1、Designation:D342021Standard Test Method forPendulum Impact Resistance of Plastic Film1This standard is issued under the fixed designation D3420;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 par
2、entheses 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 the determination of resistanceof film to impact-puncture penetration.Knowledge of how theimpact energy is absorbed by the spec
3、imen while it is deform-ing under the impact loading,and the behavior of the specimenafter yielding,is not provided by this test.No provision is madefor nonambient temperatures in this test method.1.2 The values stated in SI units are to be regarded as thestandard.1.3 This standard does not purport
4、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.Specific hazards statements are given i
5、n Section 7.NOTE1There is no known ISO equivalent to this standard.1.4 This international standard was 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-mend
6、ations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1709 Test Methods for Impact Resistance of Plastic Filmby the Free-Falling Dart Me
7、thodD1922 Test Method for Propagation Tear Resistance ofPlastic Film and Thin Sheeting by Pendulum MethodD4272 Test Method for Total Energy Impact of Plastic Filmsby Dart DropD6988 Guide for Determination of Thickness of Plastic FilmTest SpecimensE456 Terminology Relating to Quality and StatisticsE6
8、91 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 DefinitionsFor definition of terms used in this testmethod and associated with plastics issues refer to the termi-nology contained in D883.For terms relating to precision andbias and associ
9、ated issues,the terms used in this standard aredefined in accordance with Terminology E456.3.2 Definitions of Terms Specific to This Standard:3.2.1 failure completion energythe energy necessary toinitiate failure plus the energy necessary to cause completerupture to the test specimen.3.2.2 failure i
10、nitiated energythe energy necessary to beginfailure of the test specimen.3.2.3 pendulum impact resistancethe resistance to failureof plastic film is measured by loss in mechanical work capacitydue to the expenditure of kinetic energy by a pendulum.4.Summary of Test Method4.1 The energy necessary to
11、burst and penetrate the centerof a specimen,mounted between two plates with a circularaperture,is measured by the loss in mechanical work-capacitydue to the expenditure of kinetic energy by a pendulum,therounded probe of which passes through the test specimen.Corrections for“toss factor”or kinetic e
12、nergy imparted to thepuncture fragment of the test specimen are not made,as onlytiny masses are involved.The pendulum head hits the speci-men with a maximum velocity of about 74 m/min and amaximum energy of about 5 J(50 cmkgf).5.Significance and Use5.1 Like other techniques to measure toughness,this
13、 testmethod provides a means to determine parameters of a materialat strain rates closer to some end-use applications than pro-vided by low-speed uniaxial tensile tests.Dynamic tensilebehavior of a film is important,particularly when the film isused as a packaging material.The same uncertainties abo
14、utcorrelations with thickness that apply to other impact tests alsoapply to this test(see section 3.4 of Test Methods D1709).1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.19 on Film,Sheeting,andMolded Products.Curren
15、t edition approved May 1,2021.Published May 2021.Originallyapproved in 1975.Last previous edition approved in 2014 as D3420 14.DOI:10.1520/D3420-21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards v
16、olume 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,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 th