ASTM D6478-2008 516 Standard Test Method for Determining Specific Packability of Fabrics Used in Inflatable Restraints.pdf
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1、Designation: D 6478 08Standard Test Method forDetermining Specific Packability of Fabrics Used inInflatable Restraints1This standard is issued under the fixed designation D 6478; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers procedures for determining theability to fold and pack fabrics used for inflatable res
3、traintsusing an index of specific packability.1.2 Procedures in this test method describe operator tech-niques that must be followed closely to obtain repeatable andaccurate results. Since these techniques are difficult to conveyin writing, supplemental training for operators is required. Atraining
4、video is available from ASTM (see AdjunctsADJD6478 and ADJD6478A and ).1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system are not exact equivalents; therefore, each systemmust be used independent of the other.1.4 Pro
5、cedures and apparatus other than those stated in thispractice may be used as agreed upon between the purchaserand the supplier with specific deviations from this practiceacknowledged in the report.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its us
6、e. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices, and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 123 Terminology Relating to TextilesD 1776 Practice for Conditioning and
7、 Testing TextilesD 2904 Practice for Interlaboratory Testing of a Textile TestMethod that Produces Normally Distributed DataD 2906 Practice for Statements on Precision and Bias forTextilesD 6799 Terminology Relating to Inflatable RestraintsE 691 Practice for Conducting an Interlaboratory Study toDet
8、ermine the Precision of a Test Method2.2 ASTM Adjuncts:ADJD6478 17 Detailed Drawings3ADJD6478A- Videotape-Supplemental Training33. Terminology3.1 For all terminology relating to D13.20, Inflatable re-straints, refer to Terminology D 6799.3.1.1 The following terms are relevant to this standard:inflat
9、able restraint, packability, specific packability.3.2 For all other terms related to textiles, see TerminologyD 123.4. Summary of Practice4.1 Afabric specimen is folded uniformly in a “Z” pattern inthe warp and fill directions.4.2 The folded specimen is placed into a transparent boxthat confines the
10、 specimen securely during compression.4.3 The folded specimen is compressed using a tensile testeroutfitted with special hardware, and the resulting volume isrecorded at specified loads. The total of all the individualvolumes recorded at each specified cell is the specific pack-ability of the fabric
11、.5. Significance and Use5.1 This test method is useful for determining the specificpackability of uncoated and coated airbag fabrics. Fabricpackability is an important factor in the design of airbagmodules due to their inherent spacial contraints.5.2 A folded specimen exhibits better specific packab
12、ility ifit occupies a lower total volume at the specified loads com-pared to another specimen.5.3 The time required to test one sample (four specimensfrom the same lot of fabric) is approximately 1.5 h using thistest method. Due to the length of time required by this testmethod to perform a single t
13、est, this test method is mostsuitable for use in design and development analysis or for1This test method is under the jurisdiction of ASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.Current edition approved July 1, 2008. Published July 2
14、008. Originally approvedin 1999. Last previous edition in 2007 as D 647802(2007)2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page
15、onthe ASTM website.3Available from ASTM International Headquarters. For 17 Detailed CADDrawings, Order Adjunct No. ADJD6478. For Videotape-Supplemental Training,Order ADJD6478A.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.inclusio
16、n in a list of required tests conducted for annualcertification of an airbag fabric.6. Apparatus6.1 Tensile Tester, outfitted with a rigid base to support thespecimen box, and a compression foot attached to the load cellwith a coupling having adjustment and locking capability tomaintain fixed parall
17、el alignment to the base. Tensile testershould be calibrated annually by an independent agency whoseresults are traceable to the National Institute of Science andTechnology (NIST) or other national standards laboratory.NOTE 1The frame of the tensile tester can be used as the rigid base ifit is a sol
18、id metal surface which can support compression loading of 200Nwithout deforming, is perfectly flat, and supports the entire footprint of thespecimen box.6.2 Apparatus Manufactured in Accordance With Drawings4(See Fig. 1):6.2.1 Rectangular Box , 100 by 1506 0.1mm with 99 by149 6 0.1 mm cover plate co
19、nstructed of transparent polycar-bonate material.6.2.2 Rectangular Template and Rotary Cutting Pad, 750 by800 mm 6 0.5 mm , for cutting specimens from fabric samples(optional).6.2.3 Jig, consisting of two sets of slats (wide and narrow)for making the folds and a frame that holds the slats in positio
20、nduring folding.6.2.4 Compression Gage Blocks, with thickness of 10, 20and 30 6 0.1 mm.6.2.5 All dimensions shall be verified at time of manufac-ture using measuring devices traceable to the National Instituteof Science and Technology (NIST) or other national standardslaboratory.6.3 Rotary Razor Cut
21、ter.6.4 Large Paperclips (Three), preferably with a serratedsurface to improve gripping capability.6.5 Permanent Marking Pen, pen with fine tip.7. Specimen Preparation7.1 Condition fabric samples for a minimum of3hinthestandard atmosphere for testing textiles in accordance withPractice D 1776.7.2 Wi
22、thout fraying or fusing the edges, cut four 750 by 8006 5 - mm specimens from each sample, with the 800 mmdimension aligned in the warp direction and the cuts alignedwith the warp and weft yarns in the fabric.7.3 Write the fabric sample identification and the specimennumber on the lower right corner
23、 of the specimen (warp yarnsrunning up/down and weft yarns running right/left relative tothe operator) at a location about 50 mm from the bottom edgeand 50 mm from the right edge.8. Procedure8.1 Tensile Tester Set-Up and Calibration Check:8.1.1 Set tensile tester for compression mode, install loadce
24、ll with maximum force rating of 200 to 1000N, set crossheadspeed to 25.0 6 1.0 mm/min, set data acquisition equipment torecord thickness with an accuracy of 0.1 mm at loads of 20 to180N in 20N increments (nine total points), set samplingfrequency at $ 25 Hz and set test endpoint at 200N8.1.2 Mount t
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