ASTM_F_2869_-_10.pdf

Designation:F286910Standard Practice forRadial Light Truck Tires to Establish Equivalent TestSeverity Between a 1.707-m(67.23-in.)Diameter RotatingRoadwheel and a Flat Surface1This standard is issued under the fixed designation F2869;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 practice describes the procedure to identify equiva-lent test severity conditions between a 1.707-m diameterlaboratory roadwheel surface and a flat or highway surface forradial pneumatic light truck(LT)tires.1.1.1 Tire operational severity,as defined as the running oroperational temperature for certain specified internal tire loca-tions,is not the same for these two test conditions.It istypically higher for the laboratory roadwheel at equal load,speed and inflation pressure conditions due to the curvatureeffect.1.1.2 The practice applies to specific operating conditions oflight truck tires up through load range E for such tires used onvehicles having a gross vehicle weight rating(GVWR)#4536kg(10000 lb).1.1.3 The specific operating conditions under which theprocedures of the practice are valid and useful are completelyoutlined in Section 6,(Limitations)of this standard.1.1.4 It is important to note that this standard is composed oftwo distinct formats:1.1.4.1 The usual text format as published in this volume ofthe Book of Standards(Vol.09.02).1.1.4.2 A special interactive electronic format that uses aspecial software tool,designated as prediction profilers orprofilers.This special profiler may be used to determinelaboratory test conditions that provide equivalent tire internaltemperatures for the belt edge region for the two operationalconditions,that is,the curved laboratory roadwheel and flathighway test surfaces.1.2 The prediction profilers are based on empirically devel-oped linear regression models obtained from the analysis of alarge database that was obtained from a comprehensive experi-mental test program for roadwheel and flat surface testing oftypical radial light truck(LT)tires.See Section 7 and theresearch report2for more details.1.2.1 For users viewing the standard on CD-ROM or PDF,with an active and working internet connection,the profilerscan be accessed on the ASTM website by clicking on the linksin 7.5 and 7.6.1.2.2 For users viewing the standard in a printed format,theprofilers can be accessed by entering the links to the ASTMwebsite in 7.5 and 7.6 into their internet browsers.1.3 For this standard,SI units shall be used,except whereindicated.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:3F414 Test Method for Energy Absorbed by a Tire WhenDeformed by Slow-Moving PlungerF538 Terminology Relating to the Characteristics and Per-formance of TiresF551 Practice for Using a 67.23-in.(1.707-m)DiameterLaboratory Test Roadwheel in Testing TiresF1922 Test Method for Tires,Pneumatic,Vehicular,High-wayF2779 Practice for Commercial Radial Truck-Bus Tires toEstablish Equivalent Test Severity Between a 1.707-m(67.23-in.)Diameter Roadwheel and a Flat SurfaceIEEE/ASTM SI 10 American National Standard for Use ofthe International System of Units(SI):The Modern MetricSystem1This practice is under the jurisdiction of ASTM Committee F09 on Tires and isthe direct responsibility of Subcommittee F09.30 on Laboratory(Non-Vehicular)Testing.Current edition approved Oct.1,2010.Published January 2011.DOI:10.1520/F2869-10.2Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:F09-1002.3For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.Terminology3.1 Definitions:3.1.1 belt edge(BE)temperature,n in the cross section ofa radial tire,the temperature at the edge of the stabilizer pliesor belts,for example,in the rubber region of the two belt edges.3.1.2 contained air temperature,nthe temperature of theair contained within the tire cavity when the tire is mountedand inflated on the proper rim.3.1.3 curved equivalent test severity,nin tire testing,thetest conditions(load,rotational speed,tire inflation pressure)on the flat or highway surface that will provide equivalentinternal tire temperatures,for example,at the belt edge,to aknown set of curved 1.707-m roadwheel surfac