1、Designation: F 762/F 762M 08Standard Test Method forDetermining Change in Groove (or Void) Depth WithDistance Traveled for Passenger Car Tires1This standard is issued under the fixed designation F 762/F 762M; the number immediately following the designation indicates the yearof original adoption or,
2、 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 determining the
3、 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 PracticeF 1016.1.3 The values stated in either SI units or i
4、nch-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 does not purpo
5、rt 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:2F 42
6、1 Test Method for Measuring Groove and Void Depthin Passenger Car TiresF 457 Test Method for Speed and Distance Calibration ofFifth Wheel Equipped With Either Analog or DigitalInstrumentationF 538 Terminology Relating to the Characteristics and Per-formance of TiresF 1016 Practice for Linear Tire Tr
7、eadwear Data AnalysisF 1502 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 lead to mor
8、e consistent test results. F 5383.1.2 element, nan isolated (totally bounded by void)projection. F 5383.1.3 groove, na void that is relatively narrow comparedto its length. F 5383.1.4 groove (void) average depth, nthe average depth ofall groove depth measurements in a single groove. F 5383.1.5 groov
9、e (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). F 5383.1.6 irregular wear, na type of treadwear characterizedby substantial variations of trea
10、d loss both from projection toprojection and frequently from point to point on a givenprojection. F 5383.1.7 measurement interval, nthe distance travelled, inkilometres miles, between two successive groove (void)depth measurements. F 5383.1.7.1 DiscussionA specified number of test cycles willconstit
11、ute 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 tire
12、 rotation plan to result in a logical basisfor data interpretation.3.1.8 projection, na pavement contacting area of the treadband, bounded by void. F 5383.1.9 rib, na continuous circumferential projection.F 5383.1.10 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. F 5383.1.10.1 DiscussionTest tires should occupy each positionon the vehicle for the same number of cycles. A tire rotationplan may be designed for each test in a
14、ccordance with therequirement of the test program.3.1.11 test cycle, nin tire testing, one complete circuit ofthe specified test course. F 5381This test method is under the jurisdiction of ASTM Committee F09 on Tiresand is the direct responsibility of Subcommittee F09.30 on Laboratory (Non-Vehicular
15、) Testing.Current edition approved Oct. 1, 2008. Published November 2008. Originallyapproved in 1982. Last previous edition approved in 2000 as F 762 94 (2000)1.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book o
16、f ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.12 tread depth average, n in a single tire, the averageof all tire groove (void)
17、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. F 5384. Summary of Test Method4.1 The tire test procedure is carried out by repeatedlydriving one or more test vehicles ov
18、er 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 specified number of runs over
19、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 test cycles.4.3 The wear
20、 rate may by calculated in a number of ways(see Practice F 1016).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 a variety of qualityassu
21、rance, 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 or absolute tread wearper
22、formance level, with values obtained on other road sur-faces, or on the same surface after additional wear, under otherenvironmental conditions, on other test vehicles, or with resultsobtained by other test procedures.6. Interferences6.1 Vehicles of different types can influence test results.When in
23、volved 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 Tire and Rim Associati
24、on (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 validity of any such patent
25、 rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either
26、 for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hea
27、ring 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 copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).F 762/F 762M 084
