ASTM D6479-08
(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's 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.
1.4 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.
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Designation: D6479 – 08
Standard Test Method for
Determining the Edgecomb Resistance of Woven Fabrics
1
Used in Inflatable Restraints
This standard is issued under the fixed designation D6479; 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. Terminology
1.1 This test method covers the procedures for determining 3.1 For all terminology relating to D13.20, Inflatable re-
the resistance to edgecombing of a woven fabric used in straints, refer to Terminology D6799.
inflatable restraints. 3.1.1 The following terms are relevant to this standard:
1.2 Procedures and apparatus other than those stated in this edgecombing, inflatable restraint, seam slippage, yarn slippage
standard may be used by agreement of purchaser and supplier 3.2 For all other terms related to textiles, see Terminology
with the specific deviations from the standard practice ac- D123.
knowledged in the report. 3.3 Definitions:
1.3 The values stated in either SI units or inch-pound units 3.4 For definitions of other terms used in this standard, refer
are to be regarded separately as standard. The values stated in to Terminology D123 and Terminology D6799.
each system are not exact equivalents; therefore, each system
4. Summary of Test Method
must be used independent of the other.
1.4 This standard does not purport to address all of the 4.1 One end of a test specimen is clamped within one jaw of
a CRE tensile testing machine and a special fixture pierces a
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- row of equally spaced needle holes through the opposite end of
thespecimen.InaccordancewithTestMethodD5035,atensile
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. force is applied to the specimen until rupture occurs. The
measurement of the force required to cause rupture is the
2. Referenced Documents
measurement of edgecomb resistance.
2
2.1 ASTM Standards:
5. Significance and Use
D1776 Practice for Conditioning and Testing Textiles
D123 Terminology Relating to Textiles 5.1 A measurement of a fabric’s edgecomb resistance indi-
cates the relative tendency of a fabric to pull apart under seam
D2904 Practice for Interlaboratory Testing of a Textile Test
Method that Produces Normally Distributed Data stress or similar action. The related concepts of yarn slippage
and seam slippage are limited to sewn seams, whereas the
D2906 Practice for Statements on Precision and Bias for
3
Textiles 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
D5035 Test Method for Breaking Force and Elongation of
Textile Fabrics (Strip Method) 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
D5822 Test Method for Determining Seam Strength in
of a cut part
Inflatable Restraint Cushions
D6799 Terminology Relating to Inflatable Restraints 5.2 This test method is useful for material design evalua-
tions in such applications as airbags in which seam stress is a
E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method major concern.
5.3 This method may be used as a complement to Test
Method D5822.
1
This test method is under the jurisdiction ofASTM Committee D13 onTextiles
and are the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.
6. Apparatus
Current edition approved July 1, 2008. Published July 2008. Originally approved
in 1999. Last previous edition approved in 2007 as D6479 – 02(2007). DOI:
6.1 Tensile Testing Machine—A constant-rate-of-extension
10.1520/D6479-08.
(CRE) type, that is designed for the tensile forces anticipated,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
thatisoperatedatarateof200 610mm/min(860.5in./min),
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
that has a force range selected such that the anticipated break
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3
Withdrawn. The last approved version of this historical standard is referenced
on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D6479 – 08
occurs between 10 and 90 % of full scale load, and that has 7.3 From the end of each roll of fabric taken from the lot
jaws and grip faces as agreed upon by purc
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D6479–02 (Reapproved 2007) Designation: D 6479 – 08
Standard Test Method for
Determining the Edgecomb Resistance of Woven Fabrics
1
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 (´) indicates an editorial change since the last revision or reapproval.
1. 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.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D 1776 Practice for Conditioning and Testing Textiles
D 123 Terminology Relating to Textiles
D 2904 Practice for Interlaboratory Testing of a Textile Test Method that Produces Normally Distributed Data
D 2906 Practice for Statements on Precision and Bias for Textiles
D 5035 Test Method for Breaking Force and Elongation of Textile Fabrics (Strip Method)
D 5822 Test Method for Determining Seam Strength in Inflatable Restraint Cushions
D 6799 Terminology Relating to Inflatable Restraints
E 691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1Definitions:
3.2For definitions of other terms used in this standard, refer to Terminology D123 and Terminology D6799
3.1 For all terminology relating to D13.20, Inflatable restraints, refer to Terminology D 6799.
3.1.1 The following terms are relevant to this standard: edgecombing, inflatable restraint, seam slippage, yarn slippage
3.2 For all other terms related to textiles, see Terminology D 123.
3.3 Definitions:
3.4 For definitions of other terms used in this standard, refer to Terminology D 123 and Terminology D 6799.
4. Summary of Test Method
4.1 One end of a test specimen is clamped within one jaw of a CRE tensile testing machine and a special fixture pierces a row
of equally spaced needle holes through the opposite end of the specimen. In accordance with Test Method D 5035, a tensile force
is applied to the specimen until rupture occurs. The measurement of the force required to cause rupture is the measurement of
edgecomb resistance.
5. Significance and Use
5.1 Ameasurement of a fabric’s edgecomb resistance indicates the relative tendency of a fabric to pull apart under seam stress
1
This test method is under the jurisdiction of ASTM Committee D13 on Textiles and are the direct responsibility of Subcommittee D13.20 on Inflatable Restraints .
Current edition approved July 1, 2007.2008. Published August 2007.July 2008. Originally approved in 1999. Last previous edition approved in 20022007 as
D 6479 – 02(2007).
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D6479–08
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
5.2 This test method is useful for material design evaluations in such applications as airbags in which seam stress is a major
concern.
5.3 This method may be used as a complement to Test Method D 5822.
6. Apparatus
6.1 Tensile Testing Machine—A constant-rate-of-extens
...
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