1、Designation:D539720Standard Test Method forEvaluation of Stress Crack Resistance of PolyolefinGeomembranes Using Notched Constant Tensile Load Test1This standard is issued under the fixed designation D5397;the number immediately following the designation indicates the year oforiginal adoption or,in
2、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 is used to develop test data from whichthe susceptibility of polyolefin g
3、eomembrane sheet material tostress cracking under a constant tensile load condition and anaccelerated environmental condition can be evaluated.1.2 This test method measures the failure time associatedwith a given test specimen at a specified tensile load level.Results from a series of such tests uti
4、lizing a range of loadlevels can be used to construct a stress-time plot on a log-logaxis.1.3 The values stated in SI units are to be regarded as thestandard.The inch-pound units given in parentheses areprovided for information only.1.4 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.1.5 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:2D883 Term
7、inology Relating to PlasticsD4354 Practice for Sampling of Geosynthetics and RolledErosion Control Products(RECPs)for TestingD4439 Terminology for GeosyntheticsD4703 Practice for Compression Molding ThermoplasticMaterials into Test Specimens,Plaques,or SheetsD5199 Test Method for Measuring the Nomin
8、al Thicknessof GeosyntheticsD6693/D6693M Test Method for Determining Tensile Prop-erties of Nonreinforced Polyethylene and NonreinforcedFlexible Polypropylene Geomembranes3.Terminology3.1 Definitions:3.1.1 actual thickness,nindividual measurement per TestMethod D5199,on a specimen tab.3.1.2 average
9、thickness,nresult of Test Method D5199testing,that is,average of ten specimens.3.1.3 geomembrane,nvery low permeability syntheticmembrane liners or barriers used with any geotechnicalengineering-related material so as to control fluid migration ina man-made project,structure,or system.3.1.4 ligament
10、,nthe portion of geomembrane that remainsuncut under the notch.3.1.5 ligament thickness,nlength of the ligament mea-sured from the bottom of the notch to the edge of the specimenin a direction perpendicular to the plane of the test specimen.3.1.6 multi-component geomembrane,na geomembranethat includ
11、es multiple layers of different nature.3.1.7 nominal thickness,nthe thickness specified withoutregard of tolerance.3.1.8 notch,ncut made using a specified tool in prescribedconditions.3.1.9 slow crack growth,ntype of fracture mechanismcharacterized by the stable growth of a crack with littledeformat
12、ion in the material.3.1.10 smooth geomembrane,na geomembrane that doesnot present any surface texture.3.1.10.1 DiscussionA geomembrane can be smooth onone side but textured on the other side.3.2 For definitions of other terms relating to geotextiles andgeomembranes used in this standard,refer to Ter
13、minologiesD4439 and D883.1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.02 on Endur-ance Properties.Current edition approved June 1,2020.Published June 2020.Originallyapproved in 1993.Last previous edition approv
14、ed in 2019 as D5397 19a.DOI:10.1520/D5397-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM Intern
15、ational,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
16、and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.4.Summary of Test Method4.1 This test method consists of subjecting a dumbbell-shaped notched test specimen from a polyolefin sheet to aconstant tensile load in the presence of a surface-active agentand at an elevated temperature.The time to failure of the testspecimen is recorded.The results of a series of such testsconducted at different stress levels are presented by plottingstress level again
