1、Designation:D220900(Reapproved 2021)Standard Test Method forTensile Strength of Leather1This standard is issued under the fixed designation D2209;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 p
2、arentheses 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 determination of the loadrequired to
3、rupture a leather test specimen having a12-in.(12.7-mm)width.The load to rupture divided by the originalunstretched cross-sectional area gives the tensile strength.Itmay be used for all types of leather that are smooth and firmenough to permit accurate thickness measurements.This testmethod does not
4、 apply to wet blue.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of thesafety conc
5、erns,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 to use.1.4 This international standard was developed in accor-dance with inter
6、nationally 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 TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1517 Ter
7、minology Relating to LeatherD1610 Practice for Conditioning Leather and Leather Prod-ucts for TestingD1813 Test Method for Measuring Thickness of LeatherTest SpecimensD2211 Test Method for Elongation of Leather3.Terminology3.1 For definitions of leather terms used in this standardrefer to Terminolog
8、y D1517.4.Summary of Test Method4.1 The width and thickness are measured in the center ofthe narrow area of the leather specimen.The specimen isclamped in the testing machine as described in 9.3.The forcerequired to rupture the leather at a jaw separation of 10 6 2in./min.is measured.The tensile str
9、ength is calculated in psi orin kPa by dividing the force by the area of the original crosssection of its narrow section.The percent elongation at ruptureis also measured.5.Significance and Use5.1 The tensile strength test gives a reliable indication of thequality of the leather.Improperly lubricate
10、d and partiallydegraded leathers give low values for tensile strength.Theorientation of the specimen in relation to the backbone and thelocation of the specimen on the hide influence the resultssignificantly.This test method is excellent for development,control,specification acceptance,and service e
11、valuation ofleather.This test method may not apply when the conditions oftest employed differ widely from those specified in the testmethod.6.Apparatus6.1 Testing Machine,Power-Driven The applied loadshall be indicated on a dial,scale,or chart.The load indicatorshall record or indicate the maximum l
12、oad at the time ofrupture of the specimen.The machine shall be equipped with aset of grips for clamping the specimens.The faces of the gripsshould be knurled or otherwise roughened to prevent slippingof the specimen.The gripping surfaces shall be at least 1 by 112in.(25.4 by 38 mm).The grips shall b
13、e mounted with thelonger dimension perpendicular to the direction of the appli-cation of the load.The speed of the power-activated grip shallbe uniform speed of 10 6 2 in./min(254 6 50 mm/min)whenrunning free.The error of the machine up to a load of 50 lbf(222 N)shall not exceed 2%;at loads of more
14、than 50 lbf theerror shall not exceed 1%.1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.07 on Physical Properties.Thistest method was developed in cooperation with the American Leather ChemistsAssn.(Standard Method E15
15、 1965).Current edition approved Sept.1,2021.Published October 2021.Originallyapproved in 1963.Last previous edition approved in 2015 as D2209 00(2015).DOI:10.1520/D2209-00R21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Ann
16、ual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,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 World Trade Organization Technical B