1、Designation:D244417Standard Practice forDetermination of the Impact Resistance of ThermoplasticPipe and Fittings by Means of a Tup(Falling Weight)1This standard is issued under the fixed designation D2444;the number immediately following the designation indicates the year oforiginal adoption or,in t
2、he 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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This p
3、ractice covers the determination of the impactresistance of thermoplastic pipe and fittings under specifiedconditions of impact by means of a tup(falling weight).Threeinterchangeable striking noses are used on the tup,differing ingeometrical configuration.Two specimen holders are de-scribed.NOTE1App
4、endix X1 shows the procedure to determine impactstrength.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not pu
5、rport 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 environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard w
6、as developed in accor-dance with internationally 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
7、Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsF412 Terminology Relating to Plastic Piping Systems3.Terminology3.1 DefinitionsD
8、efinitions are in accordance with Termi-nology F412,and abbreviations are in accordance with Termi-nology D1600,unless otherwise specified.3.2 Definitions of Terms Specific to This Standard:3.2.1 tupThe striking part of a falling hammer like mecha-nism.4.Significance and Use4.1 The impact resistance
9、 of thermoplastic pipe and fittingsrelates to suitability for service and to quality of processing.Impact resistance may also provide a relative measure of amaterials resistance to breakage during handling and installa-tion and,for non-buried applications,to in-service breakage.See Appendix X5 for g
10、uidelines for selecting testing combi-nations.4.2 Results obtained by use of this practice can be used inthree ways:4.2.1 As the basis for establishing impact test requirementsin product standards,4.2.2 To measure the effect of changes in materials orprocessing,and4.2.3 To measure the effect of the
11、environment.5.Apparatus5.1 GeneralOne type of impact tester is illustrated in Fig.1.5.2 Tup:5.2.1 The tup nose shall be as shown in Fig.2.When usedwith the 0.50-in.(12.7-mm)radius nose,it is designated as TupA.When used with the 2.00-in.(51-mm)radius nose,it isdesignated as Tup B.When used with the
12、0.25-in.(6.3-mm)radius nose,it is designated as Tup C.NOTE2It is suggested that tups be made of scratch-resistant steel toreduce damage to the nose.Badly scarred noses may affect test results.5.2.2 The mass of the tup shall be 6,12,20,or 30 lb(2.7,5.4,9.1,or 13.6 kg).1This pracitce is under the juri
13、sdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.40 on TestMethods.Current edition approved Nov.15,2017.Published February 2018.Originallyapproved in 1965.Last previous edition approved in 2010 as D2444 99(2010).DOI:10.1520/D2444-17.2For re
14、ferenced 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 International,100 Barr Harbor Drive,PO Box C700,West Consh
15、ohocken,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 Organi
16、zation Technical Barriers to Trade(TBT)Committee.1 5.3 Drop Tube:5.3.1 The drop tube shall be of sufficient length(approxi-mately 12 ft(3.7 m)to provide for a fall of at least 10 ft(3.0m)and shall be mounted so that the lengthwise direction isvertical as measured with a plumb bob or a spirit level at least2 ft(610 mm)in length.5.3.2 Care must be taken to ensure that the tup falls freely;it must not“chatter”down the tube.NOTE3No material for the drop tube is specified.However,acolddrawn seamless