ASTM F1971-2012 Standard Test Method for Electrical Resistance of Tires Under Load On the Test Bench《试验台上负载下轮胎电阻的标准试验方法》.pdf
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1、Designation: F1971 12Standard Test Method forElectrical Resistance of Tires Under Load On the TestBench1This standard is issued under the fixed designation F1971; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last rev
2、ision. 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 test method covers the measurement of the electri-cal resistance between the wheel of a mounted and inflatedtire-wheel as
3、sembly and a flat conducting surface in loadedcontact with the tire.1.2 This test method specifies procedures and equipmentsuch that electrical resistance can be accurately determined fortires with values up to 1012V (ohms).1.3 The values stated in SI units are to be regarded as thestandard. The val
4、ues given in parentheses are for informationonly.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 re
5、gulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2F538 Terminology Relating to the Characteristics and Per-formance of Tires2.2 Other Standards:The Tire and Rim Association Inc. Yearbook (TRA), currentissue3The European Tyre and Rim Technical Organization(ETRTO), current i
6、ssue4The Japan Automobile Tire Manufacturers Association, Inc.Yearbook (JATMA), current issue5International Standard ISO 16392 Electrical ResistanceTest Methods to Measure the Electrical Resistance ofTyres on a Test Rig6Wirtschaftsverband der deutschen Kautschukindustrie e.V.(W.d.K) 110 Measurement
7、of the Electrical Resistance ofTyres3. Terminology3.1 Definitions:3.1.1 connection point, nany point on the wheel or metalloading plate where the resistance measuring instrumentsleads are connected. F5383.1.2 rim, nthe specially shaped circular periphery towhich a tire may be mounted with appropriat
8、e bead fitment.F5383.1.3 test load, nthe force applied to a tire through therim; it is normal to the metal loading plate onto which the tireis loaded. F5383.1.4 tire electrical resistance, nthe electrical resistancein ohms (V) measured between the wheel of a mounted andinflated tire-wheel assembly a
9、nd a metallic plate onto whichthe tire is loaded at a specified load. F5383.1.5 wheel, na rigid structure consisting of a rim con-nected to a central disk that permits rotationally centeredattachment to an axle. F5383.1.6 For additional definitions of terms used in this testmethod, refer to Terminol
10、ogy F538.4. Summary of Test Method4.1 The electrical resistance of an inflated tire-wheel assem-bly (see Note 1) is measured between the wheel and theconducting surface against which the tire is loaded. Thismeasurement involves the use of an appropriate resistancemeter and voltage application system
11、, as well as a special testfixture or measuring stand.NOTE 1A tire mounted on an approved wheel and inflated to aspecified pressure.1This test method is under the jurisdiction of ASTM Committee F09 on Tiresand is the direct responsibility of Subcommittee F09.30 on Laboratory (Non-Vehicular) Testing.
12、Current edition approved May 1, 2012. Published July 2012. Originally approvedin 1999. Last previous edition approved in 2005 as F1971 05. DOI: 10.1520/F1971-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book o
13、f ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from the Tire and Rim Association, Inc., 175 Montrose West Ave.,Suite 150, Copley, OH 44321.4Available from the European Tyre and Rim Technical Organization, 32/2avenue Brugmann, B-1060 Bru
14、ssels, Belgium.5Available from the Japan Automobile Tire Manufacturers Association, No. 33Mori Building, 8thFloor, 3-8-21 Toranomon, Minato-Ku, Tokyo, Japan 105-0001.6Available from International Organization for Standardization (ISO), 1 rue deVaremb, Case postale 56, CH-1211, Geneva 20, Switzerland
15、.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Significance and Use5.1 Occasions exist where static charges on the vehicle mustbe dissipated by way of the tires. Electrical resistance inverselymeasures the tires ability to dissi
16、pate static charge from thevehicle.6. Apparatus6.1 Resistance Measuring Instrument (ohmmeter)Resistance shall be measured by a commercial instrumentcapable of measuring electrical resistance in ohms and havinga power source capable of 1000 V. The voltage shall becontrolled as described in Table 1 an
17、d shall not dissipate morethan 3 W in the test sample. The instrument shall be capable ofdetermining the resistance up to a value of 1012V with anaccuracy of 62 %. The input impedance shall be at least 1016V.6.2 Metal Loading PlateA flat plate of dimensions suffi-cient to encompass the entire contac
18、t surface of the tire undertest and with sufficient thickness to support the test loadsdescribed in Section 8 without visible deformation. This plateshall be made of a conductive noncorrosive metal, for example,brass or stainless steel, free from any coating or obvioussurface contamination, such as
19、oxidation or corrosion. Alumi-num shall not be used for the plate because of its highsusceptibility to the rapid development of surface oxides,which may adversely affect reading accuracy.6.3 Loading ApparatusA loading fixture (Fig. 1) capableof applying the tire load, in a radial direction, against
20、the metalloading plate. Test load measurement accuracy shall be 61%.6.4 Insulating MaterialAsheet of insulating material suchas polyethylene, PTFE (polytetrafluoroethylene), or equivalent,with sufficient strength to support the test loads described inSection 8 without visible deformation. The insula
21、ting materialshould have dimensions of at least 50 mm (2.0 in.) greater, onall sides, than the metal loading plate.6.4.1 With insulating sheet installed between the metalloading plate and the loading apparatus base (Fig. 1), theelectrical resistance between the metal loading plate and theloading app
22、aratus should be at least 1014V. In practice, theelectrical resistance of the plate relative to the loading appa-ratus must be at least two orders of magnitude higher than thetire being measured.6.5 Pressure GageA commercially available gage with anaccuracy of 63 kPa (60.5 psi).7. Conditioning7.1 Fo
23、r at least 8 h prior to measurement of passenger, lighttruck, and motorcycle tire applications (24 h for all other tires),the tire to be tested shall be kept at an ambient temperature of23 6 5C 73 6 9F, and at a relative humidity less than60 %.8. Measurement Conditions8.1 The test load applied durin
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