Name: ASTM D5807-02a - Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions
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Abstract

Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions

SCOPE
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 driver-side inflatable restraint cushions only.
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.
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. See Section 8 for specific hazard information.

General Information

Status

Historical

Publication Date

09-Sep-2002

ICS

43.040.80 - Crash protection and restraint systems

Technical Committee

D13 - Textiles

Drafting Committee

D13.20 - Inflatable Restraints

Current Stage

Ref Project

Relations

Replaces

ASTM D5807-02 - Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions

Effective Date

10-Sep-2002

Replaced By

ASTM D5807-02a(2007) - Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions

Effective Date

01-Jan-2007

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ASTM D5807-02a - Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions

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ASTM D5807-02a - Standard Prac...

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D 5807 – 02a
Standard Practice for
Evaluating the Overpressurization Characteristics of
1
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 4. Summary of Practice
1.1 This practice covers the procedures and conditions used 4.1 Inﬂatable restraint cushions are tested under laboratory
to evaluate the physical performance of inﬂatable restraint conditions to evaluate cushion integrity when exposed to
cushions during and after overpressurization testing at elevated internal cushion pressures greater than deployment pressures.
pressures capable of causing cushion bursting using air pres- If cushion rupture occurs, the rupture pressure, time to rupture,
surization equipment. and mode of rupture are recorded.
1.2 The physical performance characteristics that may be 4.2 Inﬂatable restraint cushions are mounted into a test
obtained in conjunction with this practice are internal cushion stand that allows for inﬂations under conditions that exceed
pressures determined by instrumentation and material integrity, deployment pressures. Instrumentation within the test stand
determined by visual inspection. charts inﬂation pressures versus time and may allow for
1.3 This practice is applicable to all inﬂatable restraint photographic review of the overpressurization sequence.
cushions. 4.3 Cushion overpressurization results are reviewed for
1.4 Procedures and apparatus other than those stated in this pressure and time relationships, and post-inﬂation material
practice may be used by agreement between purchaser and analysis.
supplier with the speciﬁc deviations from this practice ac-
5. Signiﬁcance and Use
knowledged in the report.
5.1 This practice is intended to be a general guideline for
1.5 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in repetitive testing, safe conduct of tests, and accurate data
collection for inﬂatable restraints. Cushion overpressurization
each system are not exact equivalents; therefore, each system
testing may be used for design and production validation, for
must be used independently of the other.
1.6 This standard does not purport to address all of the manufacturing process control, for lot acceptance, or for a
combination thereof.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 5.2 This practice constitutes the conditions, apparatus, and
procedures by which inﬂatable restraints are commonly tested
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. See Section 8 for for cushion overpressurization. It is intended to be used as a
guideline in establishing a cushion speciﬁcation or equivalent
speciﬁc hazard information.
document. The practices in the speciﬁcation may deviate from
2. Referenced Documents
the practices described herein when (based on experience)
2.1 ASTM Standards: considerations of equipment, cushion design, or other factors
2
D 123 Terminology Relating to Textiles dictate otherwise.
3
D 6799 Terminology Relating to Inﬂatable Restraints 5.3 There exists a large variety in cushion conﬁgurations
and equipment designs, obviating a standard test method for
3. Terminology
cushion overpressurization. Therefore, a cushion speciﬁcation
3.1 Deﬁnitions: should incorporate the practices stated herein when describing
3.2 For deﬁnitions of other terms used in this standard, refer
a test method for testing a speciﬁc cushion geometry and
to Terminology D 123 and Terminology D 6799. apparatus design. To ensure accuracy and repeatability, the
speciﬁcation should also address precision and bias in a
manner consistent with ASTM prescribed procedures and
1
ThispracticeisunderthejurisdictionofASTMCommitteeD13onTextilesand
consistent with the particular cushion geometry, equipment in
is the direct responsibility of Subcommittee D13.20 on Inﬂatable Restraints.
use, and test procedures.
Current edition approved Sept. 10, 2002. Published November 2002. Last
previous edition D 5807 - 02.
2
Annual Book of ASTM Standards, Vol 07.01.
3
Annual Book of ASTM Standards, Vol 07.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D 5807 – 02a
5.3.1 Sources of variation in cushion overpressurization 7. Interferences
testing procedures include oriﬁce size, attachment ﬁxture,
...

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5.1 This test method may be used for product development and design, production validation, manufacturing process control, lot acceptance, or for a combination thereof.
5.2 The rate of inflation in this method does not attempt to mimic that of an actual cushion deployment, nor is it intended to subject the cushion to the dynamic loads, stress, and temperatures during such an event. It is also recognized that the compressed air used for this tests may not leak through the cushion at the same rate as the gas or mixture of gasses typically used in cushion inflators. Rather this method is intended to give a relative indication of the pressure holding ability of the cushion.
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5.4 Within the limits of variance expressed in Section 12, this test method is useful for design and production validation and may be suitable for incorporation in a cushion specification or for lot acceptance testing of commercial shipments.
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1.1 This test method is intended to determine the ability of an inflatable restraint cushion to retain air pressure at elevated pressures for a specified time interval.
1.2 Procedures and apparatus other than those stated in this test method may be used by agreement of purchaser and supplier, provided the specific deviations from the standard acknowledged in the report.
1.3 The results of this test method should not be used to predict the actual internal pressure decay of a cushion during a deployment.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
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Standard Practice for Evaluating the Performance of Inflatable Restraint Modules

SIGNIFICANCE AND USE
5.1 This practice is intended to be a general guideline for repetitive testing, safe conduct of tests, and accurate data collection for inflatable restraints.
5.2 This practice may be used by the purchaser and the supplier to establish the criteria by which inflatable restraint modules will be tested by the supplier to determine whether a lot of material is acceptable for shipment to the purchaser.
5.3 Unless otherwise specified by agreement between the purchaser and the supplier, this practice shall constitute the test conditions, procedures, and equipment by which inflatable restraint modules are deployed for testing. It is intended to be used as a guideline in establishing a written material specification or equivalent agreement between the purchaser and the supplier. The specification may deviate from the practices described herein when (based on experience) considerations of fabric properties, material handling equipment, or inflatable restraint system design dictate otherwise.
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1.1 This practice describes the procedures and conditions used to evaluate the physical performance of inflatable restraint modules and module components during and after deployment.
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1.3 This practice is applicable to driver and passenger side inflatable restraint modules.
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Standard Practice for Accelerated Aging of Inflatable Restraint Fabrics

SIGNIFICANCE AND USE
5.1 For inflatable restraints, practices for conducting accelerated aging are designed to determine the aggravated effects on a fabric from exposures to heat, humidity, or ozone, or a combination thereof. These environmental conditions may also be cycled in combination. The four accelerated aging procedures of concern to the design and manufacture of inflatable restraints are referred to as cycle aging, heat aging, humidity aging, and ozone aging.
5.2 The environmental conditions described in this practice are designed to allow restraints so that reliable comparisons may be made between different fabrics and different laboratories.
5.3 In order to achieve precise and reliable physical property comparisons of different fabrics, it is necessary to control accurately the humidity, temperature, ozone, and cycling conditions to which the fabric is subjected.
5.4 Fabric specimens are configured in accordance with the requirements of test methods to be conducted on the specimens subsequent to accelerated aging.
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1.1 This practice describes the procedures for the accelerated aging of inflatable restraint fabrics when required as a preparatory step for other test methods.
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Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions

SIGNIFICANCE AND USE
5.1 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.
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5.1 Test Method F2656/F2656M states that variable-width barriers shall be tested in minimum- and maximum-width configurations. Interpolations between maximum and minimums are allowed if there are no structural modifications made to the barrier (that is, all structural components, including spacing of support members and connections, are similar between the two barriers tested at minimum and maximum widths). Extrapolation outside of the tested minimum- and maximum-width configurations is not allowed.
5.2 However, there is a class of barriers such as some nets and fences that rely on a structurally repetitive interior system and strengthened end terminals or anchorages that are not explicitly treated under Test Method F2656/F2656M. There are situations where the interior system of the barrier could be exceptionally long and it is impractical or impossible to test the maximum-width configuration due to test facility site constraints, as an example.
5.3 When a variable-width barrier is dependent on a structurally repetitive interior system that could be exceptionally long and terminated with strengthened end terminals, this practice shall be used to establish the maximum-width configuration that is equivalent to an infinitely long barrier.
5.4 This practice shall be used with Test Method F2656/F2656M to establish a condition designation and penetration rating for the complete variable-width barrier. Knowing the condition designation and penetration rating provides the ability to select an appropriate barrier for site-specific conditions around a facility.
5.5 Use of this practice assumes:
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1.1 This practice provides a procedure for applying Test Method F2656/F2656M test criteria to an exceptionally long (that is, 300 ft [91 m] or greater) variable-width vehicle barrier as defined by Test Method F2656/F2656M.
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1.4 This practice applies only when it is impractical or impossible to install the maximum-width test article of a variable-width barrier because the test facility site constraints limit the practical length of the test article.
1.5 This practice does not apply when its use is employed solely with the intent of reducing the test article installation cost when it is practical to test the maximum-width installation length.
1.6 This practice does not apply to continuous or other types of vehicle barriers.
1.7 This practice shall be used with Test Method F2656/F2656M to establish a condition designation and penetration rating for the complete variable-width barrier. Further, the complete variable-width barrier shall receive a single penetration rating that is determined as the maximum penetration rating for both the minimum- and maximum-width configurations tested, and is taken to be the final penetration rating. The penetration rating is not based on engineering calculation or judgment.
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