ASTM-F1649:2003 Edition

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F1649-96(2003) Standard Test Methods for Evaluating Wet Braking Traction Performance of Passenger Car Tires on Vehicles Equipped with Anti-Lock Braking Systems

Published By	Publication Date	Number of Pages
ASTM	2003	12

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Categories: 43.040.40 - Braking systems, ASTM

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Description

ASTM F1649-96-Reapproved2003

Historical Standard: Standard Test Methods for Evaluating Wet Braking Traction Performance of Passenger Car Tires on Vehicles Equipped with Anti-Lock Braking Systems (Withdrawn 2012)

ASTM F1649

Scope

1.1 These test methods cover the measurement of two types of ABS vehicle behavior that reflect differences in tire wet traction performance when the vehicle is fitted with a series of different tire sets to be evaluated.

1.1.1 The stopping distance from some selected speed at which the brakes are applied.

1.1.2 The lack of control of the vehicle during the braking maneuver. Uncontrollability occurs when the vehicle does not follow the intended trajectory during the period of brake application despite a conscious effort on the part of a skilled driver to maintain trajectory control. Uncontrollability is measured by a series of parameters related to this deviation from the intended trajectory and the motions that the vehicle makes during the stopping maneuver.

1.1.3 Although anti-lock braking systems maintain wheel rotation and allow for a high degree of trajectory control, different sets of tires with variations in construction, tread pattern, and tread compound may influence the degree of trajectory control in addition to stopping distance. Thus vehicle uncontrollability is an important evaluation parameter for tire wet traction performance.

1.2 These test methods specify that the wet braking traction tests be conducted on two specially prepared test courses: (1) a straight-line (rectilinear) “split-μ” (μ=friction coefficient) test course, with two test lanes deployed along the test course (as traveled by the test vehicle); the two lanes have substantially different friction levels such that the left pair of wheels travels on one surface while the right pair of wheels travels on the other surface; and (2) a curved trajectory constant path radius course with uniform pavement for both wheel lanes.

1.3 As with all traction testing where vehicle uncontrollability is a likely outcome, sufficient precautions shall be taken to protect the driver, the vehicle, and the test site facilities from damage due to vehicle traction breakaway during testing. Standard precautions are roll-bars, secure mounting of all internal instrumentation, driver helment, and secure seat belt harness, etc.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Keywords

anti-lock braking system; plowing; spinout; split-μ testing; stopping distance; tire wet traction; vehicle uncontrollability

ICS Code

ICS Number Code 43.040.40 (Braking systems)

DOI: 10.1520/F1649-96R03

PDF Catalog

PDF Pages	PDF Title
1	Scope
2	Referenced Documents Terminology
3	Summary of Test Methods Significance and Use Test Vehicle
4	Test Instrumentation Requirements Preparation of Test Pavement(s)
5	Selection and Preparation of Test Tires
6	Vehicle Preparation Test Procedure
7	Calculation for Wet Traction Performance
8	Report Precision and Bias Keywords A1. INTERPRETATION OF RESULTS AND TIRE DESIGN FEATURE EVALUATION A1.1 Interpretation of Traction Performance Results TABLE A1.1
9	A1.2 Tire Design Feature Evaluation A1.3 Tire Design Features A2. TECHNIQUES FOR WATER APPLICATION AND CONTROL A2.1 Water Depth A2.2 Above-Surface Sprinklers
10	A2.3 Trickle Sprinklers A2.4 Other Watering Methods A3. SELECTING PATH RADIUS AND TEST SPEEDS FOR METHOD B TESTING A3.1 Introduction A3.2 Establishing the Degree of Criticality A3.3 Typical Required Cornering Traction A3.4 TABLE A3.1
11	A4. MEASURING ORTHOGONAL TRAJECTORY DEVIATION (PROCEDURE 1) A4.1 A4.2 Vehicle Reference Point and Vehicle Measuring Brack-ets A4.3 Trajectory Deviation Measurement—Method A A4.4 Trajectory Deviation Measurement—Method B FIG. A4.1 FIG. A4.2
12	X1. LIST OF INSTRUMENT SUPPLIERS

Additional information

Standard Title	F1649-96(2003) Standard Test Methods for Evaluating Wet Braking Traction Performance of Passenger Car Tires on Vehicles Equipped with Anti-Lock Braking Systems
Published Code	ASTM
Publication Date	2003
Pages Count	12
ICS Codes	43.040.40 - Braking systems