ASTM_D_7594_-_11.pdf

Designation:D759411Standard Test Method forDetermining Fretting Wear Resistance of LubricatingGreases Under High Hertzian Contact Pressures Using aHigh-Frequency,Linear-Oscillation(SRV)Test Machine1This standard is issued under the fixed designation D7594;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers a procedure for determining thelubricating action of greases in order to prevent“fretting”wearunder linear oscillation with associated low strokes and highHertzian contact pressures under high-frequency linear-oscillation motion using the SRV test machine.By performingadditional,nonmandatory extreme-pressure tests in accordancewith Test Method D5706,the test grease should be shown to beable to withstand a Hertzian contact pressure of at least2200 MPa without adhesive failure.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A295/A295M Specification for High-Carbon Anti-FrictionBearing SteelD217 Test Methods for Cone Penetration of LubricatingGreaseD4175 Terminology Relating to Petroleum,PetroleumProducts,and LubricantsD5706 Test Method for Determining Extreme PressureProperties of Lubricating Greases Using a High-Frequency,Linear-Oscillation(SRV)Test MachineD6425 Test Method for Measuring Friction and Wear Prop-erties of Extreme Pressure(EP)Lubricating Oils UsingSRV Test MachineD7421 Test Method for Determining Extreme PressureProperties of Lubricating Oils Using High-Frequency,Linear-Oscillation(SRV)Test MachineE45 Test Methods for Determining the Inclusion Content ofSteelG40 Terminology Relating to Wear and Erosion2.2 DIN Standards:3DIN 51834-3:2008-12 Testing of lubricants Tribologicaltest in translatory oscillation apparatus Part 3:Determi-nation of tribological behaviour of materials in coopera-tion with lubricantsDIN 51631:1999 Special-boiling-point spirits-Require-ments and testingDIN EN ISO 683-17 Heat-treated steels,alloy steels andfree-cutting steels-Part 17:Ball and roller bearing steels(replaces DIN 17230-1980)DIN EN ISO 13565-2:1998 Geometrical Product Specifica-tions(GPS)-Surface texture:Profile method-Surfaceshaving stratified functional properties-Part 2:Heightcharacterization using the linear material ratio curve(replaces DIN 4776-1990)3.Terminology3.1 Definitions:3.1.1 break-in,nin tribology,an initial transition processoccurring in newly established wearing contacts,often accom-panied by transients in coefficient of friction or wear rate,orboth,that are uncharacteristic of the given tribological systemslong-term behavior.G403.1.2 coeffcient of friction,or,nin tribology,thedimensionless ratio of the friction force(F)between twobodies to the normal force(N)pressing these bodies together.G401This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.G0.04 on Functional Tests-Tribology.Current edition approved Dec.1,2011.Published March 2012.Originallyapproved in 2010.Last previous edition approved in 2010 as D759410.DOI:10.1520/D7594-11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Available from Beuth Verlag GmbH(DIN-DIN DeutschesInstitut fur Normung e.V.),Burggrafenstrasse 6,10787,Berlin,Germany,http:/www.en.din.de.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.3 Hertzian contact area,napparent area of contactbetween two nonconforming solid bodies pressed against eachother,as calculated from Hertz equations of elasticdeformation.G403.1.4 Hertzian contact pressure,nmagnitude of the pres-sure at any specified location in a Hertzian contact area,ascalculated from Hertzs equations of elastic deformation.TheHertzian contact pressure can also be calculated and reportedas maximum value Pmaxin the centre of the contact or asPaverageas average over the total contact area.D74213.1.5 lubricant,nany material interposed between twosurfaces that reduces the friction or wear between them.D41753.1.6 lubricating grease,na semifluid to solid product ofa dispersion of a thickener in a liquid lubricant.D2173.1.6