ASTM D6479-02(2007)
(Test Method)Standard Test Method for Determining the Edgecomb Resistance of Woven Fabrics Used in Inflatable Restraints
Standard Test Method for Determining the Edgecomb Resistance of Woven Fabrics Used in Inflatable Restraints
SIGNIFICANCE AND USE
A measurement of a fabric’edgecomb resistance indicates the relative tendency of a fabric to pull apart under seam stress or similar action. The related concepts of yarn slippage and seam slippage are limited to sewn seams, whereas the measurement of edgecomb resistance is made at the edge of a cut part in the absence of a sewn seam. The absence of a sewn seam in this test method eliminates the effect that a particular stitch might have on the tendency of a yarn to slip near an edge of a cut part
This test method is useful for material design evaluations in such applications as airbags in which seam stress is a major concern.
This method may be used as a complement to Test Method D 5822.
SCOPE
1.1 This test method covers the procedures for determining the resistance to edgecombing of a woven fabric used in inflatable restraints.
1.2 Procedures and apparatus other than those stated in this standard may be used by agreement of purchaser and supplier with the specific deviations from the standard practice acknowledged in the report.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore, each system must be used independent of the other.
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.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D 6479 – 02 (Reapproved 2007)
Standard Test Method for
Determining the Edgecomb Resistance of Woven Fabrics
Used in Inflatable Restraints
This standard is issued under the fixed designation D 6479; 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 E 691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
1.1 This test method covers the procedures for determining
the resistance to edgecombing of a woven fabric used in
3. Terminology
inflatable restraints.
3.1 Definitions:
1.2 Procedures and apparatus other than those stated in this
3.2 For definitions of other terms used in this standard, refer
standard may be used by agreement of purchaser and supplier
to Terminology D 123 and Terminology D 6799.
with the specific deviations from the standard practice ac-
knowledged in the report.
4. Summary of Test Method
1.3 The values stated in either SI units or inch-pound units
4.1 One end of a test specimen is clamped within one jaw of
are to be regarded separately as standard. The values stated in
a CRE tensile testing machine and a special fixture pierces a
each system are not exact equivalents; therefore, each system
row of equally spaced needle holes through the opposite end of
must be used independent of the other.
the specimen. In accordance with Test Method D 5035,a
1.4 This standard does not purport to address all of the
tensile force is applied to the specimen until rupture occurs.
safety concerns, if any, associated with its use. It is the
The measurement of the force required to cause rupture is the
responsibility of the user of this standard to establish appro-
measurement of edgecomb resistance.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Significance and Use
5.1 A measurement of a fabric’s edgecomb resistance indi-
2. Referenced Documents
2 cates the relative tendency of a fabric to pull apart under seam
2.1 ASTM Standards:
stress or similar action. The related concepts of yarn slippage
D 1776 Practice for Conditioning and Testing Textiles
and seam slippage are limited to sewn seams, whereas the
D 123 Terminology Relating to Textiles
measurement of edgecomb resistance is made at the edge of a
D 2904 Practice for Interlaboratory Testing of a Textile Test
cut part in the absence of a sewn seam. The absence of a sewn
Method that Produces Normally Distributed Data
seam in this test method eliminates the effect that a particular
D 2906 Practice for Statements on Precision and Bias for
stitch might have on the tendency of a yarn to slip near an edge
Textiles
of a cut part
D 5035 Test Method for Breaking Force and Elongation of
5.2 This test method is useful for material design evalua-
Textile Fabrics (Strip Method)
tions in such applications as airbags in which seam stress is a
D 5822 Test Method for Determining Seam Strength in
major concern.
Inflatable Restraint Cushions
5.3 This method may be used as a complement to Test
D 6799 Terminology Relating to Inflatable Restraints
Method D 5822.
6. Apparatus
This test method is under the jurisdiction ofASTM Committee D13 onTextiles
6.1 Tensile Testing Machine—A constant-rate-of-extension
and are the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.
(CRE) type, that is designed for the tensile forces anticipated,
Current edition approved July 1, 2007. Published August 2007. Originally
approved in 1999. Last previous edition approved in 2002 as D 6479 – 02.
thatisoperatedatarateof200 610mm/min(860.5in./min),
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
that has a force range selected such that the anticipated break
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
occurs between 10 and 90 % of full scale load, and that has
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. jaws and grip faces as agreed upon by purchaser and supplier.
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D 6479 – 02 (2007)
6.2 Clamps, jaws with smooth, flat, parallel faces a mini- 7.4 From the laboratory sample, select five test specimens
mum of 60 mm wide by 25 mm tall. The jaws may be padded each from the warp and fill directions (Fig. 2).
or coated under the jaw face area. 7.5 Without sealing or unraveling the edges, cut each
6.3 Fixture, compatible with tensile tester, equipped with specimen 50 6 1 mm wide and 300 6 5 mm long, with the
twelve equally spaced 1 mm diameter pins, 8 mm in length and long dimension parallel to the warp yarns for a warp-oriented
corresponding1.5mmdiameterholeswithastoplocated5mm test, and parallel to the fill
...
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