ASTM_D_6797_-_15.pdf

Designation:D679715Standard 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 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 describes the measurement for burstingstrength of woven and knitted textiles taken from rolls of fabricor fabric taken from garments.NOTE1For 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 D3787NOTE2Constant Rate of Traverse(CRT)machines and Constant Rateof Extension(CRE)machines have been shown to provide differentresults.When using a CRT device,refer to Test Method D3787.1.2 The values stated 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 user 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 Interlaboratory Testing of a Textile TestMethod that Produces Normally Distributed Data(With-drawn 2008)3D2906 Practice for Statements on Precision and Bias forTextiles(Withdrawn 2008)3D3786 Test Method for Bursting Strength of TextileFabricsDiaphragm Bursting Strength Tester MethodD3787 Test Method for Bursting Strength of TextilesConstant-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-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 clamped 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 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 differences 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 homogeneous 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 resultsfrom the laboratories involved should be compared using astatistical test for unpaired data,at a probability level chosen1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.59 on Fabric Test Methods,General.Current edition approved July 1,2015.Published September 2015.Originallyapproved in 2002.Last previous edition approved in 20011 as D679707(2011).DOI:10.1520/D6797-15.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 prior to the testing 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 clampingmechanism to hold the test specimen and a steel ball attachedto the mo