ASTM D5587-15(2019)
(Test Method)Standard Test Method for Tearing Strength of Fabrics by Trapezoid Procedure
Standard Test Method for Tearing Strength of Fabrics by Trapezoid Procedure
SIGNIFICANCE AND USE
5.1 This test method is considered satisfactory for acceptance testing of commercial shipments because current estimates of between-laboratory precision are acceptable, and this test method is used extensively in the trade for acceptance testing.
5.2 If there are differences of practical significance between test results for two laboratories (or more), comparative test should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, use the samples for such a comparative test that are as homogeneous as possible, drawn from the same lot of material as the samples that resulted in disparate results during initial testing. Randomly assign the samples in equal numbers to each laboratory. The test results from the laboratories involved should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. If bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias.
5.3 The trapezoid tear produces tension along a reasonably defined course such that the tear propagates across the width of the specimen. It is useful for estimating the relative tear resistance of different fabrics or different directions in the same fabric.
5.4 Depending on the nature of the specimen, the data recording devices will show the tearing force in the form of a peak or peaks. The highest peaks appear to reflect the strength of the yarn components, individually or in combination, needed to stop a tear in fabrics of the same construction. The valleys recorded between the peaks have no specific significance. The minimum tearing force, however, is indicated to be above the lowest valleys.
5.5 Most textile fabrics can be tested by this test method. Some modification of clamping techniques may be necessary for a given fabric, depending upon its structure. Strong fabrics or fabrics...
SCOPE
1.1 This test method covers the measurement of the tearing strength of textile fabrics by the trapezoid procedure using a recording constant-rate-of-extension-type (CRE) tensile testing machine.
1.1.1 The CRE-type tensile testing machine has become the preferred test apparatus for determining trapezoid tearing strength. It is recognized that some constant-rate-of-traverse-type (CRT) tensile testing machines continue to be used. Consequently, these test instruments may be used when agreed upon between the purchaser and the supplier. The conditions for use of the CRT-type tensile tester are included in Appendix X1.
1.2 This test method applies to most fabrics including woven fabrics, air bag fabrics, blankets, napped fabrics, knitted fabrics, layered fabrics, pile, and nonwoven fabrics. The fabrics may be untreated, heavily sized, coated, resin-treated, or otherwise treated. Instructions are provided for testing specimens with or without wetting.
1.3 Tearing strength, as measured in this test method, requires that the tear be initiated before testing. The reported value obtained is not directly related to the force required to initiate or start a tear.
1.4 Two calculations for trapezoid tearing strength are provided: the single-peak force and the average of five highest peak forces.
1.5 The values stated in SI units are to be regarded as the standard. The values stated in inch-pound units may be approximate.
1.6 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International ...
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: D5587 − 15 (Reapproved 2019)
Standard Test Method for
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Tearing Strength of Fabrics by Trapezoid Procedure
This standard is issued under the fixed designation D5587; 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 ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.1 This test method covers the measurement of the tearing
mendations issued by the World Trade Organization Technical
strength of textile fabrics by the trapezoid procedure using a
Barriers to Trade (TBT) Committee.
recordingconstant-rate-of-extension-type(CRE)tensiletesting
machine.
2. Referenced Documents
1.1.1 The CRE-type tensile testing machine has become the
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2.1 ASTM Standards:
preferred test apparatus for determining trapezoid tearing
D76 Specification for Tensile Testing Machines for Textiles
strength. It is recognized that some constant-rate-of-traverse-
D123 Terminology Relating to Textiles
type (CRT) tensile testing machines continue to be used.
D629 Test Methods for Quantitative Analysis of Textiles
Consequently, these test instruments may be used when agreed
D1776 Practice for Conditioning and Testing Textiles
upon between the purchaser and the supplier. The conditions
D2904 Practice for Interlaboratory Testing of a Textile Test
for use of the CRT-type tensile tester are included in Appendix
Method that Produces Normally Distributed Data (With-
X1.
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drawn 2008)
1.2 This test method applies to most fabrics including
D2906 Practice for Statements on Precision and Bias for
wovenfabrics,airbagfabrics,blankets,nappedfabrics,knitted
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Textiles (Withdrawn 2008)
fabrics, layered fabrics, pile, and nonwoven fabrics. The
D4850 Terminology Relating to Fabrics and Fabric Test
fabrics may be untreated, heavily sized, coated, resin-treated,
Methods
or otherwise treated. Instructions are provided for testing
specimens with or without wetting.
3. Terminology
1.3 Tearing strength, as measured in this test method,
3.1 For all terminology relating to D13.59, Fabric Test
requires that the tear be initiated before testing. The reported
methods, General, refer to Terminology D4850.
value obtained is not directly related to the force required to
3.1.1 The following terms are relevant to this standard:
initiate or start a tear.
fabric, in textiles; peak force, in tear testing of fabrics; tearing
force, in fabric; tearing strength, in fabrics; yarn distortion (see
1.4 Two calculations for trapezoid tearing strength are
Fig. 1).
provided: the single-peak force and the average of five highest
peak forces.
3.2 For all other terms related to textiles, refer to Terminol-
ogy D123.
1.5 The values stated in SI units are to be regarded as the
standard. The values stated in inch-pound units may be
4. Summary of Test Method
approximate.
4.1 An outline of an isosceles trapezoid is marked on a
1.6 This standard does not purport to address all of the
rectangular specimen (see Fig. 2). The specimen is slit at the
safety concerns, if any, associated with its use. It is the
center of the smallest base of the trapezoid to start the tear.The
responsibility of the user of this standard to establish appro-
nonparallel sides of the marked trapezoid are clamped in
priate safety, health, and environmental practices and deter-
parallel clamps of a tensile testing machine. The separation of
mine the applicability of regulatory limitations prior to use.
the clamps is increased continuously to apply a force to
1.7 This international standard was developed in accor-
propagate the tear across the specimen. At the same time, the
dance with internationally recognized principles on standard-
1 2
This test method is under the jurisdiction ofASTM Committee D13 on Textiles For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and is the direct responsibility of Subcommittee D13.60 on Fabric Test Methods, contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Specific. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved July 1, 2019. Published July 2019. Originally approved the ASTM website.
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in 1996. Last previous edition approved in 2015 as D5587 – 15. DOI: 10.1520/ The last approved version of this historical standard is referenced on
D5587-15R19. www.astm.org.
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