1、Designation:D142421Standard Test Method forTearing Strength of Fabrics by Falling-Pendulum(Elmendorf-Type)Apparatus1This standard is issued under the fixed designation D1424;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers the determina
3、tion of the forcerequired to propagate a single-rip tear starting from a cut in afabric and using a falling-pendulum(Elmendorf-Type)appa-ratus.1.2 This test method applies to most fabrics includingwoven,layered blankets,napped pile,blanket,and air bagfabrics,provided the fabric does not tear in the
4、directioncrosswise to the direction of the force application during thetest.The fabrics may be untreated,heavily sized,coated,resin-treated,or otherwise treated.Instructions are provided fortesting specimens with,or without,wetting.1.3 This test method is suitable only for the warp directiontests of
5、 warp-knit fabrics.It is not suited for the coursedirection of warp knit fabrics or either direction of most otherknitted fabrics.1.4 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 beap
6、proximate.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior t
7、o use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarrie
8、rs to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD629 Test Methods for Quantitative Analysis of TextilesD1776 Practice for Conditioning and Testing TextilesD2261 Test Method for Tearing Strength of Fabrics by theTongue(Single Rip)Procedure(Cons
9、tant-Rate-of-Extension Tensile Testing Machine)D2904 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)3D4848 Terminology Related to Force,Deformation an
10、dRelated Properties of TextilesD4850 Terminology Relating to Fabrics and Fabric TestMethodsD5587 Test Method for Tearing Strength of Fabrics byTrapezoid Procedure3.Terminology3.1 For all terminology relating to D13.59,Fabric TestMethods,General,refer to Terminology D4850.3.2 For all terminology rela
11、ting to Force,Deformation andRelated Properties in Textiles,refer to Terminology D4848.3.2.1 The following terms are relevant to this standard:cross-machine direction,CD,length of tear,machine direction,MD,tearing energy,tearing force,tear resistance,tearingstrength,fabric.3.3 For all other terminol
12、ogy related to textiles,refer toTerminology D123.4.Summary of Test Method4.1 Aslit is centrally precut in a test specimen held betweentwo clamps and the specimen is torn through a fixed distance.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibil
13、ity of Subcommittee D13.60 on Fabric Test Methods,Specific.Current edition approved July 1,2021.Published August 2021.Originallyapproved in 1956.Last previous edition approved in 2019 as D1424 09(2019).DOI:10.1520/D1424-21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact
14、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 C
15、700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the Worl
16、d Trade Organization Technical Barriers to Trade(TBT)Committee.1The resistance to tearing is in part factored into the scalereading of the instrument and is computed from this readingand the pendulum capacity.5.Significance and Use5.1 This test method for the determination of tearingstrength by the falling pendulum type apparatus is used in thetrade for the acceptance testing of commercial shipments offabrics,but caution is advised since technicians may fail to getgood agreement between results
