ASTM_F_2018_-_00_2010.pdf

Designation:F201800(Reapproved 2010)Standard Test Method forTime-to-Failure of Plastics Using Plane Strain TensileSpecimens1This standard is issued under the fixed designation F2018;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 covers the requirements to determinethe time-to-failure of thermoplastic resins for piping applica-tions by uniaxial loading of a grooved tensile test specimen.This grooved tensile specimen achieves a multi-axial stresscondition,which mimics the stress condition found in pressur-ized solid-wall plastic pipe.The ratio of the stress in the axialdirection to the transverse direction approximates that for apressurized solid-wall pipe specimen.1.2 It is intended that the data generated on these specimensbe analyzed according to the methodology set forth in TestMethod D2837 to generate a long-term strength design valuefor the material.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1598 Test Method for Time-to-Failure of Plastic PipeUnder Constant Internal PressureD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD2837 Test Method for Obtaining Hydrostatic Design Basisfor Thermoplastic Pipe Materials or Pressure Design Basisfor Thermoplastic Pipe ProductsD2990 Test Methods for Tensile,Compressive,and FlexuralCreep and Creep-Rupture of PlasticsD1928 Practice for Preparation of Compression-MoldedPolyethylene Test Sheets and Test Specimens(Withdrawn2001)3D4703 Practice for Compression Molding ThermoplasticMaterials into Test Specimens,Plaques,or SheetsF412 Terminology Relating to Plastic Piping Systems2.2 Other Document:PPI TR-4 HDB Listed Materials43.Terminology3.1 Definitions:3.1.1 Definitions are in accordance with Terminology F412,and abbreviations are in accordance with Terminology D1600.3.1.2 long-term strength(LTS)the estimated tensile stressin the test specimen that when applied continuously will causefailure of the specimen at 100 000 h.This is the intercept of thestress regression line with the 100 000-h coordinate.4.Summary of Test Method4.1 This test method consists of a description of the groovedtensile test specimen and its use in various environments toobtain the long-term strength capacity for piping materials.Such a controlled environment may be accomplished by,but isnot limited to,immersing the specimens in a controlled-temperature water bath or circulating-air oven.5.Significance and Use5.1 The data obtained by this test method are useful forestablishing stress versus failure-time relationships in a con-trolled environment.The long-term strength(LTS)is deter-mined primarily for materials used in molding applications.The LTS categorized in accordance with Table 1 of ASTMD2837 is known as the SDB(strength design basis).NOTE1These SDB values will be published in PPI TR-4 for materialsused in molding applications only.1This test method is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.40 on TestMethods.Current edition approved Aug.1,2010.Published November 2010.Originallyapproved in 2000.Last previous edition approved in 2006 as F201800(2006).DOI:10.1520/F2018-00R10.2For 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.4Available from Plastics Pipe Institute(PPI),105 Decker Court,Suite 825,Irving,TX 75062,http:/www.plasticpipe.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 The test method can also be used on an experimentalbasis for pipe-grade materials as an indicator of stress-ruptureperformance.The long-term strength or SDB values obtainedby this test method are not intended to replace the HDBdetermined for pressure pipe tested in accordance with TestMethod D1598.5.3 In order to determine how plastics will perform in pipefitting applications,it is necessary to establish the stress-failuretime relationships over four or more decades of time(hours)ina controlled environment.Because of the nature of the test andspecimens employed,no single line can adequately representthe data,and therefore the confide