1、Designation:D536512An American National StandardStandard Test Method forLong-Term Ring-Bending Strain of“Fiberglass”(Glass-Fiber-Reinforced Thermosetting-Resin)Pipe1This standard is issued under the fixed designation D5365;the number immediately following the designation indicates the year oforigina
2、l 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.Scope*1.1 This test method covers a procedure for determining thelong-term ring-be
3、nding strain(Sb)of“fiberglass”pipe.Bothglass-fiber-reinforced thermosetting-resin pipe(RTRP)andglass-fiber-reinforced polymer mortar pipe(RPMP)are“fiber-glass”pipes.1.2 The values stated in inch-pound units are to be regardedas the standard.The SI units given in parentheses are forinformation only.1
4、.3 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.A specific warnings
5、tatement is given in 9.5.NOTE1There is no known ISO equivalent to this standard.2.Referenced Documents2.1 ASTM Standards:2D883 Terminology Relating to PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD3567 Practice for Determining Dimensions of“Fiberglass”(Glass-Fiber-Reinforced T
6、hermosetting Resin)Pipe andFittings3.Terminology3.1 Definitions:3.1.1 GeneralDefinitions are in accordance with Termi-nology D883 and abbreviations are in accordance with Termi-nology D1600 unless otherwise indicated.3.2 Definitions of Terms Specific to This Standard:3.2.1 end pointthe failure of th
7、e test specimen.The failuremode may be catastrophic,characterized by a sudden fracturethrough the pipe wall in the area of greatest strain.3.2.2 fiberglass pipetubular product containing glass-fiberreinforcements embedded in or surrounded by curing thermo-setting resin.The composite structure may co
8、ntain aggregate,granular or platelet fillers,thixotropic agents,pigments,ordyes;thermoplastic or thermosetting liners or coatings may beincluded.3.2.3 reinforced polymer mortar pipe(RPMP)fiberglasspipe with aggregate.3.2.4 reinforcedthermosettingresinpipe(RTRP)fiberglass pipe without aggregate.4.Sum
9、mary of Test Method4.1 This test method consists of subjecting submerged-pipering specimens to various increasing deflections induced by aconstant load and monitoring the time to failure.Aminimum of18 samples are required.Test temperatures are obtained bytesting in a fluid environment where the temp
10、erature iscontrolled.4.2 The long-term ring-bending strain is obtained by anextrapolation to 50 years of a log-log linear regression line forfailure strain versus time.NOTE2It is the consensus of Subcommittee D 20.23 that the log-loglinear regression analysis of test data is a conservative approach
11、and isrepresentative of standard industry practice.However,a task group hasbeen formed to evaluate alternative non-linear analysis methods.5.Significance and Use5.1 This test method determines the long-term ring-bendingstrain of pipe when deflected under constant load and im-mersed in a chemical env
12、ironment.It has been found thateffects of chemical environments can be accelerated by straininduced by deflection.This information is useful and necessaryfor the design and application of buried fiberglass pipe.NOTE3Pipe of the same diameter but of different wall thicknesseswill develop different st
13、rains with the same deflection.Also,pipes havingthe same wall thickness but different constructions making up the wallmay develop different strains with the same deflection.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D
14、20.23 on Reinforced PlasticPiping Systems and Chemical Equipment.Current edition approved April 1,2012.Published May 2012.Originallyapproved in 1993.Last previous edition approved in 2006 as D5365-06.DOI:10.1520/D5365-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact AS
15、TM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken
16、,PA 19428-2959.United States1 6.Apparatus6.1 Loading DeviceThe testing apparatus shall be suitablefor maintaining a constant load on the test specimen.6.2 Load ApplicationThe load may be applied to the testspecimens using any of three alternative pairs of parallelloading surfaces;flat plates,rods or bars of a length at least aslong as the pipe ring and of sufficient strength and stiffness toensure a straight loading surface throughout the test.The sametype of loading device shall be used for eac
