ASTM D6588-02
(Test Method)Standard Test Method for Fatigue of Tire Cords (Disc Fatigue Test)
Standard Test Method for Fatigue of Tire Cords (Disc Fatigue Test)
SIGNIFICANCE AND USE
This test method is not recommended for acceptance testing of commercial shipments in the absence of reliable information on between-laboratory precision.
5.1.1 If there are differences of practical significance between the reported test results for two laboratories (or more), a comparative test should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, test samples should be used that are as homogeneous as possible, that are drawn from a material from which the disparate test results were obtained, and that are randomly assigned in equal numbers to each laboratory for testing. Other fabrics with established test values may be used for this purpose. The test results from the two laboratories should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. If a bias is found, either its cause must be found and corrected, or future test results must be adjusted in consideration of the known bias.
SCOPE
1.1 This test method covers the determination of fatigue of tire cords in rubber due to compression or extension, or both, using a disc fatigue tester. The fatigue is measured as a loss in strength.
1.2 The values stated in either SI units or other units (in parentheses) are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other.
1.3 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 to determine the applicability of regulatory limitations prior to use.
General Information
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Standards Content (Sample)
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Designation:D6588–02
Standard Test Method for
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Fatigue of Tire Cords (Disc Fatigue Test)
This standard is issued under the fixed designation D6588; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope accomplished by subjecting the tire cords, after being cured in
rubber, to repeated cycles of compression and extension.
1.1 This test method covers the determination of fatigue of
4.2 The specimen of interest is the cord after it has been
tire cords in rubber due to compression or extension, or both,
stressed and later removed from the rubber in which it was
using a disc fatigue tester. The fatigue is measured as a loss in
imbedded. Cord specimens are placed between strips of rubber
strength.
compound and molded into blocks.The specimen block is then
1.2 The values stated in either SI units or other units (in
mounted between two rotating discs that are positioned in such
parentheses) are to be regarded separately as standard. The
a way that the specimen will undergo compression or exten-
values stated in each system are not exact equivalents; there-
sion, or both, as the discs rotate. After a specified number of
fore, each system shall be used independently of the other.
cycles, the cords are removed from the blocks and their
1.3 This standard does not purport to address all of the
breaking force measured on a tensile testing machine. The
safety concerns, if any, associated with its use. It is the
fatigue, based on the unfatigued specimen strength, is ex-
responsibility of the user of this standard to establish appro-
pressed as a percent strength loss in fatigued specimens.
priatesafetyandhealthpracticestodeterminetheapplicability
of regulatory limitations prior to use.
5. Significance and Use
2. Referenced Documents 5.1 This test method is not recommended for acceptance
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testing of commercial shipments in the absence of reliable
2.1 ASTM Standards:
information on between-laboratory precision.
D76 Specification for Tensile Testing Machines for Textiles
5.1.1 If there are differences of practical significance be-
D123 Terminology Relating to Textiles
tween the reported test results for two laboratories (or more), a
D885 Test Methods for Tire Cords, Tire Cord Fabrics, and
comparative test should be performed to determine if there is a
Industrial Filament Yarns Made from Manufactured
statistical bias between them, using competent statistical assis-
Organic-Base Fibers
tance. As a minimum, test samples should be used that are as
D1776 Practice for Conditioning and Testing Textiles
homogeneous as possible, that are drawn from a material from
D6477 Terminology Relating to Tire Cord, Bead Wire,
which the disparate test results were obtained, and that are
Hose Reinforcing Wire, and Fabrics
randomly assigned in equal numbers to each laboratory for
3. Terminology
testing. Other fabrics with established test values may be used
for this purpose. The test results from the two laboratories
3.1 Definitions:
should be compared using a statistical test for unpaired data, at
3.1.1 For definitions of terms relating to tire cord and
a probability level chosen prior to the testing series. If a bias is
fabrics, see Terminology D6477.
found, either its cause must be found and corrected, or future
3.1.2 For definitions of other terms related to textiles, see
test results must be adjusted in consideration of the known
Terminology D123.
bias.
4. Summary of Test Method
6. Apparatus, Materials, and Reagents
4.1 disc fatigue is a measure of the strength loss of a tire
6.1 Disc Fatigue Tester (see schematic drawing in Fig. 1),
cord, which is subjected to repeated stresses. The stresses are
with capacity for 12 specimens. For actual dimensions, see
patent US 2595069. Testers with different capacity are accept-
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This test method is under the jurisdiction ofASTM Committee D13 onTextiles
able.
and is the direct responsibility of Subcommittee D13.19 on Tire Cord and Fabrics
6.2 Transducer, with digital readout or dial gage for setting
Current edition approved April 10, 2002. Published June 2002. Originally
published as D6588–00. Last previous edition D6588–00. DOI: 10.1520/D6588-02. distance between disc fatigue flanges to the nearest 0.01 mm
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
(0.004 in.).
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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