ASTM_D_1822_-_21.pdf

Designation:D182221Standard Test Method forDetermining the Tensile-Impact Resistance of Plastics1This standard is issued under the fixed designation D1822;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.Scope*1.1 This test method covers the determination of the energyrequired to rupture standard tension-impact specimens ofplastic materials.Rigid materials are suitable for testing by thismethod as well as specimens that are too flexible or thin to betested in accordance with other impact test methods.1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.NOTE1This test method and ISO 8256 address the same subjectmatter,but differ in technical content.1.3 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.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-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D256 Test Methods for Determining the Izod PendulumImpact Resistance of PlasticsD618 Practice for Conditioning Plastics for TestingD638 Test Method for Tensile Properties of PlasticsD883 Terminology Relating to PlasticsD4000 Classification System for Specifying Plastic Materi-alsD5947 Test Methods for Physical Dimensions of SolidPlastics SpecimensD6988 Guide for Determination of Thickness of Plastic FilmTest SpecimensE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and StatisticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standards:ISO8256 PlasticsDeterminationof Tensile-ImpactStrength3.Terminology3.1 DefinitionsTerms used in this standard are defined inaccordance with Terminology D883,unless otherwise speci-fied.For terms relating to precision and bias and associatedissues,the terms used in this standard are defined in accordancewith Terminology E456.4.Summary of Test Method4.1 The energy utilized in this test method is delivered by asingle swing of a calibrated pendulum of a standardizedtension-impact machine.The energy to fracture a specimen,byshock in tension,is determined by the kinetic energy extractedfrom the pendulum of the impact machine in the process ofbreaking the specimen.One end of the specimen is mounted inthe pendulum.The other end of the specimen is gripped by acrosshead which travels with the pendulum until the instant ofimpact(and instant of maximum pendulum kinetic energy),when the crosshead is arrested.5.Significance and Use5.1 Tensile-impact energy is the energy required to break astandard tension-impact specimen in tension by a single swingof a standard calibrated pendulum under a set of standardconditions(see Note 2).To compensate for the minor differ-ences in cross-sectional area of the specimens,the energy tobreak is normalized to units of kilojoules per square metre(orfoot-pounds-force per square inch)of minimum cross-sectionalarea.An alternative approach to normalizing the impact energythat compensates for these minor differences and still retainsthe test unit as joules(foot-pounds)is shown in Section 10.Fora perfectly elastic material,the impact energy is usuallyreported per unit volume of material undergoing deformation.However,since much of the energy to break the plastic1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.10 on Mechanical Properties.Current edition approved Oct.1,2021.Published November 2021.Originallyapproved in 1961.Last previous edition approved in 2013 as D1822-13.DOI:10.1520/D182221.2For 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.DOI:10.1520/D1822-06.*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 the World Trade Organiz