ASTM D5822-2013 red 4375 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 D5822-2013 red 4375 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 D5822-2013 red 4375 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(7页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D5822 08D5822 13Standard Test Method forDetermining Seam Strength in Inflatable RestraintCushions1This standard is issued under the fixed designation D5822; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of l
2、ast 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 the measurement of seam efficiency and the maximum seam strength in inflatable restraint cushio
3、nscomposed of woven fabrics when a force is applied perpendicular to the seam, using a grab test. For evaluating sewing thread, referto Test Method D204.1.2 This test method is restricted to seams that are either obtained from an inflatable restraint cushion. cushion or preparedoff-line, specificall
4、y for testing, using fabric blanks, not obtained from a previously sewn cushion assembly. Seams may includebut are not limited to sewn, OPW, glued, sealed and sewn, or fused (chemically or thermally). This test method can be used foreither lot testing of production cushions, or for research and deve
5、lopment purposes.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 restraintuse.1.4 Procedures an
6、d apparatus other than those stated in this standard may be used by agreement between purchaser and supplierwith 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 sta
7、ted in eachsystem 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 responsibilityof the user of this standard to establish appropriate safety
8、and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD204 Test Methods for Sewing ThreadsD1776 Practice for Conditioning and Testing TextilesD6799 Terminology Relating to Inflatable
9、Restraints3. Terminology3.1 For all terminology relating to D13.20, Inflatable restraints, refer to Terminology D6799.3.1.1 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 D123.4. Summary of
10、Test Method4.1 Specimens with and without seam assemblies either taken from inflatable restraint cushions or made off-line using fabricblanks, specifically for testing, are destructively tested in a tensile testing machine under laboratory conditions to determine seamstrength and seam efficiency. ef
11、ficiency and nature of the failure mode.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, 2008Jan. 1, 2013. Published July 2008February 2013. Originally appr
12、oved in 1995. Last previous edition approved in 20072008 asD5822 03D5822 08.(2007). DOI: 10.1520/D5822-08.10.1520/D5822-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, ref
13、er to the standards Document Summary page on the ASTM website.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. Becauseit may not be technically possible to adequately depict all ch
14、anges accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959.
15、United States15. Significance and Use5.1 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 either seams takenfrom inflatable restraint cushions, or seam types that can p
16、otentially be used for inflatable restraint cushions are tested for seamstrength and seam efficiency.strength, seam efficiency, and failure mode. It is intended to be used as a guideline in establishing awritten part specification or print. The specification or agreement of purchaser and supplier ma
17、y deviate from the proceduresdescribed herein when (based on experience) considerations of equipment, cushion design, or other factors dictate otherwise.5.3 In cases of dispute arising from differences in reported test results when using this test method for acceptance testing ofcommercial shipments
18、, the purchaser and the supplier should perform comparative tests to determine if there is a statistical biasbetween their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the twoparties should take a group of test specimens from the same lot
19、 of fabric to be evaluated, which utilize a like seam assembly (orstandard seam assembly) to achieve seam interaction. The test specimens should then be randomly assigned in equal numbers toeach laboratory for testing. If a bias is found, either its cause must be determined and corrected, or the pur
20、chaser and supplier mustagree to interpret future test results in light of the known bias.5.4 Test Method D5822 is a reliable test method but procedures which may require special attention are identified in theprecision and bias section of this test method.6. Apparatus6.1 Tensile Testing Machine, of
21、 the CRE, CRL or CRT type conforming to Specification D76, with respect to force indication,working range, capacity, and elongation indicator, and designed for operation at a speed of 300 6 10 mm/min (12 6 0.5 in./min);or, a variable speed drive, change gears, or interchangeable weights as required
22、to obtain a 20 6 3-s time-to-break (see 12.4). Theconstant-rate-of-extension type of tensile testing machine is preferred in this test method.6.2 Clamp and Jaw Faces, adjustable clamps compatible with tensile testing machine, the jaws of which have smooth, flat,metallic gripping surfaces parallel to
23、 each other.6.2.1 Each clamp shall have a front (or top) jaw face measuring 25 6 1 mm (1.0 6 0.02 in.) perpendicular to the direction ofthe application of the force, and not less than 25 nor more than 50 mm (1.0 nor more than 2.0 in.) parallel to the direction of theapplication of the force. The bac
24、k, or bottom, jaw face of each clamp shall be at least as large as its mate. Use of a larger facefor the second jaw reduces the problem of front and 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
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