1、Designation:D6693/D6693M20Standard Test Method forDetermining Tensile Properties of NonreinforcedPolyethylene and Nonreinforced Flexible PolypropyleneGeomembranes1This standard is issued under the fixed designation D6693/D6693M;the number immediately following the designation indicates theyear of or
2、iginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the tensileproperties o
3、f nonreinforced geomembranes in the form ofstandard dumbbell-shaped test specimens when tested underdefined conditions of pretreatment,temperature,and machinespeed.1.2 This test method can be used for testing materialsthickness between 0.25 mm 0.010 in.and 6.3 mm 0.25 in.NOTE1This test method is not
4、 intended to precisely measure physicalproperties of a geomembrane for design purposes.This is an“index test”intended to be used for quality control and specification conformancepurposes.The constant rate of crosshead movement of this test lacksaccuracy from a theoretical standpoint,since crosshead
5、movement asopposed to actual strain is used.A wide difference may exist between therate of crosshead movement and the rate of strain in particular areas of thespecimen since the specimen does not have a uniform width or cross-sectional area.This may disguise important effects or characteristics ofth
6、ese materials in the plastic state.Use of an extensometer,not includedin this test,would more accurately measure strain and strain rate butwould still have limitations for some geomembranes.Further,it is realizedthat variations in the thicknesses of test specimens,as permitted by thistest method,pro
7、duce variations in the surface-volume ratios of suchspecimens,and that these variations may influence the test results.Hence,where directly comparable results are desired,all samples should be ofequal thickness.Special additional tests should be used where moreprecise physical data are needed.Test M
8、ethod D4885 is a suitableperformance test for many applications.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not necessarily exact equivalents;therefore,toensure conformance with the standard,each system sha
9、ll beused independently of the other,and values from the twosystems shall not be combined.1.4 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 environmen
10、tal practices and deter-mine the applicability of regulatory limitations prior to use.1.5 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,Gu
11、ides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D374/D374M Test Methods for Thickness of Solid Electri-cal InsulationD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD638 Te
12、st Method for Tensile Properties of PlasticsD4000 Classification System for Specifying Plastic Materi-alsD4439 Terminology for GeosyntheticsD4885 Test Method for Determining Performance Strengthof Geomembranes by the Wide Strip Tensile MethodD5199 Test Method for Measuring the Nominal Thicknessof Ge
13、osyntheticsD5994/D5994M Test Method for Measuring Core Thicknessof Textured GeomembranesE4 Practices for Force Verification of Testing MachinesE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE2586 Practice for Calculating and Using Basic Statistics3.Te
14、rminology3.1 DefinitionsDefinitions of terms applying to this testmethod appear in Terminology D4439.1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.10 on Geomem-branes.Current edition approved July 1,2020.Publish
15、ed July 2020.Originally approvedin 2001.Last previous edition approved in 2015 as D6693/D6693M 04(2015)1.DOI:10.1520/D6693_D6693M-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume informati
16、on,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 Barriers to Trade(TBT)Committee.4.Significa
