1、Designation: D6797 07 (Reapproved 2011)Standard Test Method forBursting Strength of Fabrics Constant-Rate-of-Extension(CRE) Ball Burst Test1This standard is issued under the fixed designation D6797; the number immediately following the designation indicates the year oforiginal adoption or, in the ca
2、se 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 describes the measurement for burstingstrength of woven and knitted texti
3、les taken from rolls of fabricor fabric taken from garments.NOTE 1For the measurement of bursting strength with a hydraulic orpneumatic machine, refer to Test Method D3786. For the measurement ofthe bursting strength by means of a ball burst mechanism, refer to TestMethod D37871.2 The values stated
4、in either SI units or U.S. customaryunits are to be regarded as standard, but must be usedindependently of each other. The U.S. customary units may beapproximate.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the u
5、ser 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:2D123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD2904 Practice for In
6、terlaboratory Testing of a Textile TestMethod that Produces Normally Distributed DataD2906 Practice for Statements on Precision and Bias forTextiles3D3786 Test Method for Bursting Strength of TextileFabricsDiaphragm Bursting Strength Tester MethodD3787 Test Method for Bursting Strength of TextilesCo
7、nstant-Rate-of-Traverse (CRT) Ball Burst TestD4850 Terminology Relating to Fabrics and Fabric TestMethods3. Terminology3.1 For all terminology related to D13.59, Fabric TestMethods, General, see Terminology D4850.3.1.1 The following terms are relevant to this standard:bursting strength, constantrate
8、-of-traverse (CRT) tensile test-ing machine, fabric.3.2 For definitions of all other textile terms see TerminologyD123.4. Summary of Test Method4.1 Set up the tensile tester for performing the ball burst testin accordance with the manufactures instructions. A specimenof the fabric is securely clampe
9、d to the CRE machine withouttension to the ball burst attachment. A force is exerted againstthe specimen by a polished, hardened steel ball until ruptureoccurs.5. Significance and Use5.1 This method is used to determine the force required torupture textile fabric by forcing a steel ball through the
10、fabricwith a constant-rate-of-extension tensile tester.5.2 This is a new method and therefore the history of data isvery small, however the agreement of within- laboratory datasuggest this method may be considered for acceptance testingof commercial shipments with caution.5.2.1 If there are differen
11、ces of practical significance be-tween reported test results for two laboratories (or more),comparative test should be performed to determine if there is astatistical bias between them, using competent statistical assis-tance. As a minimum, samples used for such comparative testshould be as homogene
12、ous as possible, drawn from the samelot of material as the samples that resulted in disparate resultsduring initial testing, 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 me
13、thod is under the jurisdiction of ASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.59 on Fabric Test Methods,General.Current edition approved July 1, 2007. Published August 2007. Originallyapproved in 2002. Last previous edition approved in 2002 as D679702. DOI:10.1
14、520/D6797-07.2For 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 onthe ASTM website.3Withdrawn. The last approved version of this hi
15、storical standard is referencedon www.astm.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.from the laboratories involved should be compared using astatistical test for unpaired data, at a probability level chosenprior to the tes
16、ting series. If bias is found, either its cause mustbe found and corrected, or future test results for that fabricmust be adjusted in consideration of the known bias.6. Apparatus6.1 Tensile Testing Machine4, of the constant-rate-of- exten-sion (CRE) type.6.2 Ball-Burst Attachment4, consisting of a c
17、lampingmechanism to hold the test specimen and a steel ball attachedto the moveable member of the tensile tester.6.2.1 The polished steel ball shall have a diameter of 25.4006 0.005 mm (1.0000 6 0.0002 in.) and shall be sphericalwithin 0.005 mm (0.0002 in.). The ring clamp shall have aninternal diam
18、eter of 44.450 6 0.025 mm (1.750 6 0.001 in.).7. Sampling, Selection, and Number of Specimens7.1 Primary Sampling UnitConsider rolls, bolts or piecesof fabric, or cartons of fabric components of fabricated systemssuch as garments to be the primary sampling unit, as appli-cable.7.2 Laboratory Samplin
19、g UnitAs a laboratory samplingunit take from the primary sampling unit at least one full-widthpiece of fabric that is1m(1yd)inlength along the selvage(machine direction), after removing the first1m(1yd)length.For circular knit fabrics cut a band at least 300 mm (12 in.)wide. When applicable, use the
20、 entire fabric component of thefabricated systems.7.3 Test Specimen SelectionFrom each laboratory sam-pling unit, take five test specimens. Specimen preparation neednot be carried out in the standard atmosphere for testing. Labelto maintain specimen identity.7.3.1 When the end-use fabric component o
21、f fabricatedsystems is provided, take specimens 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.
22、) from the selvage edge.7.3.3 For fabric widths 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 fab
23、ric. Take widthwise specimens from different 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 sa
24、mpling of the pattern.7.4 Specimen PreparationAs test specimens from eachlaboratory sampling unit, proceed as follows:7.4.1 For fabrics, cut five specimens at least 125 3 125 mm(5 3 5 in.).7.4.2 Garments may not require cutting if the equipment hasample room to clamp the garment in the apparatus. Fi
25、vedeterminations should be made on each garment.8. Conditioning8.1 Bring the specimens (or laboratory samples) from theprevailing atmosphere to moisture equilibrium for testingtextiles in the standard atmosphere for testing as prescribed inPractice D1776.9. Procedure9.1 Unless otherwise specified, m
26、ake all tests on samplesconditioned in the standard atmosphere for testing as specifiedin 8.1.9.2 Place the specimen without tension in the ring clampand fasten securely. Start the CRE machine and maintain aspeed of 305 6 13 mm/min (12 6 0.5 in./min). Continue thatspeed until the specimen bursts. Re
27、cord to the nearest 5 N (1.0lbf) the ball-bursting strength of the specimen.10. Report10.1 State that the specimens were tested as directed in TestMethod D6797. Describe the material or product sampled, andthe method of sampling used.10.2 Report the bursting strength of each specimen and theaverage
28、bursting strength of the five specimens from eachlaboratory sample to the nearest 0.5 N (0.1 lbf).11. Precision and Bias11.1 SummaryBased upon limited information from onelaboratory, the single-operator and within-laboratory compo-nents of variation and critical differences shown in Tables 1and 2 ar
29、e approximate. These tables are constructed to illustratewhat one laboratory found when all the observations are takenby the same well-trained operators using the same piece ofequipment and specimens randomly drawn from the sample ofmaterial. For this laboratory, in comparing two averages, thediffer
30、ences should not exceed the single-operator precisionvalues shown in Table 2 for the respective number of tests in 95out of 100 cases. Differences for other laboratories may belarger or smaller.11.2 Single-Laboratory Test DataA single-laboratory testwas run in 1997 in which randomly-drawn samples of
31、 twowoven materials were tested. Two operators in the laboratoryeach tested ten specimens from each mate. Five of the tenspecimens were tested on one day and five specimens weretested on a second day. Analysis of the data was conducted4Apparatus is commercially available.TABLE 1 Grand Average and Co
32、mponents of VarianceExpressed as Standard DeviationsAfor Bursting StrengthConstant-Rate-of-Extension (CRE) Ball Burst Method, lbfGrand Averageand ComponentMaterial 1 Material 2Grand Average 172.2 131.2Single-Operator Component 8.1 9.0Within-Laboratory Component 0 0AThe square roots of the components
33、 of variance are being reported to expressthe variability in the appropriate units of measure rather than as the squares ofthose units of measure.D6797 07 (2011)2using Practices D2904 and D2906. The components of vari-ance for Bursting StrengthConstant-Rate-Of-Extension(CRE) Ball Burst Method expres
34、sed as standard deviationswere calculated to be the values listed in Table 1.11.3 PrecisionBecause tests were conducted in only onelaboratory estimates of between laboratory precision may beeither underestimated or overestimated to a considerable extentand should be used with special caution. Before
35、 a meaningfulstatement can be made about two specific laboratories, theamount of statistical bias, if any, between them must beestablished, with each comparison being based on recent dataobtained on specimens taken from a lot of material of the typebeing evaluated so as to be as nearly homogeneous a
36、s possibleand then randomly assigned in equal numbers to each of thelaboratories. However when agreed upon between the contrac-tual parties, for the approximate components of variancereported in Table 1, two averages of observed values may beconsidered significantly different at the 95 % probability
37、 levelif the difference equals or exceeds the critical differences listedin Table 2, for Bursting Strength-Constant-Rate-of-Extension(CRE) Ball Burst Method.11.4 BiasThe value of Bursting Strength-Constant-Rate-of-Extension (CRE) Ball Burst Method can only be defined interms of a test method. Within
38、 this limitation, Test MethodD6797 has no known bias.12. Keywords12.1 ball burst; bursting strengthASTM 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 deter
39、mination of the validity of any such patent rights, and the riskof infringement 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
40、withdrawn. Your comments are invited either for revision of this standard or 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
41、 your comments have not received a fair hearing you shouldmake your views known 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 (
42、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 web
43、site (www.astm.org/COPYRIGHT/).TABLE 2 Critical Differences for Bursting StrengthConstant-Rate-of-Extension (CRE) Ball Burst Method, lbf, for theConditions NotedAMaterialsNumber of Observationsin Each AverageSingle-OperatorPrecisionWithin-LaboratoryPrecisionMaterial 1 1 22.4 22.42 15.9 15.95 10.0 10.010 7.1 7.1Material 2 1 25.0 25.02 17.7 17.75 11.2 11.210 7.9 7.9AThe critical differences were calculated using t = 1.960, which is based oninfinite degrees of freedom.D6797 07 (2011)3
