1、Designation:D647911 Designation: D6479 12Standard Test Method forDetermining the Edgecomb Resistance of Woven FabricsUsed in Inflatable Restraints1This standard is issued under the fixed designation D6479; the number immediately following the designation indicates the year oforiginal adoption or, in
2、 the case of revision, the 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 the procedures for determining the resistance to edgecombin
3、g of a woven fabric used in inflatablerestraints.1.2 Procedures and apparatus other than those stated in this standard may be used by agreement of purchaser and supplier withthe specific deviations from the standard practice acknowledged in the report.1.3 The values stated in SI units are to be rega
4、rded as standard. No other units of measurement are included in this standard.1.4 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 and health practices and deter
5、mine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D1776 Practice for Conditioning and Testing TextilesD123 Terminology Relating to TextilesD2904 Practice for Interlaboratory Testing of a Textile Test Method that Produces Normally Distributed Data
6、 D2906D2906 Practice for Statements on Precision and Bias for TextilesD5035 Test Method for Breaking Force and Elongation of Textile Fabrics (Strip Method)D5822 Test Method for Determining Seam Strength in Inflatable Restraint CushionsD6799 Terminology Relating to Inflatable RestraintsE691 Practice
7、for Conducting an Interlaboratory Study to Determine the Precision of a Test Method3. 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: edgecombing, inflatable restraint, seam slippage, ya
8、rn slippage3.2 For all other terms related to textiles, see Terminology D123.3.3 Definitions:3.4 For definitions of other terms used in this standard, refer to Terminology D123 and Terminology D6799.4. Summary of Test Method4.1 One end of a test specimen is clamped within one jaw of a CRE tensile te
9、sting machine and a special fixture pierces a rowof equally spaced needle holes through the opposite end of the specimen. In accordance with Test Method D5035, a tensile forceis applied to the specimen until rupture occurs. The measurement of the force required to cause rupture is the measurement of
10、edgecomb resistance.5. Significance and Use5.1 A measurement of a fabrics edgecomb resistance indicates the relative tendency of a fabric to pull apart under seam stressor similar action. The related concepts of yarn slippage and seam slippage are limited to sewn seams, whereas the measurementof edg
11、ecomb resistance is made at the edge of a cut part in the absence of a sewn seam. The absence of a sewn seam in this testmethod eliminates the effect that a particular stitch might have on the tendency of a yarn to slip near an edge of a cut part1This test method is under the jurisdiction of ASTM Co
12、mmittee D13 on Textiles and are the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.Current edition approved MayJuly 1, 2011.2012. Published May 2011.August 2012. Originally approved in 1999. Last previous edition approved in 20082011 asD647908.D6479 11. DOI: 10.1520/D6479-112.
13、2For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.1This document is not an ASTM standard and is intended only
14、 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 changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versio
15、nof 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, United States.5.2 This test method is useful for material design evaluations in such applications as airbags in which se
16、am stress is a majorconcern.5.3 This method may be used as a complement to Test Method D5822.6. Apparatus6.1 Tensile Testing MachineA constant-rate-of-extension (CRE) type, that is designed for the tensile forces anticipated, thatis operated at a rate of 200 6 10 mm/min, that has a force range selec
17、ted such that the anticipated break occurs between 10 and90 % of full scale load, and that has jaws and grip faces as agreed upon by purchaser and supplier.6.2 Clamps, jaws with smooth, flat, parallel faces a minimum of 60 mm wide by 25 mm tall. The jaws may be padded or coatedunder the jaw face are
18、a. , jaws with smooth, flat, parallel faces a minimum of 60 mm wide by 25 mm tall. The jaws may be paddedor coated under the jaw face area and should be mounted in the upper position in the tensile testing machine.6.3 Fixture, compatible with tensile tester, equipped with twelve equally spaced 1 mm
19、diameter pins with sharp points, 8 mmin length and corresponding 1.5 mm diameter holes with a stop located 5 mm from the center of the holes (Fig. 1). ). The fixtureshould be properly centered with the upper clamps and their surfaces should be aligned (not twisted).6.4 Load Cell, whose rated capacit
20、y is between 110 and 1000 % of expected stripping load. A2000 N load cell is generally usedfor inflatable restraints.6.5 For inflatable restraints, all test equipment used in accordance with this test method shall be certified for calibration annuallyby an independent agency or equipment manufacture
21、r whose results are traceable to National Institute of Science and Technology(NIST) or other national standards laboratory. The test parameters of the equipment shall be tested within the operating rangescovered in the cushion specification or equivalent document.7. Sampling and Specimen Preparation
22、7.1 Edgecomb resistance testing is a destructive test. If used in conjunction with lot testing, sampling is required.7.2 For acceptance testing the lot size is the number of rolls of fabric produced in one production day, or as specified in theapplicable material specification.7.3 From the end of ea
23、ch roll of fabric taken from the lot sample, cuta1mlong, full width sample of fabric.7.4 From the laboratory sample, select five test specimens each from the warp and fill directions (Fig. 2).7.5 Without sealing or unraveling the edges, cut each specimen 50 6 1 mm wide and 300 6 5 mm long, with the
24、long dimensionparallel to the warp yarns for a warp-oriented test, and parallel to the fill yarns for a fill-oriented test.FIG. 1 FixtureD6479 1227.6 A final cut should be made to the edge that is inserted into the edgecomb fixture to ensure a continuous full yarn is present.8. Conditioning8.1 Speci
25、mens for edgecomb resistance testing shall be conditioned at the standard atmosphere for testing textiles for at least4 h prior to test in accordance with Test Method D1776.9. Procedure9.1 Prepare the tensile testing machine in accordance with Test Method D5035.9.2Set the gage length between clamps
26、at 200 61 mm.9.2 Set the gage length between the bottom edge of the upper clamp to the top surface of the edge comb fixture to 200 6 1 mm.9.3 Select the force range of the testing machine for the break to occur between 10 and 90 % of full-scale force. Calibrate orverify the testing machine for this
27、range.9.4 Set the testing machine for a loading rate of 200 6 10 mm/min.9.5 Ensure proper clamping as directed by Test Method D5035.9.6 Mount one end of the specimen into the bottom clamp position of the edgecomb fixture, ensuring that the end of thespecimen abuts flatly and evenly against the align
28、ment block, parallel to and behind the pinholes.9.7 Pierce the end of the specimen with the 12 1.0 mm pins and secure the hinge.9.8 Mount the opposite end of the specimen securely in the opposite clamp of the testing machine in accordance with TestMethod D5035. Ensure that the specimen is not pulled
29、 and the yarns displaced. . Ensure that the specimen is not pulled and theyarns displaced. Ensure specimen alignment is adjusted to present a 90 angle where the specimen intersects the grip or fixture,or both.9.9 Operate the machine and break the specimen in accordance with Test Method D5035.9.10 Re
30、cord the breaking force separately for both the warp and fill directions. Determine the median of the break forcesobserved for all specimens tested.10. Report10.1 State that the tests were conducted in accordance with this test method.FIG. 2 Test SpecimensD6479 12310.2 If deviation from this test me
31、thod occurred, any reference to this standard shall state: “Testing was performed inaccordance with ASTM D6479, with the following changes:”10.3 The purchaser and supplier shall determine the exact form of the test report. Unless otherwise specified, the form shallprovide the following information:1
32、0.3.1 Lot identification,10.3.2 Date of report,10.3.3 Name of person certifying report,10.3.4 Relevant specification,10.3.5 Number of specimens used in each test10.3.6 Tests performed and data obtained,10.3.7 Laboratory conditions if other than standard, and10.3.8 Deviations from standard procedures
33、 and apparatus.11. Precision and Bias11.1 An interlaboratory test was conducted in accordance with Practice D2904 and Practice E691. A precision and biasstatement based on the interlaboratory report is being developed in accordance with Practice D2906.D6479 12411.2 Raw Data Table:Fabric A Fabric B F
34、abric Cdata in N force PA 6,6 470 dtex PA 6,6 470 dtex PA 6,6 700 dtex18318 25 gsm Si 21321 Uncoated 16316 25 gsm SiWarp Fill Warp Fill Warp FillLab 1 Specimen 1 303 308 705 474 303 308Specimen 2 319 306 780 394 320 306Specimen 3 324 278 679 530 324 278Specimen 4 326 275 585 430 326 275Specimen 5 31
35、3 304 678 516 313 304Lab 2 Specimen 1 352 351 970 815 469 416Specimen 2 343 341 904 895 469 428Specimen 3 341 329 990 865 442 424Specimen 4 350 339 931 807 458 418Specimen 5 358 337 942 936 467 414Lab 3 Specimen 1 375 325 861 714 419 356Specimen 2 359 325 942 663 415 368Specimen 3 356 318 939 887 39
36、9 398Specimen 4 349 312 1058 923 402 374Specimen 5 352 340 1003 1000 427 377Lab 4 Specimen 1 349 340 683 648 446 420Specimen 2 363 340 693 653 433 432Specimen 3 352 346 687 636 465 420Specimen 4 354 334 670 673 437 456Specimen 5 346 342 750 599 452 406Lab 5 Specimen 1 346 328 731 615 436 417Specimen
37、 2 356 334 760 629 428 387Specimen 3 361 314 800 613 404 403Specimen 4 359 335 970 743 430 416Specimen 5 359 332 787 702 449 399Lab 6 Specimen 1 376 517 791 746 438 462Specimen 2 391 390 867 882 381 504Specimen 3 389 414 876 1258 486 470Specimen 4 344 355 867 1141 425 446Specimen 5 370 393 962 661 4
38、37 516Lab 7 Specimen 1 340 325 836 773 561 425Specimen 2 333 341 927 713 600 433Specimen 3 333 293 863 697 513 388Specimen 4 344 317 841 746 474 412Specimen 5 345 311 834 774 496 418Lab 8 Specimen 1 341 342 873 722 448 381Specimen 2 359 361 924 789 454 428Specimen 3 353 335 840 866 444 432Specimen 4
39、 334 391 861 742 412 403Specimen 5 352 340 919 819 461 418Lab 9 Specimen 1 309 291 589 448 388 315Specimen 2 321 290 670 402 314 297Specimen 3 292 279 605 389 325 314Specimen 4 314 282 704 418 342 338Specimen 5 296 284 665 489 322 363Lab 10 Specimen 1 330 289 885 616 393 397Specimen 2 347 293 821 72
40、5 438 399Specimen 3 331 308 818 705 403 420Specimen 4 324 318 774 693 417 446Specimen 5 351 311 771 752 436 414Lab 11 Specimen 1 316 305 701 718 417 438Specimen 2 329 371 843 753 428 441Specimen 3 348 320 794 676 443 436Specimen 4 356 312 860 791 433 407Specimen 5 326 307 821 717 437 43111.3 The pre
41、cision statement below was generated by The ASTM E691 software package.11.3.1 The number of laboratories, materials, and determinations in this study DOES NOT meet the minimum requirements fordeterminating precision prescribed in ASTM Practice E691:ThisStudyASTM E691MinimumLaboratories 11 6Materials
42、 3 4Determinations 5 211.3.2 Precision Statement for Test Method: Warp-NPrecision, characterized by repeatability, Sr, r, and reproducibility, SR, Rhas been determined for the materials to be:Materials Avg. SrSRr R18318 470 Sil 342.67 11.45 21.63 32.05 60.58D6479 12521321 470 Unc 816.36 57.31 115.91
43、 160.48 324.5516316 700 Sil 423.62 24.36 60.93 68.21 170.6011.3.3 Precision Statement for Test Method: Fill-NPrecision, characterized by repeatability, Sr, r, and reproducibility, SR, Rhas been determined for the materials to be:Materials Avg. SrSRr R18318 470 Sil 329.05 23.37 40.54 65.45 113.502132
44、1 470 Unc 708.75 98.47 179.12 275.72 501.5516316 700 Sil 397.85 22.55 58.49 63.13 163.7711.3.4 This precision statement is provisional. Within five years, additional data will be obtained and processed which does meetthe requirements of E691.12. Keywords12.1 airbag; break force; edgecomb resistance;
45、 inflatable restraintASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringemen
46、t of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or f
47、or additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views know
48、n to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D6479 126
