1、Designation: D 3787 07Standard Test Method forBursting Strength of TextilesConstant-Rate-of-Traverse(CRT) Ball Burst Test1This standard is issued under the fixed designation D 3787; 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This test method describe
3、s the measurement for burstingstrength with a ball burst strength tester of textiles or garmentsthat exhibit a high degree of ultimate elongation.1.2 The values stated in SI units are to be regarded as thestandard.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separat
4、ely as the standard. Within the test,the inch-pound units are shown in parenthesis. The valuesstated in each system are not exact equivalents; therefore, eachsystem may be used independently of the other. Combiningvalues from the two systems may result in nonconformancewithin the specification.NOTE
5、1For the measurement of bursting strength with a hydraulictesting machine, refer to Test Method D 3786.1.4 This standard may involve hazardous materials, opera-tions and equipment. This standard does not purport to addressall of the safety concerns, if any, associated with its use. It isthe responsi
6、bility of the user of this standard to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D76 Specification for Tensile Testing Machines for TextilesD 123 Terminology Relating to TextilesD
7、1776 Practice for Conditioning and Testing TextilesD 3786 Test Method for Bursting Strength of TextileFabricsDiaphragm Bursting Strength Tester MethodD 4850 Terminology Relating to Fabric3. Terminology3.1 For all terminology relating to D13.59, Fabric TestMethods, General, refer to Terminology D 485
8、0.3.1.1 The following terms are relevant to this standard:bursting strength, constantrate-of-traverse (CRT) tensile test-ing machine, fabric, knitted, fabric, nonwoven.3.2 For all other terminology related to textiles, refer toTerminology D 123.4. Summary of Test Method4.1 A specimen is securely cla
9、mped without tension be-tween grooved, circular plates of the ball burst attachmentsecured to the pulling (movable) jaw for the constant-rate-of-traverse (CRT) testing machine. A force is exerted against thespecimen by a polished, hardened steel ball that is attached tothe pendulum-actuating (fixed)
10、 clamp of the machine, untilrupture occurs.5. Significance and Use5.1 This test method for the determination of ball burstingstrength of textiles is being used by the textile industry for theevaluation of a wide variety of fabrics.5.2 Test results obtained using the procedures in TestMethod D 3787 h
11、ave not been correlated with actual perfor-mance. Test Method D 3787 is considered satisfactory foracceptance testing of commercial shipments of textiles fabricsfor bursting strength since the method has been used exten-sively in the trade for acceptance testing. In cases of disagree-ment arising fr
12、om differences in values reported by thepurchaser and the seller when using Test Method D 3787 foracceptance testing, the statistical bias, if any, between thelaboratory of the purchaser and the laboratory of the sellershould be determined with comparison based on testing speci-mens randomly drawn f
13、rom one sample of material of the typebeing evaluated.NOTE 2The kind force transfer and strength that occur when knittedgoods are worn is prevented by clamping them as directed in this testmethod.1This test method is under the jurisdiction of ASTM Committee D13 on Textilesand is the direct responsib
14、ility of D13.59 on Fabric Test Methods, General.Current edition approved July 1, 2007. Published August 2007. Originallyapproved in 2001. Last previous edition approved in 2001 as D 378701.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at servic
15、eastm.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.5.2.1 If there are differences of practical significance
16、be-tween reported test results for two (or more) laboratories,comparative tests should be performed to determine if there isa statistical bias between them. The test samples used shouldbe: as homogeneous as possible, drawn from the material fromwhich the disparate test results were obtained, and ran
17、domlyassigned in equal numbers to the laboratories for testing. Othermaterials with established test values may be used for thispurpose. The test results from the two laboratories should becompared using a statistical test for unpaired data at aprobability level chosen prior to the testing series. I
18、f a bias isfound, either the cause must be determined and corrected orfuture test results must be adjusted in consideration of knownbias.6. Apparatus6.1 Constant-Rate-of-Traverse (CRT) Tensile Testing Ma-chine (CRT), as specified in Specification D 76, with a ball-burst attachment replacing the clam
19、p assembly.6.2 Ball-Burst Attachment,3consisting of an attachmenthaving a polished steel ball that replaces the fixed clamp of thetensile tester and of a ring-clamp mechanism that replaces thepulling (moving) clamp of the tensile tester (see Fig. 1).Movement of the ring clamp pushes the fabric in th
20、e ring clampagainst the steel ball.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 diameter of 44.450 6 0.025 mm (1.750 6 0.001 in).7. Sampling7.1 Lot SampleTake a lot
21、 sample as directed in theapplicable material specification. In the absence of such aspecification, randomly select the rolls or pieces of fabric thatconstitute the lot sample using the following schedule:Number of Rolls or Piecesin Lot, InclusiveNumber of Rolls or Piecesin Lot Sample1to3 all4to24 4
22、25 to 50 5Over 50 10 % or a maximum of 10 of therolls or pieces7.2 Laboratory SamplesFrom each roll or piece of fabricselected from the lot sample, cut at least one laboratory samplethe full width of the fabric and at least1m(1yd)along theselvage. From each roll or piece of circular knit fabric sele
23、ctedfrom the lot sample, cut a band at least 300 mm (1 ft.) wide.3The sole source of supply of the apparatus known to the committee at this timeis Ball Bursting Attachment, manufactured by the Physical Testing EquipmentServices 2 Morgan Mill Road Central Industrial Park Johnson, RI 02919. If you are
24、aware of alternative suppliers, please provide this information to ASTM Interna-tional Headquarters. Your comments will receive careful consideration at a meetingof the responsible technical committee,1which you may attend.FIG. 1 Ball Burst AttachmentD37870728. Selection and Number of Specimens8.1 U
25、nless otherwise agreed upon, as when specified in anapplicable material specification, take five specimens of thelaboratory sample(s) of fabric. Each specimen shall be at least125 mm (5 in) square, or a circle 125 mm (5 in) in diameter.Specimens need not be cut for testing. No two specimensshould co
26、ntain the same warp and filling or wale and courseyarns. Take no specimens nearer the selvage than one tenth thefabric width. This restriction does not apply to tubular knittedfabric.9. Conditioning9.1 Bring the specimens (or laboratory samples) from theprevailing atmosphere to moisture equilibrium
27、for testingtextiles in the standard atmosphere for testing as prescribed inPractice D 1776.10. Procedure10.1 Make all tests on samples conditioned in the standardatmosphere for testing as specified in 9.1.10.2 Place the specimen without tension in the ring clampand fasten securely by means of the sc
28、rew or lever device. Startthe CRT tensile testing machine, using a pulling clamp speed of305 6 13 mm/min (12 6 0.5 in./min), and continue at thatspeed until the specimen bursts. Record to the nearest 0.5 N(0.1 lb) the ball-bursting strength of the specimen.11. Calculation11.1 Calculate the average b
29、ursting force to the nearest 0.5N (0.1 lb) for each laboratory sample and for the lot.12. Report12.1 State that the specimens were tested as directed inASTM Test Method D 3787. Describe the material or productsampled, and the method of sampling used.12.2 Report the bursting strength of each specimen
30、 and theaverage bursting strength of the five specimens from eachlaboratory sample to the nearest 0.1 lbf (0.5 N).13. Precision and Bias13.1 Interlaboratory Test Dataan interlaboratory test wasrun in 1990 in which randomly drawn specimens of threefabrics were tested in each of four laboratories. The
31、 fabricswere circular knit, stabilized knit and brushed knit fabrics. Thecomponents of variance for bursting strength results expressedas variance are reported in Table 1.NOTE 3The difference in variability between the two groups offabrics is attributed to the differences between the source yarns ra
32、ther thanthe type of equipment on which the fabrics were knit. There is no objectiveevidence to support this supposition.13.2 Critical DifferencesFor the components of variancereported in 13.1, two averages of observed values should beconsidered significantly different at the 95 % probability leveli
33、f the difference equals or exceeds the critical differences listedin Table 2 (Note 4).NOTE 4The tabulated values of the critical differences should beconsidered to be a general statement particularly with respect to between-laboratory precision. Before a statement can be made about two specificlabor
34、atories, the amount of statistical bias, if any, between them must beestablished, with each comparison being based on recent data obtained onspecimens randomly drawn from a sample taken at random from a lot ofthe material to be evaluated.13.3 BiasThe procedure of this test method produces atest valu
35、e 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.414. Keywords14.1 bursting strength; knitted fabric; nonwoven fabric4Supporting data have been filed at ASTM International Headquarters and
36、maybe obtained by requesting Research Report RR: D131086.TABLE 1 Components of Variance for Bursting StrengthExpressed as VarianceWithinLaboratoryComponentBetweenLaboratoryComponentCotton Circular Knit 2.31 6.75Brushed Warp Knit 0.76 5.22D3787073ASTM International takes no position respecting the va
37、lidity 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 infringement of such rights, are entirely their own responsibility.This standard is su
38、bject 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 for additional standardsand should be addressed to ASTM International Headqu
39、arters. 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 known to the ASTM Committee on Standards, at the address shown below.This stand
40、ard 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 ser
41、viceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 2 Critical Difference for Bursting Strength for theMaterials Noted, PoundsNumber ofObservationsIn EachAverageSingleOperatorPrecisionWithinLaboratoryPrecisionBetweenLaboratoryPrecisionSingle Material 5 5.9 5.9 10.510 4.2 4.2 9.615 3.4 3.4 9.320 3.0 3.0 9.1Multi-Material 5 5.9 5.9 14.910 4.2 4.2 14.315 3.4 3.4 14.120 3.0 3.0 13.9D3787074
