthispublication maybyreproduced inanyform,inanelectronicretrievalsystem orotherwise,withoutthepriorwrittenpermission ofthepublisher. ISSN0148-7191 Copyright1997SocietyofAutomotive Engineers, Inc. Positionsandopinions advancedinthispaperarethoseoftheauthor(s)andnotnecessarily thoseofSAE.Theauthorissolelyresponsible forthecontentofthepaper.Aprocessis availablebywhichdiscussions willbeprintedwiththepaperifitispublished inSAE transactions. Forpermissiontopublishthispaperinfullorinpart,contacttheSAE Publications Group. Personswishingtosubmitpaperstobeconsideredfor presentationor publicationthrough SAEshouldsendthemanuscript ora300wordabstractofaproposedmanuscript to: Secretary,Engineering MeetingsBoard,SAE. PrintedinUSA Downloaded from SAE International by University of New South Wales, Sunday, August 26, 2018970658 High-Performance PolymerieWear TestingforPowertrain Transmissions IanGriffithandDaveKemmish Victrexpic MarianneMorgan VictrexUSAInc. PaulTweedale TheNationalCenterofTribology ABSTRACT Polyaryletherketones (PAEK)andPolyimides (PI)are increasingly usedfordemanding tribological applications, especially inautomotive powertrains. Theparameters that influencethewearrateofthesematerialsarepressure(p), temperature, interfacialvelocity(v),counterfacial roughness, component geometryandlubrication. Usingthegeometry andcounterface definedinthetestingstandardASTMD 3702,ahighvelocitycomparative studyofthesehigh performance engineering polymerswasconducted inan attempttounderstand theeffectsofthepressureandvelocity combination (pv)onwearrate. SCOPE Theobjectiveofthisstudywastodefineanappropriate test standardforevaluating thewearrateofhighperformance polymericmaterialsrelativetoautomotive powertrain conditions. Usingthegeometryandcounterface surfacesdefinedinASTM D-3702,polyaryletherketone (PAEK)andpolyimide (PI) materialsweretestedatninecombinations ofpressureand velocity.Thepressuresandvelocities(PVs)wererepeated multipletimestostatistically determinetheaccuracyand repeatability ofthetestmethod.Also,therequiredbreak-inwear periodwasaccuratelydefined.Usingthepolyaryletherketone astheteststandard,awearmechanism ispostulatedforeachset oftestconditionstoexplainthedifferenceinwearratesasthe velocityandpressuresvary. INTRODUCTION Alargenumberofpublishedstudiescomparing polymeric wearratesarebasedonASTMD3702-78,titled"WearRateof MaterialsinSelf-Lubricated RubbingContactUsingaThrust WasherTestingMachine." Thistestdescribesastandard geometryandtestprotocolthatisconsistentwiththecircular wearmotionthattransmission sealringsandthrustwasher components experienceinservice.Inthebodyofthistestm