Designation:D2981−94(Reapproved2014)StandardTestMethodforWearLifeofSolidFilmLubricantsinOscillatingMotion1ThisstandardisissuedunderthefixeddesignationD2981;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheevaluationofwearlifeofabondedsolidfilmlubricantunderoscillatingmotionbymeansofablock-on-ring2frictionandweartestingmachine.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3D2714TestMethodforCalibrationandOperationoftheFalexBlock-on-RingFrictionandWearTestingMachine3.Terminology3.1Definitions:3.1.1coeffıcientoffriction,µorf—intribology,thedimen-sionlessratioofthefrictionforce(F)betweentwobodiestothenormalforce(N)pressingthesetwobodiestogether.µorf5~F/N!(1)3.1.1.1Discussion—Adistinctionisoftenmadebetweenstaticcoeffıcientoffrictionandkineticcoeffıcientoffriction.3.1.2frictionforce—theresistingforcetangentialtotheinterfacebetweentwobodieswhen,undertheactionofanexternalforce,onebodymovesortendstomoverelativetotheother.3.1.3kineticcoeffıcientoffriction—thecoefficientoffric-tionunderconditionsofmacroscopicrelativemotionbetweentwobodies.3.1.4wear—damagetoasolidsurface,generallyinvolvingprogressivelossofmaterial,duetorelativemotionbetweenthatsurfaceandacontactingsubstanceorsubstances.4.SummaryofTestMethod4.1Thetestmachineisoperatedusingacoatedsteeltestingringoscillatingagainstasteeltestblock.Theoscillatingspeedis87.561cpmata90°arc.Thespecimensareworn-infor1minat13.6kg(30lb)normalloadobtainedbyapplicationof0.454kg(1lb)ofdeadweighttothe0:1ratioleversystem.Wear-inisfollowedbyapplicationofanormallo...
