ASTM_F_1650_-_98_2014e1.pdf

Designation:F165098(Reapproved 2014)1Standard Practice forEvaluating Tire Traction Performance Data Under VaryingTest Conditions1This standard is issued under the fixed designation F1650;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.1NOTEEditorially corrected Subsection X2.4 in April 2014.INTRODUCTIONTire traction testing programs at proving grounds or other exterior test sites are often extended overa period of days or weeks.During this time period test conditions may change due to a number ofvarying factors,for example,temperature,rain or snow fall,surface texture,water depth,and windvelocity and direction.If tire performance comparisons are to be made over any part of the testprogram(or the entire program)where these test condition variations are known or suspected to affectperformance,the potential influence of these variations must be considered in any final evaluation oftraction performance.1.Scope1.1 This practice covers the required procedures for exam-ining sequential control tire data for any variation due tochanging test conditions.Such variations may influence abso-lute and also comparative performance of candidate tires,asthey are tested over any short or extended time period.Thevariations addressed in this practice are systematic or biasvariations and not random variations.See Appendix X1 foradditional details.1.1.1 Two types of variation may occur:time or testsequence“trend variations,”either linear or curvilinear,and theless common transient or abrupt shift variations.If anyobserved variations are declared to be statistically significant,the calculation procedures are given to correct for the influenceof these variations.This approach is addressed in Method A.1.2 In some testing programs,a policy is adopted to correctall candidate traction test data values without the application ofa statistical routine to determine if a significant trend or shift isobserved.This option is part of this practice and is addressedin Method B.1.3 The issue of rejecting outlier data points or test valuesthat might occur among a set of otherwise acceptable datavalues obtained under identical test conditions in a short timeperiod is not part of this practice.Specific test method or otheroutlier rejection standards that address this issue may be usedon the individual data sets prior to applying this practice and itsprocedures.1.4 Although this practice applies to various types of tiretraction testing(for example,dry,wet,snow,ice),the proce-dures as given in this practice may be used for any repetitivetire testing in an environment where test conditions are subjectto change.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 applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E501 Specification for Rib Tire for Pavement Skid-Resistance TestsE524 Specification for Smooth Tire for Pavement Skid-Resistance TestsE826 Practice for Testing Homogeneity of a Metal Lot orBatch in Solid Form by Spark Atomic Emission Spec-trometryE1136 Specification for P195/75R14 Radial Standard Refer-ence Test Tire1This practice is under the jurisdiction of ASTM Committee F09 on Tires and isthe direct responsibility of Subcommittee F09.20 on Vehicular Testing.Current edition approved Jan.1,2014.Published February 2014.Originallyapproved in 1995.Last previous edition approved in 2005 as F1650 98(2005).DOI:10.1520/F1650-98R14E01.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 F538 Terminology Relating to the Characteristics and Per-formance of Tires3.Terminology3.1 Descriptions of Terms Specific to This StandardDescriptions of terms particular to this practice are listed eitheras principal terms or under principal terms as derived terms.3.2 Discussion:3.2.1 The terminology in this section is currently underreview by Subcommittee F09.94 on Terminology.This termi-nology is subject to change and should be considered tentative.3.2.2 candidate tire(set),na test tire(or test tire set)thatis part of an evaluation program;each candidate tire(set)usually has certain unique design or other features that distin-guish it from other candidate tires in the program.3.2.3 control tire(set),na reference tire(or reference set)repeatedly tested in a specified sequence throughout an evalu-ation program,that is used