1、Designation:G20410Standard Test Method forDamage to Contacting Solid Surfaces under FrettingConditions1This standard is issued under the fixed designation G204;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision
2、.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONFretting is small amplitude oscillating motion usually in the range of 10 to 300 m.Contacting solidsurfaces subjected to this type of m
3、otion can develop significant damage in the form of mass loss,pitting,debris generation,etc.Frequently,pitting damage caused by fretting creates stress concentra-tions that contribute to mechanical failures.Most material couples are susceptible to fretting damageand this test method is intended to a
4、ssess a tribocouples relative susceptibility to damage underfretting conditions.When tribocouples experience oscillating relative motion less than about 10 m,gross slip(allpoints in a contact experience relative slip over a complete cycle)may not occur.The elastic behaviorof the real contacts may ac
5、commodate this motion and fretting damage may not occur.When metal couples are subjected to fretting motion,there is a potential for chemical reaction withthe ambient environment to be a component of the damage.In metals rubbing in air,oxidation offreshly fractured surfaces can occur.When chemical r
6、eaction is conjoint with the mechanical damageproduced by fretting,it is called fretting corrosion.When most plastic couples are damaged by frettingmotion,the fractured surfaces may not react with the environment and fretting wear occurs as opposedto fretting corrosion.1.Scope1.1 This test method co
7、vers the studying or ranking thesusceptibility of candidate materials to fretting corrosion orfretting wear for the purposes of material selection for appli-cations where fretting corrosion or fretting wear can limitserviceability.1.2 This test method uses a tribological bench test apparatuswith a m
8、echanism or device that will produce the necessaryrelative motion between a contacting hemispherical rider and aflat counterface.The rider is pressed against the flat counter-face with a loading mass.The test method is intended for usein room temperature air,but future editions could includefretting
9、 in the presence of lubricants or other environments.1.3 The purpose of this test method is to rub two solidsurfaces together under controlled fretting conditions and toquantify the damage to both surfaces in units of volume loss forthe test method.1.4 The values stated in SI units are to be regarde
10、d asstandard.No other units of measurement are included in thisstandard.1.5 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
11、applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2G40 Terminology Relating to Wear and ErosionG99 Test Method for Wear Testing with a Pin-on-DiskApparatusG133 Test Method for Linearly Reciprocating Ball-on-FlatSliding Wear3.Terminology3.1 Definitions:1Th
12、is test method is under the jurisdiction of ASTM Committee G02 on Wearand Erosion and is the direct responsibility of Subcommittee G02.40 on Non-Abrasive Wear.Current edition approved April 1,2010.Published April 2010.DOI:10.1520/G020410.2For referenced ASTM standards,visit the ASTM website,www.astm
13、.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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.1 fretting,nin
14、 tribology,small amplitude oscillatingmotion usually tangential between two solid surfaces incontact.G403.1.2 fretting corrosion,nform of fretting wear in whichcorrosion plays a significant role.G403.1.3 fretting wear,nwear arising as a result of fretting.G403.2 Definitions of Terms Specific to This
15、 Standard:3.2.1 coeffcient of variation(COV),ntest standard devia-tion divided by the test mean.3.2.2 counterface,nflat surface that the rider rubs on inthis test.3.2.3 crater,ncounterface damage in a fretting test from ahemispherical or spherical rider characterized by loss ofmaterial in the form o
16、f a surface depression.3.2.4 fretting amplitude,nsliding distance between direc-tion reversals(for example,if a dial indicator is used tomeasure stroke,the amplitude is the indicator movement on thedial).3.2.5 rider,nball or hemisphere that oscillates on anothersurface to produce fretting damage.3.2.6 scar,ndamage to either rider or counterface in afretting test.4.Summary of Test Method4.1 This test method rubs a spherical or hemispherical solidrider on a solid flat under prescribed conditions t
