Designation:D2714−94(Reapproved2014)StandardTestMethodforCalibrationandOperationoftheFalexBlock-on-RingFrictionandWearTestingMachine1ThisstandardisissuedunderthefixeddesignationD2714;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthecalibrationandoperationofablock-on-ringfrictionandweartestingmachine.1.2ThevaluesinSIunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.Terminology2.1Definitions:2.1.1coeffıcientoffriction,µorf—intribology,thedimen-sionlessratioofthefrictionforce(F)betweentwobodiestothenormalforce(N)pressingthesetwobodiestogether.µorf5~F/N!(1)2.1.1.1Discussion—Adistinctionisoftenmadebetweenstaticcoeffıcientoffrictionandkineticcoeffıcientoffriction.2.1.2frictionforce—theresistingforcetangentialtotheinterfacebetweentwobodieswhen,undertheactionofanexternalforce,onebodymovesortendstomoverelativetotheother.2.1.3kineticcoeffıcientoffriction—thecoefficientoffric-tionunderconditionsofmacroscopicrelativemotionbetweentwobodies.2.1.4wear—damagetoasolidsurface,generallyinvolvingprogressivelossofmaterial,duetorelativemotionbetweenthatsurfaceandacontactingsubstanceorsubstances.3.SummaryofTestMethod3.1Thetestmachineisoperatedusingasteeltestringrotatingagainstasteeltestblock,thespecimenassemblybeingpartiallyimmersedinthelubricantsample.Thevelocityofthetestringis7.960.16m/min(2660.52ft/min)whichisequivalenttoaspindlespeedof7261rpm.Thesp...
