ASTM F551-89(2000)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F551–89 (Reapproved 2000)
Standard Practice for
Using a 67.23-in. (1.707-m) Diameter Laboratory Test
Roadwheel in Testing Tires
This standard is issued under the fixed designation F 551; the number immediately following the designation indicates the year of
original 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5.2 This test apparatus operating in the laboratory at con-
trolled surface speeds, loads, and ambient temperatures simu-
1.1 This practice covers the requirements for a 67.23-in.
lates, to a degree, tire-operating conditions resembling actual
(1.707-m) diameter laboratory roadwheel for durability and
service. Because of the roadwheel curvature, the test tire is
endurance testing of tires under controlled operating and
fatigued more rapidly than a tire operating on a road.
environmental conditions.
5.3 The laboratory roadwheel described in this practice is
1.2 The values stated in inch-pound units are to be regarded
suitable for comparative evaluation of tires under controlled
as the standard. The values given in parentheses are for
operating and environmental conditions.
information only.
5.4 While the laboratory roadwheel may not reproduce
1.3 This standard does not purport to address all of the
structural fatigue exactly as it occurs in service, the laboratory
safety concerns, if any, associated with its use. It is the
wheel can be used to produce fatigue under controlled condi-
responsibility of the user of this standard to establish appro-
tions.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. For specific
6. Apparatus
precautionary statements, see Section 7 and Note 1.
6.1 Laboratory Test Roadwheel—A laboratory test road-
2. Referenced Documents wheel consists of a large steel wheel against which one or more
tire-wheel assemblies are pressed at specific loads (see Fig. 1).
2.1 ASTM Standards:
6.1.1 Theroadwheelshallhaveanoutsidediameterof67.23
F 538 Terminology Relating to the Characteristics and Per-
in. (1.707 m) 6 0.5 %. This dimension originated from the
formance of Tires
choice of the circumference of the roadwheel as being ⁄300
3. Terminology
mile.
6.1.2 The width of the roadwheel shall be such that the
3.1 Definitions—Definitions given in Terminology F 538
edges are not in contact with the tire under test.
are regarded as standard.
6.1.3 The surface roughness of the roadwheel that is in
4. Summary of Practice
contactwiththetireshallnotbeinexcessof125µin.(3.18µm)
and must be continuous and without holes or projections.
4.1 This practice describes the specifications and dimen-
Where it is necessary to provide for the affixing of special test
sions of a 67.23-in. (1.707-m) diameter laboratory roadwheel
accessories such as cleats, the empty bolt holes in the path of
system for testing of one or more tire assemblies under
the tire contact width should be plugged, so as to match the
controlled conditions. It also describes the calibration proce-
wheel curvature and be within the maximum specified surface
dures for the standard operation of the wheel.
roughness.
5. Significance and Use
6.1.4 The total indicated radial runout of the wheel shall not
exceed 0.01 in. (0.25 mm).
5.1 The 67.23-in. (1.707-m) diameter laboratory test road-
6.2 Loading System:
wheel is one of the most extensively employed testing devices
6.2.1 The loading system shall be capable of applying and
for tire durability and endurance testing.
controlling the tire loading force to the desired level.
6.2.2 Thetireloadingforceshallpassthroughtheaxisofthe
This practice is under the jurisdiction ofASTM Committee F09 on Tires and is
tire under test and the axis of the roadwheel at all times.
the direct responsibility of Subcommittee F09.10 on Equipment, Facilities, and
Calibration.
6.2.3 The axis of rotation of the roadwheel and the axis of
Current edition approved Aug. 25, 1989. Published October 1989. Originally
rotation of the tire undergoing test shall be parallel within 10
published as F 551 – 77. Last previous edition F 551 – 84.
min of arc for camber and slip angle.
Annual Book of ASTM Standards, Vol 09.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F551
FIG. 1 Laboratory Tire Test Roadwheel
6.2.4 Each tire-loading system should be equipped with a 7. Safety Precautions
device that causes the tire to be retracted from the roadwheel
7.1 The tire, rim, and wheel must be free of obvious defects,
immediately upon its reaching a preset deflection indicative of
as judged by visual inspection. In particular, the bolt holes, the
tire failure or air loss.
valve, and the base of the rim flange must not be worn
6.3 Drive—The drive shall be capable of rotating the
excessively.
roadwheel and maintaining the desired surface speed under all
7.2 Hazards During the Test—Atireisapressurevesselthat
load conditions.
becomes progressively weaker during a wheel test, both
6.4 Ambient Temperature Conditions—Ambient tempera-
because of fatigue damage and by the lower tensile strength of
ture surrounding the tire(s) shall be controlled at 100° 6 5°F
the components at the high temperatures developed.Therefore,
(38 6 3°C) for all operating conditions.
a catastrophic loss of air pressure shall be anticipated at every
6.5 Instrumentation:
stage of the test. Such a failure may be accompanied by
6.5.1 Equipment shall be provided to indicate roadwheel
fragments having a high energy level being thrown from the
surface speed and to provide a measure of the linear equivalent
degenerated tire. Adequate machine safeguards and fire and
distance traveled.
personnel protection
...