ASTM D5807-02a(2007)
(Practice)Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions
Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions
SIGNIFICANCE AND USE
This practice is intended to be a general guideline for repetitive testing, safe conduct of tests, and accurate data collection for inflatable restraints. Cushion overpressurization testing may be used for design and production validation, for manufacturing process control, for lot acceptance, or for a combination thereof.
This practice constitutes the conditions, apparatus, and procedures by which inflatable restraints are commonly tested for cushion overpressurization. It is intended to be used as a guideline in establishing a cushion specification or equivalent document. The practices in the specification may deviate from the practices described herein when (based on experience) considerations of equipment, cushion design, or other factors dictate otherwise.
There exists a large variety in cushion configurations and equipment designs, obviating a standard test method for cushion overpressurization. Therefore, a cushion specification should incorporate the practices stated herein when describing a test method for testing a specific cushion geometry and apparatus design. To ensure accuracy and repeatability, the specification should also address precision and bias in a manner consistent with ASTM prescribed procedures and consistent with the particular cushion geometry, equipment in use, and test procedures.
5.3.1 Sources of variation in cushion overpressurization testing procedures include orifice size, attachment fixture, sensor location, method of attachment, presence or absence of internal bladder, accumulator size and pressure, transducer type and location, the presence or absence of tethers, presence or absence of vent plugs, and the accuracy of timing devices and pressure sensors. All sources of equipment and procedural variation should be addressed in the applicable specification.
In accordance with the applicable specification, cushions may be pressurized without bursting to determine their resistance to a fixed level of high internal pressure, or ...
SCOPE
p>1.1 This practice covers the procedures and conditions used to evaluate the physical performance of inflatable restraint cushions during and after overpressurization testing at elevated pressures capable of causing cushion bursting using air pressurization equipment.
1.2 The physical performance characteristics that may be obtained in conjunction with this practice are internal cushion pressures determined by instrumentation and material integrity, determined by visual inspection.
1.3 This practice is applicable to all inflatable restraint cushions.
1.4 Procedures and apparatus other than those stated in this practice may be used by agreement between purchaser and supplier with the specific deviations from this practice 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.
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. See Section 8 for specific hazard information.
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Standards Content (Sample)
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Designation: D 5807 – 02a (Reapproved 2007)
Standard Practice for
Evaluating the Overpressurization Characteristics of
Inflatable Restraint Cushions
This standard is issued under the fixed designation D 5807; 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 3.2 For definitions of other terms used in this standard, refer
to Terminology D 123 and Terminology D 6799.
1.1 This practice covers the procedures and conditions used
to evaluate the physical performance of inflatable restraint
4. Summary of Practice
cushions during and after overpressurization testing at elevated
4.1 Inflatable restraint cushions are tested under laboratory
pressures capable of causing cushion bursting using air pres-
conditions to evaluate cushion integrity when exposed to
surization equipment.
internal cushion pressures greater than deployment pressures.
1.2 The physical performance characteristics that may be
If cushion rupture occurs, the rupture pressure, time to rupture,
obtained in conjunction with this practice are internal cushion
and mode of rupture are recorded.
pressures determined by instrumentation and material integrity,
4.2 Inflatable restraint cushions are mounted into a test
determined by visual inspection.
stand that allows for inflations under conditions that exceed
1.3 This practice is applicable to all inflatable restraint
deployment pressures. Instrumentation within the test stand
cushions.
charts inflation pressures versus time and may allow for
1.4 Procedures and apparatus other than those stated in this
photographic review of the overpressurization sequence.
practice may be used by agreement between purchaser and
4.3 Cushion overpressurization results are reviewed for
supplier with the specific deviations from this practice ac-
pressure and time relationships, and post-inflation material
knowledged in the report.
analysis.
1.5 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
5. Significance and Use
each system are not exact equivalents; therefore, each system
5.1 This practice is intended to be a general guideline for
must be used independently of the other.
repetitive testing, safe conduct of tests, and accurate data
1.6 This standard does not purport to address all of the
collection for inflatable restraints. Cushion overpressurization
safety concerns, if any, associated with its use. It is the
testing may be used for design and production validation, for
responsibility of the user of this standard to establish appro-
manufacturing process control, for lot acceptance, or for a
priate safety and health practices and determine the applica-
combination thereof.
bility of regulatory limitations prior to use. See Section 8 for
5.2 This practice constitutes the conditions, apparatus, and
specific hazard information.
procedures by which inflatable restraints are commonly tested
2. Referenced Documents for cushion overpressurization. It is intended to be used as a
2 guideline in establishing a cushion specification or equivalent
2.1 ASTM Standards:
document. The practices in the specification may deviate from
D 123 Terminology Relating to Textiles
the practices described herein when (based on experience)
D 6799 Terminology Relating to Inflatable Restraints
considerations of equipment, cushion design, or other factors
3. Terminology dictate otherwise.
5.3 There exists a large variety in cushion configurations
3.1 Definitions:
and equipment designs, obviating a standard test method for
cushion overpressurization. Therefore, a cushion specification
ThispracticeisunderthejurisdictionofASTMCommitteeD13onTextilesand
should incorporate the practices stated herein when describing
is the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.
a test method for testing a specific cushion geometry and
Current edition approved July 1, 2007. Published August 2007. Originally
apparatus design. To ensure accuracy and repeatability, the
approved in 1995. Last previous edition approved in 2002 as D 5807 – 02a.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
specification should also address precision and bias in a
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
manner consistent with ASTM prescribed procedures and
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.
D 5807 – 02a (2007)
consistent with the particular cushion geometry, equipment in 6.9 Lighting System, suitable for high resolution photogra-
use, and test procedures. phy (optional).
5.3.1 Sources of variation in cushion overpressurization
7. Interferences
testing procedures include orifice size, attachment fixture,
7.1 The pressure transducer and/or pickup tube within the
sensor location, method of attachment, presence or absence of
mounting fixture must be mounted in a position that does not
internal bladder, accumulator size and pressure, transducer
interfere with the unfolding cushion.
type and location, the presence or absence of tethers, presence
7.2 The pressure versus time data is subject to recording
or absence of vent plugs, and the accuracy of timing devices
anomalies and electronic noise. The data should be digitally
and pressure sensors.All sources of equipment and procedural
filtered to obtain the underlying smooth pressure curve prior to
variation should be addressed in the applicable specification.
data analysis.
5.4 In accordance with the applicable specification, cush-
ions may be pressurized without bursting to determine their
8. Hazards
resistance to a fixed level of high internal pressure, or they may
8.1 Personnel conducting cushion overpressurization testing
be subjected to increasing pressures to determine their ultimate
in the same room as the testing unit must be equipped with the
bursting strength.
appropriate safety equipment and safety training. Examples of
the necessary safety equipment include, but are not limited to,
6. Apparatus
ear protection, equipment shielding, and safety glasses. Proper
6.1 Plastic Liner Bags,withacombinedburstingstrengthof
written safety procedures shall be provided to all test personnel
3.5 kPa (0.5 psi) or less for use as optional bladders to aid in
for compliance with standard industry practices. There shall be
the bursting of cushions whose fabric permeability is too high
compliance to all applicable Occupational Safety and Health
to permit ultimate bursting strength testing without them.
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