ASTM D5822-08
(Test Method)Standard Test Method for Determining Seam Strength in Inflatable Restraint Cushions
Standard Test Method for Determining Seam Strength in Inflatable Restraint Cushions
SIGNIFICANCE AND USE
Seam strength testing is used for design validation and for lot acceptance.
This test method constitutes the conditions, procedures, and equipment by which inflatable restraints are tested for seam strength and seam efficiency. It is intended to be used as a guideline in establishing a written part specification or print. The specification or agreement of purchaser and supplier may deviate from the procedures described herein when (based on experience) considerations of equipment, cushion design, or other factors dictate otherwise.
In cases of dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the purchaser and the supplier should perform comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens from the same lot of fabric to be evaluated, which utilize a like seam assembly (or standard seam assembly) to achieve seam interaction. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. If a bias is found, either its cause must be determined and corrected, or the purchaser and supplier must agree to interpret future test results in light of the known bias.
Test Method D 5822 is a reliable test method but procedures which may require special attention are identified in the precision and bias section of this test method.
SCOPE
1.1 This test method covers the measurement of seam efficiency and the maximum seam strength in inflatable restraint cushions composed of woven fabrics when a force is applied perpendicular to the seam, using a grab test. For evaluating sewing thread, refer to Test Method D 204.
1.2 This test method is restricted to seams that are obtained from an inflatable restraint cushion. Seams may include but are not limited to sewn, OPW, glued, fused (chemically or thermally).
1.3 This test method is used when the measurement of a resistance to a specified force, a breaking force, a minimum elongation, or a combination thereof are required to determine the seam strength, or seam integrity of a particular fabric for inflatable restraint use.
1.4 Procedures and apparatus other than those stated in this standard may be used by agreement between purchaser and supplier with the specific deviations from the standard acknowledged in the report.
1.5 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 independently of the other.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:D5822 −08
StandardTest Method for
Determining Seam Strength in Inflatable Restraint
1
Cushions
This standard is issued under the fixed designation D5822; 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 D204 Test Methods for Sewing Threads
D1776 Practice for Conditioning and Testing Textiles
1.1 This test method covers the measurement of seam
D6799 Terminology Relating to Inflatable Restraints
efficiency and the maximum seam strength in inflatable re-
straint cushions composed of woven fabrics when a force is
3. Terminology
applied perpendicular to the seam, using a grab test. For
evaluating sewing thread, refer to Test Method D204. 3.1 For all terminology relating to D13.20, Inflatable
restraints, refer to Terminology D6799.
1.2 This test method is restricted to seams that are obtained
3.1.1 The following terms are relevant to this standard:
from an inflatable restraint cushion. Seams may include but are
seam efficiency, seam failure, seam strength.
not limited to sewn, OPW, glued, fused (chemically or ther-
mally). 3.2 For all other terms related to textiles, see Terminology
D123.
1.3 This test method is used when the measurement of a
resistance to a specified force, a breaking force, a minimum
4. Summary of Test Method
elongation, or a combination thereof are required to determine
4.1 Specimens with and without seam assemblies taken
the seam strength, or seam integrity of a particular fabric for
from inflatable restraint cushions are destructively tested in a
inflatable restraint use.
tensile testing machine under laboratory conditions to deter-
1.4 Procedures and apparatus other than those stated in this
mine seam strength and seam efficiency.
standard may be used by agreement between purchaser and
supplier with the specific deviations from the standard ac-
5. Significance and Use
knowledged in the report.
5.1 Seam strength testing is used for design validation and
1.5 The values stated in either SI units or inch-pound units
for lot acceptance.
are to be regarded separately as standard. The values stated in
5.2 This test method constitutes the conditions, procedures,
each system are not exact equivalents; therefore, each system
and equipment by which inflatable restraints are tested for
must be used independently of the other.
seam strength and seam efficiency. It is intended to be used as
1.6 This standard does not purport to address all of the
a guideline in establishing a written part specification or print.
safety concerns, if any, associated with its use. It is the
The specification or agreement of purchaser and supplier may
responsibility of the user of this standard to establish appro-
deviate from the procedures described herein when (based on
priate safety and health practices and determine the applica-
experience) considerations of equipment, cushion design, or
bility of regulatory limitations prior to use.
other factors dictate otherwise.
2. Referenced Documents
5.3 In cases of dispute arising from differences in reported
2
test results when using this test method for acceptance testing
2.1 ASTM Standards:
of commercial shipments, the purchaser and the supplier
D123 Terminology Relating to Textiles
should perform comparative tests to determine if there is a
statistical bias between their laboratories. Competent statistical
1
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
assistance is recommended for the investigation of bias. As a
and is the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.
minimum, the two parties should take a group of test speci-
Current edition approved July 1, 2008. Published July 2008. Originally approved
mens from the same lot of fabric to be evaluated, which utilize
in 1995. Last previous edition approved in 2007 as D5822 – 03(2007). DOI:
10.1520/D5822-08.
a like seam assembly (or standard seam assembly) to achieve
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
seam interaction. The test specimens should then be randomly
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
assigned in equal numbers to each laboratory for testing. If a
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. bias is found, either its cause must be determined and
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D5822−08
corrected, or the purchaser and supplier must agree to interpret If seam efficiency testing
...
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:D5822–03 (Reapproved 2007) Designation: D 5822 – 08
Standard Test Method for
Determining Seam Strength in Inflatable Restraint
1
Cushions
This standard is issued under the fixed designation D 5822; 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 measurement of seam efficiency and the maximum seam strength in inflatable restraint cushions
composedofwovenfabricswhenaforceisappliedperpendiculartotheseam,usingagrabtest.Forevaluatingsewingthread,refer
to Test Method D 204.
1.2 This test method is restricted to seams that are obtained from an inflatable restraint cushion. Seams may include but are not
limited to sewn, OPW, glued, fused (chemically or thermally).
1.3 This test method is used when the measurement of a resistance to a specified force, a breaking force, a minimum elongation,
or a combination thereof are required to determine the seam strength, or seam integrity of a particular fabric for inflatable restraint
use.
1.4 Procedures and apparatus other than those stated in this standard may be used by agreement between purchaser and supplier
with the specific deviations from the standard acknowledged in the report.
1.5 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 independently of the other.
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
D 123 Terminology Relating to Textiles
D 204 Test Methods for Sewing Threads
D 1776 Practice for Conditioning and Testing Textiles
D3990Terminology Relating to Fabric Defects 6799 Terminology Relating to Inflatable Restraints
3. Terminology
3.1Definitions:
3.1.1seam effıciency, n— in inflatable restraints, the ratio of seam strength to fabric strength.
3.1.2seam failure, n— in inflatable restraints, the point at which an external force ruptures a seam assembly or the fabric, or
causes excessive yarn slippage adjacent to the seam assembly.
3.1.3seam strength, n— in inflatable restraints, the maximum force required to create a seam failure.
3.2For definitions of textile terms relating to inflatable restraints used in this standard, refer to Terminology D3990.
3.3For definitions of other textile terms used in this standard, refer to Terminology D123.
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: seam efficiency, seam failure, seam strength.
3.2 For all other terms related to textiles, see Terminology D 123.
4. Summary of Test Method
4.1 Specimens with and without seam assemblies taken from inflatable restraint cushions are destructively tested in a tensile
testing machine under laboratory conditions to determine seam strength and seam efficiency.
1
This test method is under the jurisdiction of ASTM Committee D13 on Textiles and is 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 1995. Last previous edition approved in 20032007 as
D 5822 – 03(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 ----------------------
D5822–08
5. Significance and Use
5.1 Seam strength testing is used for design validation and for lot acceptance.
5.2 This test method constitutes the conditions, procedures, and equipment by which inflatable restraints are tested for seam
strength and seam efficiency. It is intended to be used as a guideline in establishing a written part specification or print. The
specificationoragreementofpurchaserandsuppliermaydeviatefromtheproceduresdescribedhe
...
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