ASTM D6588/D6588M-11(2016)
(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
5.1 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 inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.
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)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D6588/D6588M − 11 (Reapproved 2016)
Standard Test Method for
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Fatigue of Tire Cords (Disc Fatigue Test)
This standard is issued under the fixed designation D6588/D6588M; 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 3.1.1 For definitions of terms relating to tire cord and
fabrics, see Terminology D6477.
1.1 This test method covers the determination of fatigue of
3.1.2 For definitions of other terms related to textiles, see
tire cords in rubber due to compression or extension, or both,
Terminology D123.
using a disc fatigue tester. The fatigue is measured as a loss in
strength.
4. Summary of Test Method
1.2 The values stated in either SI units or inch-pound units
4.1 disc fatigue is a measure of the strength loss of a tire
are to be regarded separately as standard. The values stated in
cord, which is subjected to repeated stresses. The stresses are
each system may not be exact equivalents; therefore, each
accomplished by subjecting the tire cords, after being cured in
system shall be used independently of the other. Combining
rubber, to repeated cycles of compression and extension.
values from the two systems may result in nonconformance
4.2 The specimen of interest is the cord after it has been
with the standard.
stressed and later removed from the rubber in which it was
1.3 This standard does not purport to address all of the
imbedded. Cord specimens are placed between strips of rubber
safety concerns, if any, associated with its use. It is the
compound and molded into blocks.The specimen block is then
responsibility of the user of this standard to establish appro-
mounted between two rotating discs that are positioned in such
priatesafetyandhealthpracticestodeterminetheapplicability
a way that the specimen will undergo compression or
of regulatory limitations prior to use.
extension, or both, as the discs rotate.After a specified number
of cycles, the cords are removed from the blocks and their
2. Referenced Documents
breaking force measured on a tensile testing machine. The
2
2.1 ASTM Standards:
fatigue, based on the unfatigued specimen strength, is ex-
D76 Specification for Tensile Testing Machines for Textiles
pressed as a percent strength loss in fatigued specimens.
D123 Terminology Relating to Textiles
D885 Test Methods for Tire Cords, Tire Cord Fabrics, and
5. Significance and Use
Industrial Filament Yarns Made from Manufactured
5.1 This test method is not recommended for acceptance
Organic-Base Fibers
testing of commercial shipments in the absence of reliable
D1776 Practice for Conditioning and Testing Textiles
information on between-laboratory precision.
D6477 Terminology Relating to Tire Cord, Bead Wire, Hose
5.1.1 If there are differences of practical significance be-
Reinforcing Wire, and Fabrics
tween the reported test results for two laboratories (or more), a
D7269 Test Methods for Tensile Testing of Aramid Yarns
comparative test should be performed to determine if there is a
statistical bias between them, using competent statistical assis-
3. Terminology
tance. As a minimum, test samples should be used that are as
3.1 Definitions:
homogeneous as possible, that are drawn from a material from
which the disparate test results were obtained, and that are
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This test method is under the jurisdiction ofASTM Committee D13 on Textiles
randomly assigned in equal numbers to each laboratory for
and is the direct responsibility of Subcommittee D13.19 on Industrial Fibers and
testing. Other fabrics with established test values may be used
Metallic Reinforcements
for this purpose. The test results from the two laboratories
Current edition approved July 1, 2016. Published August 2016. Originally
should be compared using a statistical test for unpaired data, at
approved in 2000. Last previous edition approved in 2011 as D6588–11. DOI:
10.1520/D6588_D6588M-11R16.
a probability level chosen prior to the testing series. If a bias is
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
found, either its cause must be found and corrected, or future
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
test results must be adjusted in consideration of the known
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. bias.
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