Designation:D4170−10StandardTestMethodforFrettingWearProtectionbyLubricatingGreases1ThisstandardisissuedunderthefixeddesignationD4170;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodevaluatesthefrettingwearprotectionprovidedbylubricatinggreases.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Otherunitsareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecificwarningstatements,see7.2and9.2.2.ReferencedDocuments2.1ASTMStandards:2TestMethodsforRatingMotor,Diesel,andAviationFuels;MotorFuels(SectionI),ReferenceMaterialsandBlend-ingAccessories(Annex2),ReferenceFuels(A2.7.3.3),andTable32(Specificationforn-HeptaneMotorFuel)2.2MilitaryStandard:3MIL-S-22473DSealing,LockingandRetainingCompounds,Single-Component3.Terminology3.1Definitions:3.1.1frettingwear,n—aformofattritivewearcausedbyvibratoryoroscillatorymotionoflimitedamplitudecharacter-izedbytheremovaloffinely-dividedparticlesfromtherubbingsurfaces.43.1.1.1Discussion—Aircancauseimmediatelocaloxida-tionofthewearparticlesproducedbyfrettingwear.Inaddition,environmentalmoistureorhumiditycanhydratetheoxidationproduct.Inthecaseofferrousmetals,theoxidizedweardebrisisabrasiveironoxide(Fe2O3)havingtheappear-anceofrust,whichgivesrisetothenearlysynonymousterms,frettingcorrosionandfrictionoxidation.Arelated,butsome-whatdifferentphenomenonoftenaccompaniesfrettingwear.Falsebrinellingislocalizedfrettingwearthatoccurswhentherollingelementsofabearingvibrateoroscillatewithsmallamplitudewhilepressedagainstthebearingrace.Themecha-nismproceedsinstages:(1)asperitiesweld,aretornapart,andfo...
