ASTM_F_2803_-_09_2015.pdf

Designation:F280309(Reapproved 2015)Standard Test Method forEvaluating Rim Slip Performance of Tires and Wheels1This standard is issued under the fixed designation F2803;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.Scope1.1 This test method is performed to determine the amountof rotational slip occurring at the tire/wheel interface whileunder heavy longitudinal load conditions.1.2 This test method is suitable for research and develop-ment purposes where tires are compared during a single seriesof tests.They may not be suitable for regulatory statutes orspecification acceptance because the values obtained may notnecessarily agree or correlate either in rank order or absoluteperformance level with those obtained under other environ-mental conditions on other surfaces or the same surface afteradditional use.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.4 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:2F538 Terminology Relating to the Characteristics and Per-formance of Tires2.2 SAE Standards:3SAE J2013 Military Tire GlossarySAE J670e Vehicle Dynamics Terminology3.Terminology3.1 Definitions:3.1.1 bead,nof a tire,the part of a tire that comes incontact with the rim and is shaped to secure the tire to the rim.F5383.1.2 candidate tire,ntest tire that is part of a testprogram.F5383.1.3 control tire,nreference tire used in a specifiedmanner throughout a test program.F5383.1.4 deflection,ndifference between the unloaded andloaded section heights.SAE J20133.1.5 drawbar,ndevice for coupling a hauling vehicle to aload.3.1.6 dynamometer,nmachine used to measure torque androtational speed(rpm)from which power produced by anengine,motor or other rotating prime mover can be calculated.3.1.6.1 DiscussionFor the purpose of this test method,adynamometer can be any vehicle or trailer that can be towedand produce longitudinal resistance.3.1.7 longitudinal force,nof a tire,the component of thetire force vector in the X direction.F5383.1.8 longitudinal slip velocity L/T,neffective rollingradius multiplied by the difference between the spin velocity(in rad/unit time)of a driven or braked tire and that of a freerolling tire when each is traveling in a straight line.F5383.1.9 maximum load rating M,nof a passenger tire,theload rating at the maximum permissible cold inflation pressurefor that tire.F5383.1.10 paved road,ntwo or more lanes,all weather,maintained,hard surface roads with good driving visibilityused for heavy and high-density traffic,in accordance with theU.S.Federal Highway Administration.F5383.1.11 rim,nspecially shaped circular periphery to whicha tire may be mounted with appropriate bead fitment.F5383.1.12 rim slip,ncircumferential distance along the rimflange between the corresponding marks.3.1.13 section height,nradial height of a tire section,expressed as one half the difference between the outsidediameter of the unloaded tire and the nominal rim diameter;theoutside diameter is measured on a tire-wheel assembly with thetire inflated to rated inflation pressure.F5381This test method is under the jurisdiction of ASTM Committee F09 on Tiresand is the direct responsibility of Subcommittee F09.20 on Vehicular Testing.Current edition approved May 1,2015.Published June 2015.Originallyapproved in 2009.Last previous edition approved in 2009 as F2803 09.DOI:10.1520/F2803-09R15.2For 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 SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096-0001,http:/www.sae.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.14 sidewall,nof a tire,that portion of a tire betweenthe tread and the bead.F5383.1.15 test,ntechnical procedure performed on an object(or set of objects)using specified equipment,that producesdata,which are used to evaluate or model selected properties orcharacteristics of the object(or set of objects).F5383.1.16 test tire,ntire used in a test.F5383.1.17 torque FL,nof a wheel,the external torqueapplied to a tire from a vehicle about the wheel spin axis.F5383.1.18 tractive effort,ntotal force output of the tractiondevice acting parallel to the surface of the ground and in thedirection of travel of a driving wheel.3.1.18.1