ASTM D6614-2007(2011) 1875 Standard Test Method for Stretch Properties of Textile Fabrics - CRE Method《纺织物弹性的标准试验方法 - 等速伸长法》.pdf

《ASTM D6614-2007(2011) 1875 Standard Test Method for Stretch Properties of Textile Fabrics - CRE Method《纺织物弹性的标准试验方法 - 等速伸长法》.pdf》由会员分享，可在线阅读，更多相关《ASTM D6614-2007(2011) 1875 Standard Test Method for Stretch Properties of Textile Fabrics - CRE Method《纺织物弹性的标准试验方法 - 等速伸长法》.pdf（3页珍藏版）》请在麦多课文档分享上搜索。

1、Designation: D6614 07 (Reapproved 2011)Standard Test Method forStretch Properties of Textile Fabrics CRE Method1This standard is issued under the fixed designation D6614; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of

2、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 determination of the amountof fabric stretch and fabric growth after a specified extension

3、and held for a specified time.1.2 While this method can be used for any fabric, knitfabrics having high stretch are better measured by test methodD2594.1.3 This test method should not be used to measure thebreaking strength and elongation of woven fabrics, which iscovered in Test Methods D5034 and D

4、5035.1.4 The values listed in either SI units or inch-pound unitsare to be regarded separately as the standard. Within the text,the inch-pound units are shown in parentheses. The valuesstated in each system are not exact equivalents; therefore, eachsystem shall be used independently of the other. Co

5、mbiningvalues from the two systems may result in nonconformancewith specification.1.5 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 standard to establish appro-priate safety and health practices and d

6、etermine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD2594 Test Method for Stretch Properties of Knitted Fab-rics Having Low PowerD4849 Terminology Relate

7、d to Yarns and FibersD4850 Terminology Relating to Fabrics and Fabric TestMethodsD5034 Test Method for Breaking Strength and Elongationof Textile Fabrics (Grab Test)D5035 Test Method for Breaking Force and Elongation ofTextile Fabrics (Strip Method)3. Terminology3.1 For all terminology relating to D

8、13.59, Fabric TestMethods, General, see Terminology D4850.3.2 For all terminology related to D13.58, Yarns and Fiber,see Terminology D4849.3.2.1 The following terms are relevant to this standard:fabric stretch, fabric growth, stretch yarn.3.3 For definitions of all other textile terms see Terminolog

9、yD123.4. Summary of Test Method4.1 Fabric Stretch and Fabric Growth A specified load isapplied to a fabric specimen, using a constant rate of extensiontensile tester at a prescribed rate of extension. After holding atthe specified load for a predetermined time, the length ismeasured. The load is rem

10、oved from the specimen and allowedto relax for a specified time. A small amount of force, enoughto remove any wrinkles or folds, is applied and the specimenlength measured. The amount of fabric stretch is calculatedfrom the difference in length prior to load and under load.Fabric growth is calculate

11、d from the difference in length priorto loading and after relaxation.5. Significance and Use5.1 This method is used to determine the stretch and growthproperties which a garment made of the fabric may be expectedto exhibit during use.5.2 This is a new method and therefore the history of data isvery

12、small, however the excellent agreement of between-laboratory data suggest this method may be considered foracceptance testing of commercial shipments.5.2.1 If there are differences of practical significance be-tween reported test results for two laboratories (or more),comparative test should be perf

13、ormed to determine if there is astatistical bias between them, using competent statistical assis-tance. As a minimum, samples used for such comparative testsshould be as homogeneous as possible, drawn from the samelot of material as the samples that resulted in disparate resultsduring initial testin

14、g, and randomly assigned in equal numbersto each laboratory. Other fabrics with established test valuesmay also be used for these comparative tests. The test results1This test method is under the jurisdiction of ASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.59 on

15、 Fabric Test Methods,General.Current edition approved May 1, 2011. Published July 2011. Originally approvedin 2000. Last previous edition approved in 2007 as D661407. DOI: 10.1520/D6614-07R11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at ser

16、viceastm.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.from the laboratories involved should be compared usin

17、g astatistical test for unpaired data, at a probability level chosenprior to the testing series. If bias is found, either its cause mustbe found and corrected, or future test results must be adjustedin consideration of the known bias.6. Apparatus6.1 Tensile Testing Machine3, of the CRE type with cap

18、a-bility to maintain a constant load and measurement of thelocation of the moveable crosshead.6.2 Grips and Jaw Faces, a minimum of 50 mm (2 in.) facesto hold the full width of the specimen.7. Sampling, Selection, and Number of Specimens7.1 Primary Sampling UnitConsider rolls, bolts or piecesof fabr

19、ic, or cartons of fabric components of fabricated systemssuch as garments to be the primary sampling unit, as appli-cable.7.2 Laboratory Sampling UnitAs a laboratory samplingunit take from the primary sampling unit at least one full-widthpiece of fabric that is 1M (1 yd) in length along the selvage(

20、machine direction), after removing the first 1M (1 yd) length.For circular knit fabrics cut a band at least 300 mm (12 in.)wide. When applicable, use the entire fabric component of thefabricated systems.7.3 Test Specimen SelectionFrom each laboratory sam-pling unit, take test specimens with the long

21、 direction parallelto the stretch direction. Consider the long direction as thedirection of test. Specimen preparation need not be carried outin the standard atmosphere for testing. Label to maintainspecimen identity.7.3.1 When the end-use fabric component of fabricatedsystems is provided, take spec

22、imens from different areas. Thatis, if the product is a garment worn on the upper body, then takespecimens from the shoulder, shirt tail, shirt back and front,and sleeve.7.3.2 For fabric widths 125 mm (5 in.) or more, take nospecimen closer than 25 mm (1 in.) from the selvage edge.7.3.3 For fabric w

23、idths less than 125 mm (5 in.), use theentire width for specimens.7.3.4 Cut specimens representing a broad distribution di-agonally across the width of the laboratory sampling unit. Takelengthwise specimens from different positions across the widthof the fabric. Take widthwise specimens from differe

24、nt posi-tions along the length of the fabric.7.3.5 Ensure specimens are free of folds, creases, orwrinkles. Avoid getting oil, water, grease, etc. on the specimenwhen handling.7.3.6 If the fabric has a pattern, ensure that the specimensare a representative sampling of the pattern.7.4 Specimen Prepar

25、ationAs test specimens from eachlaboratory sampling unit, proceed as follows:7.4.1 For woven fabrics, cut two strips 65 by 350 mm (2.5by 14 in.) with the long dimension parallel to the stretchdirection.7.4.1.1 Ravel the strips to form test specimens to 50 6 0.5mm (2 6 0.02 in.) width by taking appro

26、ximately the samenumber of yarns from each side of the specimen.7.4.2 For knitted and nonwoven fabrics, cut two test speci-mens, 50 6 0.5 mm (2 6 0.02 in.) wide by 350 mm (14 in.)with the long dimension parallel to the stretch direction.8. Conditioning8.1 Condition each sample as directed in Practic

27、e D1776,prior to cutting the test specimens.9. Preparation and Calibration of Test Apparatus9.1 Set-up procedures for machines from different manufac-turers may vary. Prepare and verify calibration of the tensiletester using directions supplied by the manufacturer.9.2 Set the distance between the ja

28、w faces 250 6 0.5 mm(10 6 0.02 in.).9.3 Select an appropriate extension speed. Fabrics with verylittle stretch should be extended at a slow speed and fabricswith high stretch at a faster speed. The extension speed is notcritical to the test but consideration must be given to theresponse of the test

29、apparatus to ensure the machine stopswithout overriding the stop point and the time required toperform the test.10. Procedure10.1 Make all tests in the standard atmosphere for testingtextiles.10.2 Place one specimen in the upper jaw, making sure thelong direction of the specimen is parallel to the s

30、ides of the jawfaces.10.3 Place the other end of the specimen in the bottom jaw,applying just enough force to remove any folds or wrinkles.10.4 Start the machine and hold at 1814 6 1.0 g (4.0 6 0.02lb.) for 5 6 0.1 min. The electronically controlled machineshould record all the measurements necessar

31、y for the finalcalculations.10.5 If the machine is not electronically controlled, stop thecrosshead at 1814 6 l.0g(46 0.02 lb.) Maintain the load byadjusting the crosshead until 5 6 0.1 min. has elapsed.Measure the distance between the jaw faces.10.6 Return the crosshead to the starting position and

32、 holdfor 5 6 0.1 min.10.7 Move the crosshead to a position where all the slack isremoved or the load increases above the zero load line.Measure the distance between jaw faces at this point.11. Calculations11.1 Calculate the fabric stretch and the fabric growth ofeach specimen to the nearest 0.2 perc

33、ent using Eq 1 and 2.Fabric stretch, percent 5 BA! /A 3 100 (1)Fabric growth, percent 5 CA! /A 3 100 (2)where:A = original distance between jaw faces, (from 9.2)B = distance between jaw faces measured while the speci-mens under 1814 6 1.0g(46 0.02 lb) as directed in10.4 and 10.5, and3Apparatus is co

34、mmercially available.D6614 07 (2011)2C = distance between jaw faces measured after removal ofslack as directed in 10.7.11.2 Calculate the average stretch and fabric growth of allspecimens tested. To the nearest 0.2 % for the laboratorysampling unit and the primary sampling unit.12. Report12.1 State

35、that the specimens were tested as directed in TestMethod D6614. Describe the material or product sampled andthe method of sampling used.12.2 Report the following information:12.2.1 The average percentage fabric stretch and the aver-age fabric growth.13. Precision and Bias13.1 Interlaboratory Test Da

36、taAn interlaboratory test wasperformed in April 1997. Following section 8.1, 2 test speci-mens were cut from each laboratory sample and their stretchand growth measured. The averages of percent stretch andgrowth were calculated as in section 11.2. A total of 10specimens from each of three materials

37、were tested in twolaboratories by a single operator in each laboratory. Thisgenerated 5 averages of 2 specimens as directed in section11.2. Using SAS Proc Varcomp4the within-laboratory andbetween-laboratory components of variance as Standard De-viations for percent stretch and percent growth were de

38、ter-mined. These results appear in Table 1.13.2 PrecisionFor the components of variance reported inTable 1, two averages of observed values should be consideredsignificantly different at the 95 % probability level if thedifference exceeds the critical differences listed in Table 2.Adetermination is

39、the average of 2 specimens as specified insection 11.2.13.3 BiasThe procedure of this test method produces atest value that can be defined only in terms of a test method.There is no independent, referee method by which bias may bedetermined. This test method has no known bias.14. Keywords14.1 fabric

40、 growth; fabric stretchASTM 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 infringem

41、ent 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

42、 for 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 kn

43、own 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 AS

44、TM 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/).4SAS PROC VARCOMP components-of-variance proc

45、edure, available fromSAS Institute, Box 8000, Cary, North Carolina 27511.TABLE 1 Components of Variance, % Stretch, % GrowthSingle-operatorComponentBetween-operatorComponentPercent Stretch 0.189 0.124Percent Growth 0.104 0.116TABLE 2 Critical Difference, % Stretch, % GrowthNumber ofDeterminations Single-operator Between-operatorPer Average Precision Precision% Stretch 1 0.52 0.632 0.37 0.513 0.23 0.41% Growth 1 0.29 0.432 0.20 0.383 0.13 0.35D6614 07 (2011)3