1、Designation: F762/F762M 08 (Reapproved 2014)Standard Test Method forDetermining Change in Groove (or Void) Depth WithDistance Traveled for Passenger Car Tires1This standard is issued under the fixed designation F762/F762M; the number immediately following the designation indicates the yearof origina
2、l adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers a procedure to be used to obtaindata for d
3、etermining the changes in tire tread depth over anyspecified course and test period.1.2 The tire tread depth loss data obtained according to theprocedures for this test method may be used to calculate tiretread wear by way of the procedures described in PracticeF1016.1.3 The values stated in either
4、SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.4 This standard d
5、oes 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 St
6、andards:2F421 Test Method for Measuring Groove and Void Depth inPassenger Car TiresF457 Test Method for Speed and Distance Calibration ofFifth Wheel Equipped With Either Analog or DigitalInstrumentationF538 Terminology Relating to the Characteristics and Per-formance of TiresF1016 Practice for Linea
7、r Tire Treadwear Data AnalysisF1502 Test Method for Static Measurements on Tires forPassenger Cars, Light Trucks, and Medium Duty Vehicles3. Terminology3.1 Definitions:3.1.1 break-in, none or more periods of initial standard-ized tire operation during which tire is brought to the statewhich will lea
8、d to more consistent test results. F5383.1.2 element, nan isolated (totally bounded by void)projection. F5383.1.3 groove, na void that is relatively narrow comparedto its length. F5383.1.4 groove (void) average depth, nthe average depth ofall groove depth measurements in a single groove. F5383.1.5 g
9、roove (void) depth, L, na measurement of theperpendicular distance from a real or calculated reference planedefined by edges of two adjacent ribs or elements to the lowestpoint of contact in the groove (void). F5383.1.6 irregular wear, na type of treadwear characterizedby substantial variations of t
10、read loss both from projection toprojection and frequently from point to point on a givenprojection. F5383.1.7 measurement interval, nthe distance travelled, inkilometres miles, between two successive groove (void)depth measurements. F5383.1.7.1 DiscussionA specified number of test cycles willconsti
11、tute a measurement interval. If a tire rotation plan isspecified, the measurement interval shall include equal dis-tance on each specified wheel position for each tire testspecimen. More frequent measurements may be made ifdesired. The number of measurement intervals should becompatible with the tir
12、e rotation plan to result in a logical basisfor data interpretation.3.1.8 projection, na pavement contacting area of the treadband, bounded by void. F5383.1.9 rib, na continuous circumferential projection. F5383.1.10 rotation plan, n in tire testing, the scheduledchange of wheel positions for all ti
13、res on a vehicle, andbetween vehicles in a convoy, and scheduled change of vehicleposition in a convoy during a road test as appropriate. F5383.1.10.1 DiscussionTest tires should occupy each positionon the vehicle for the same number of cycles. A tire rotation1This test method is under the jurisdict
14、ion of ASTM Committee F09 on Tiresand is the direct responsibility of Subcommittee F09.30 on Laboratory (Non-Vehicular) Testing.Current edition approved June 1, 2014. Published November 2014. Originallyapproved in 1982. Last previous edition approved in 2008 as F762/F762M 08.DOI: 10.1520/F0762_F0762
15、M-08R14.2For 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,
16、PO Box C700, West Conshohocken, PA 19428-2959. United States1plan may be designed for each test in accordance with therequirement of the test program.3.1.11 test cycle, nin tire testing, one complete circuit ofthe specified test course. F5383.1.12 tread depth average, n in a single tire, the average
17、of all tire groove (void) depth measurements.3.1.13 void, na volume (in the tread band) defined by thelack of rubber; the depth dimension of the volume may varyfrom point to point in (on) the tread band. F5384. Summary of Test Method4.1 The tire test procedure is carried out by repeatedlydriving one
18、 or more test vehicles over a specified test course.All tires on each test vehicle are of the same tire sizedesignation: duplicate tires are mounted on each axle. Abreak-in period prior to the measurement program is optional.The tires may be rotated among wheel positions after comple-tion of a speci
19、fied number of runs over the test course. Driversmaintain the same position in the convoy; the vehiclesposition in the convoy is rotated uniformly.4.2 The test consists of a predetermined number of roadtesting cycles. Groove (void) depth measurements are madeafter completion of a specified number of
20、 test cycles.4.3 The wear rate may by calculated in a number of ways(see Practice F1016).5. Significance and Use5.1 The test data obtained with this test method may be usedto compare the performance of various tires for the conditionsunder which they were tested.5.2 This test method is suitable for
21、a variety of qualityassurance, research, and development purposes, when tires areto be compared during a single series of tests. The proceduredescribed may not be suitable for regulatory statutes orspecification acceptance because the values obtained may notagree, or correlate either in rank order o
22、r absolute tread wearperformance level, with values obtained on other roadsurfaces, or on the same surface after additional wear, underother environmental conditions, on other test vehicles, or withresults obtained by other test procedures.6. Interferences6.1 Vehicles of different types can influenc
23、e test results.When involved in comparison testing, avoid mixing of vehicleswith significantly different drivelines or suspensions.7. Apparatus7.1 Test VehicleAny vehicle compatible with test load andtire dimensions.7.2 Rims, of design rim width + 0.5, 0.0 in. for the test tireas recommended by the
24、Tire and Rim Association (T tire; tire groove depth loss; tire test; tripsheetASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the valid
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27、ot received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple co
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