ASTM D5822-2003(2007) Standard Test Method for Determining Seam Strength in Inflatable Restraint Cushions《测定充气缓冲垫接缝强度的标准试验方法》.pdf
《ASTM D5822-2003(2007) Standard Test Method for Determining Seam Strength in Inflatable Restraint Cushions《测定充气缓冲垫接缝强度的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D5822-2003(2007) Standard Test Method for Determining Seam Strength in Inflatable Restraint Cushions《测定充气缓冲垫接缝强度的标准试验方法》.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 5822 03 (Reapproved 2007)Standard Test Method forDetermining Seam Strength in Inflatable RestraintCushions1This standard is issued under the fixed designation D 5822; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, t
2、he year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the measurement of seamefficiency and the maximum seam strength in inflatable re-s
3、traint cushions composed of woven fabrics when a force isapplied perpendicular to the seam, using a grab test. Forevaluating sewing thread, refer to Test Method D 204.1.2 This test method is restricted to seams that are obtainedfrom an inflatable restraint cushion. Seams may include but arenot limit
4、ed to sewn, OPW, glued, fused (chemically or ther-mally).1.3 This test method is used when the measurement of aresistance to a specified force, a breaking force, a minimumelongation, or a combination thereof are required to determinethe seam strength, or seam integrity of a particular fabric forinfl
5、atable restraint use.1.4 Procedures and apparatus other than those stated in thisstandard may be used by agreement between purchaser andsupplier with the specific deviations from the standard ac-knowledged in the report.1.5 The values stated in either SI units or inch-pound unitsare to be regarded s
6、eparately as standard. The values stated ineach system are not exact equivalents; therefore, each systemmust be used independently of the other.1.6 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standa
7、rd 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 204 Test Methods for Sewing ThreadsD 1776 Practice for Conditioning and Testing Textiles
8、D 3990 Terminology Relating to Fabric Defects3. Terminology3.1 Definitions:3.1.1 seam effciency, nin inflatable restraints, the ratio ofseam strength to fabric strength.3.1.2 seam failure, nin inflatable restraints, the point atwhich an external force ruptures a seam assembly or the fabric,or causes
9、 excessive yarn slippage adjacent to the seam assem-bly.3.1.3 seam strength, nin inflatable restraints, the maxi-mum force required to create a seam failure.3.2 For definitions of textile terms relating to inflatablerestraints used in this standard, refer to Terminology D 3990.3.3 For definitions of
10、 other textile terms used in thisstandard, refer to Terminology D 123.4. Summary of Test Method4.1 Specimens with and without seam assemblies takenfrom inflatable restraint cushions are destructively tested in atensile testing machine under laboratory conditions to deter-mine seam strength and seam
11、efficiency.5. Significance and Use5.1 Seam strength testing is used for design validation andfor lot acceptance.5.2 This test method constitutes the conditions, procedures,and equipment by which inflatable restraints are tested forseam strength and seam efficiency. It is intended to be used asa guid
12、eline in establishing a written part specification or print.The specification or agreement of purchaser and supplier maydeviate from the procedures described herein when (based onexperience) considerations of equipment, cushion design, orother factors dictate otherwise.5.3 In cases of dispute arisin
13、g from differences in reportedtest results when using this test method for acceptance testingof commercial shipments, the purchaser and the suppliershould perform comparative tests to determine if there is astatistical bias between their laboratories. Competent statisticalassistance is recommended f
14、or the investigation of bias. As aminimum, the two parties should take a group of test speci-mens from the same lot of fabric to be evaluated, which utilizea like seam assembly (or standard seam assembly) to achieve1This test method is under the jurisdiction of ASTM Committee D13 on Textilesand is t
15、he direct responsibility of Subcommittee D13.20 on Inflatable Restraints.Current edition approved July 1, 2007. Published August 2007. Originallyapproved in 1995. Last previous edition approved in 2003 as D 5822 03.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM
16、Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.seam interaction. The test spec
17、imens should then be randomlyassigned in equal numbers to each laboratory for testing. If abias is found, either its cause must be determined and cor-rected, or the purchaser and supplier must agree to interpretfuture test results in light of the known bias.5.4 Test Method D 5822 is a reliable test
18、method butprocedures which may require special attention are identified inthe precision and bias section of this test method.6. Apparatus6.1 Tensile Testing Machine, of the CRE, CRL or CRT typeconforming to Specification D 76, with respect to force indi-cation, working range, capacity, and elongatio
19、n indicator, anddesigned for operation at a speed of 300 6 10 mm/min (12 60.5 in./min); or, a variable speed drive, change gears, orinterchangeable weights as required to obtain a 20 6 3-stime-to-break (see 12.4). The constant-rate-of-extension typeof tensile testing machine is preferred in this tes
20、t method.6.2 Clamp and Jaw Faces, adjustable clamps compatiblewith tensile testing machine, the jaws of which have smooth,flat, metallic gripping surfaces parallel to each other.6.2.1 Each clamp shall have a front (or top) jaw facemeasuring 25 6 1 mm (1.0 6 0.02 in.) perpendicular to thedirection of
21、 the application of the force, and not less than 25nor more than 50 mm (1.0 nor more than 2.0 in.) parallel to thedirection of the application of the force. The back, or bottom,jaw face of each clamp shall be at least as large as its mate. Useof a larger face for the second jaw reduces the problem o
22、f frontand back jaw misalignment.NOTE 1Front (or top) faces measuring 25 by 50-mm (1.0 by 2.0-in.)will not necessarily give the same value as 25 by 25-mm (1.0 by 1.0-in.)faces. For many materials, the former are preferable because of the largergripping area which tends to reduce slippage. While both
23、 sizes of grippingsurface are permitted, the face sizes used must be the same for all samplesin the test and must be recorded in the report.6.2.2 At least one clamp should be supported by a freeswivel or universal joint to allow the clamp to rotate in theplane of the fabric.6.3 For inflatable restra
24、ints, all test equipment used inaccordance with this test method shall be certified for calibra-tion annually by an independent agency or equipment manu-facturer whose results are traceable to the National Institute ofScience and Technology (NIST) or other national standardslaboratory. The test para
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- ASTMD582220032007STANDARDTESTMETHODFORDETERMININGSEAMSTRENGTHININFLATABLERESTRAINTCUSHIONS 测定 充气 缓冲 接缝
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