ASTM E1859 E1859M-2011(2015) Standard Test Method for Friction Coefficient Measurements Between Tire and Pavement Using a Variable Slip Technique《采用可变滑动技术测量轮胎和路面之间摩擦系数的标准试验方法》.pdf
《ASTM E1859 E1859M-2011(2015) Standard Test Method for Friction Coefficient Measurements Between Tire and Pavement Using a Variable Slip Technique《采用可变滑动技术测量轮胎和路面之间摩擦系数的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM E1859 E1859M-2011(2015) Standard Test Method for Friction Coefficient Measurements Between Tire and Pavement Using a Variable Slip Technique《采用可变滑动技术测量轮胎和路面之间摩擦系数的标准试验方法》.pdf(8页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E1859/E1859M 11 (Reapproved 2015)Standard Test Method forFriction Coefficient Measurements Between Tire andPavement Using a Variable Slip Technique1This standard is issued under the fixed designation E1859/E1859M; the number immediately following the designation indicates the yearof ori
2、ginal 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 the measurement of the longi-tudinal f
3、riction coefficient with a measurement device thatimposes braking-slip between a tire and a surface for the fullrange of braking-slip speed values.1.2 This test method utilizes a series of incremental singlemeasurements of friction force on a braked test wheel as it ispulled over a wetted or contami
4、nated pavement surface. Therotational velocity of the braked wheel is feedback controlledin order to give a predetermined variable slip ratio gradient inaccordance with set program parameters. The test wheel is keptunder a constant static normal load and at a constant longitu-dinal speed of travel.
5、Its major plane is perpendicular to theroad plane and parallel to its direction of motion.1.3 The values measured represent the friction propertiesobtained with the equipment and procedures stated in this testmethod and do not necessarily agree or correlate directly withthose obtained by other pavem
6、ent friction measuring methods.1.4 The values are intended for use in:1.4.1 Evaluating the braking friction forces on a pavementrelative to that of other pavements.1.4.2 Evaluating changes in the braking friction forces of aparticular pavement with the passage of time.1.4.3 Evaluating the changes in
7、 the braking friction force ofa pavement when subjected to polishing wear and loss ofmacrotexture caused by traffic with passage of time.1.4.4 Evaluating changes in the braking friction forces of apavement contaminated with ice, moderate amounts2of slushand snow, pollen, vehicle oil spills and conde
8、nsates fromvehicle engine exhaust, and deposits from other pollutionsources.1.4.5 Evaluating the braking friction forces of a specimentire on a clean or contaminated pavement.1.5 The friction values reported by this test method areinsufficient to determine the distance required to stop a vehicleon e
9、ither a dry, wet, or contaminated pavement. They are alsoinsufficient for determining the speed at which control of avehicle would be lost.1.6 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalen
10、ts; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.7 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of thi
11、s standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Specific precau-tionary statements are given in Section 6 and Note 4.2. Referenced Documents2.1 ASTM Standards:3E178 Practice for Dealing With Outlying Observatio
12、nsE274 Test Method for Skid Resistance of Paved SurfacesUsing a Full-Scale TireE501 Specification for Rib Tire for Pavement Skid-Resistance TestsE524 Specification for Smooth Tire for Pavement Skid-Resistance TestsE867 Terminology Relating to Vehicle-Pavement SystemsE1136 Specification for P195/75R1
13、4 Radial Standard Refer-ence Test TireE1551 Specification for Special Purpose, SmoothTreadTire, Operated on Fixed Braking Slip Continuous FrictionMeasuring EquipmentF377 Practice for Calibration of Braking/Tractive MeasuringDevices for Testing Tires1This test method is under the jurisdiction of ASTM
14、 Committee E17 on Vehicle- Pavement Systems and is the direct responsibility of Subcommittee E17.21 onField Methods for Measuring Tire Pavement Friction.Current edition approved Sept. 1, 2015. Published December 2015. Originallyapproved in 1997. Last previous edition approved in 2011 as E1859 11. DO
15、I:10.1520/E1859_E1859M-11R15.2Slush thickness less than 25 mm 1 in. Loose snow thickness less than 50 mm2 in.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 sta
16、ndards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13. Terminology3.1 The terminology used in this test method conforms tothe terminology included in Terminology E867.3.2 Definitions of Term
17、s Specific to This Standard:3.2.1 peak slip friction number, nthe maximum value ofthe slip friction number.3.2.1.1 DiscussionThe peak slip friction number is writtenas SFNpeak(s) where s is the slip speed at which it occurred.3.2.2 slip friction number, nthe quotient of the longitudi-nal friction fo
18、rce in the road plane over the normal load forceat any instant in time and location, multiplied by 100.3.2.2.1 DiscussionThe slip friction number is denoted assfn(t) for instantaneous values in time, or sfn(x) for instanta-neous values in location. The notation SFNcharacteristicspecifiescomputed val
19、ues or the slip friction number at a specifiedcharacteristic.3.2.3 slip speed, nthe difference between the speed of theaxis of the measuring wheel, which is equal to the travelingspeed of the measuring device, and the speed of point on theperimeter of the rotating measuring wheel with undeflectedrad
20、ius, r.3.2.4 slip-to-skid friction number, nthe value of the slipfriction number at which the test wheel reaches zero rotationalspeed during a brake test.3.2.4.1 DiscussionThe slip-to-skid friction number is de-noted SFNskid(v) where v is the vehicle speed v at whichslip-to-skid occurred.3.2.5 slope
21、 indicatorthe rate of change of the slip frictionnumber expressed as an angle near the peak slip frictionnumber.3.2.6 tire longitudinal stiffness indicatorthe rate of changeof the slip friction number expressed as an angle near the zerovalue of the time or location.4. Summary of Test Method4.1 The t
22、est apparatus consists of an automotive vehiclewith one or two independently functioning test wheel systemsincorporated into it. Each test wheel system contains a con-tinuously variable brake system and a pavement wettingsystem. The test wheel is equipped with a standard pavementtest tire, a referen
23、ce tire, or a specimen tire as required forperforming pavement surface measurements or tirecomparisons, respectively. See 5.3 for standard tire references.4.2 The overall system is controlled by a programmablecontrol unit. The proper test control program is selected in thecontrol unit for either pav
24、ement braking friction or tirecomparison between a reference tire and a specimen tire.4.3 The test apparatus is brought to the desired test speed. Acontrolled amount of water is optionally delivered ahead of thetest tire and the braking system is actuated to control the slipratio of the test wheel.A
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