ASTM_F_1572_-_08_2015.pdf

Designation:F157208(Reapproved 2015)Standard Test Methods forTire Performance Testing on Snow and Ice Surfaces1This standard is issued under the fixed designation F1572;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 These test methods cover the evaluation of tire perfor-mance on snow and ice surfaces utilizing passenger car or lighttruck vehicles.Since the tires are evaluated as part of atire/vehicle system,the conclusions reached may not be appli-cable to the same tires tested on a different vehicle.1.2 These test methods do not purport to identify everymaneuver useful for determining tire performance in a winterenvironment.1.3 These test methods are not meant to evaluate vehicleperformance.Allowing for the variability of test results withdifferent vehicles,these procedures have been developed andselected to evaluate relative tire-snow performance.1.4 These test methods are suitable for research and devel-opment purposes,where tires are compared during a singleseries of tests.They may not be suitable for regulatory statutesor specification acceptance because the values obtained maynot necessarily agree or correlate either in rank order orabsolute traction performance level with those obtained underother environmental conditions on other surfaces or the samesurface after additional use.1.5 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.6 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:2E178 Practice for Dealing With Outlying ObservationsE1136 Specification for P195/75R14 Radial Standard Refer-ence Test TireF457 Test Method for Speed and Distance Calibration ofFifth Wheel Equipped With Either Analog or DigitalInstrumentationF538 Terminology Relating to the Characteristics and Per-formance of TiresF811 Practice for Accelerometer Use in Vehicles for TireTestingF1046 Guide for Preparing Artificially Worn Passenger andLight Truck Tires for TestingF1650 Practice for Evaluating Tire Traction PerformanceData Under Varying Test ConditionsF1805 Test Method for Single Wheel Driving Traction in aStraight Line on Snow-and Ice-Covered Surfaces2.2 SAE Standards:3SAE J1466 Passenger Car and Light Truck Tire DynamicDriving Traction in Snow3.Terminology3.1 Definitions:3.1.1 candidate tire,na test tire that is part of a testprogram.3.1.1.1 DiscussionThe term“candidate object”may beused in the same sense as candidate tire.F5383.1.2 candidate tire set,na set of candidate tires.F5383.1.3 control tire,na reference tire used in a specifiedmanner throughout a test program.3.1.3.1 DiscussionAcontrol tire may be of either type andtypical tire use is the reference(control)tire in Practice F1650that provides algorithms for correcting(adjusting)test data forbias trend variations(See Practice F1650 and AnnexA1).F5383.1.4 driving coeffcient(nd),nthe ratio of the drivingforce to a normal force.F5383.1.5 driving force(F),n of a tire,the positive longitudi-nal force resulting from the application of driving torque.F5383.1.6 grooming,vin tire testing,mechanically reworking asnow test surface in order to obtain a surface with moreconsistent properties.F5381These test methods are under the jurisdiction ofASTM Committee F09 on Tiresand are the direct responsibility of Subcommittee F09.20 on Vehicular Testing.Current edition approved May 1,2015.Published June 2015.Originallyapproved in 1994.Last previous edition approved in 2008 as F1572 08.DOI:10.1520/F1572-08R15.2For 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 SAEAutomotive Headquarters,755 W.Big Beaver,Suite 1600,Troy,MI 48084.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.7 ice,dry,nsmooth ice without loose surfacematerials.F5383.1.8 longitudinal force(F),n of a tire,the component ofthe tire force vector in the X direction.F5383.1.9 longitudinal slip velocity(L/T),n the effectiverolling radius multiplied by the difference between the spinvelocity(in rad/unit time)of a driven or braked tire and that ofa free rolling tire when each is traveling in a straight line.F5383.1.10 reference tire,na special tire included in a testprogram;the test results for this tire have significance as a basevalue or internal benchmark.F5383.1.11 snow,hard pack,