1、Designation:F243305(Reapproved 2013)Standard Test Method forDetermining Thermoplastic Pipe Wall Stiffness1This standard is issued under the fixed designation F2433;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revi
2、sion.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 determination of the load-deflection behavior of thermoplastic pipe wall sections underparallel plate lo
3、ading conditions.NOTE1These are not full pipe section tests,but pipe wall segmenttests.The results of these tests will be different from pipe stiffness tests perTest Method D2412,although they may be proportional.This test providesquite different information,including,stress relaxation under constan
4、tstrain,and comparisons of the function and stiffness of different pipe walldesigns or materials.1.2 This test method covers a loading test for determiningthe wall stiffness of a thermoplastic-pipe wall under a com-bined load of bending and compression.Changes in pipe wallprofile geometry under load
5、 may also be determined.1.3 This test method covers thermoplastic pipe.1.4 The characteristics determined by this test method arewall stiffness and changes in profile wall dimensions at specificdeformations.1.5 The characteristics determined by this test method arewall stiffness,profile wall efficie
6、ncy,and for some wallelements stability at specific Strain levels.1.6 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.7 The text of this specification references notes andfootnotes that provide explanatory material.These notes
7、 andfootnotes(excluding those in tables and figures)shall not beconsidered as requirements of the specification.1.8 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
8、 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD695 Test Method for Compressive Properties of RigidPlasticsD883 Terminology Relating to PlasticsD1600 Terminolog
9、y forAbbreviated Terms Relating to Plas-ticsD2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsD2412 Test Method for Determination of External LoadingCharacteristics of Plastic Pipe by Parallel-Plate LoadingF412 Terminology Relating to Plastic Piping Systems2.2 AASHTO St
10、andards:M 252 Standard Specification for Corrugated PolyethyleneDrainage Pipe3M 294 Standard Specification for Corrugated PolyethylenePipe,300-to 1500-mm Diameter33.Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology F412,and abbreviations are in accordance with Termi-nology D1
11、600,unless otherwise specified.3.2 Definitions of Terms Specific to This Standard:3.2.1 chord shortening,nthe ratio of the reduction in pipesection chord shortening to the initial chord length expressed asa percentage.3.2.2 y,nmeasured change in chord length(in thedirection of load application)expre
12、ssed in millimeters(inches).3.2.2.1 compressive deformation,nthe measured changeof the inside diameter in the direction of load applicationexpressed in millimeters(or inches).3.2.3 load(F),nthe force applied to the wall section toproduce or maintain a given percent chord length shortening atany give
13、n unit of time;expressed as Newtons per meter(pounds-force per linear inch).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.1,2013.Published October 2013.Ori
14、ginallyapproved in 2005.Last previous edition approved in 2009 as F243305(2009).DOI:10.1520/F2433-05R13.2For 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 Doc
15、ument Summary page onthe ASTM website.3Available from American Association of State Highway and TransportationOfficials(AASHTO),444 N.Capitol St.,NW,Suite 249,Washington,DC 20001,http:/www.transportation.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-29
16、59.United States1 3.2.4 mean radius(r),nthe mid-wall radius determined bysubtracting the average wall thickness from the average outsidediameter and dividing the difference by two;expressed inmillimeters(or inches).3.2.5 time-independent pipe stiffness K(0),nthe valueobtained by dividing the force per unit length on the curvedbeam specimen by the resulting deflection in the same units atthe%deflection prescribed and extrapolating the linear portionof the curve of stiffness versus%deflection to t
