ASTM_D_6110_-_18.pdf

Designation:D611018Standard Test Method forDetermining the Charpy Impact Resistance of NotchedSpecimens of Plastics1This standard is issued under the fixed designation D6110;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 is used to determine the resistance ofplastics to breakage by flexural shock as indicated by theenergy extracted from standardized(see Note 1)pendulum-type hammers,mounted in standardized machines,in breakingstandard specimens with one pendulum swing.This testmethod requires specimens to be made with a milled notch(seeNote 2).The notch produces a stress concentration whichpromotes a brittle,rather than a ductile,fracture.The results ofthis test method are reported in terms of energy absorbed perunit of specimen width(see Note 3).NOTE1The machines with pendulum-type hammers have beenstandardized in that they must comply with certain requirements includinga fixed height of hammer fall,which results in a substantially fixedvelocity of the hammer at the moment of impact.Hammers of differentinitial energies(produced by varying their effective weights),however,arerecommended for use with specimens of different impact resistance.Moreover,manufacturers of the equipment are permitted to use differentlengths and constructions of pendulums with possible differences inpendulum rigidities resulting(see Section 5).Be aware that otherdifferences in machine design do exist.NOTE2The specimens are standardized in that they have a fixedlength and fixed depth,however,the width of the specimens is permittedto vary between limits.One design of milled notch is allowed.The notchin the specimen serves to concentrate the stress,minimize plasticdeformation,and direct the fracture to the part of the specimen behind thenotch.Scatter in energy-to-break is thus reduced.Because of differencesin the elastic and viscoelastic properties of plastics,however,response toa given notch varies among materials.NOTE3Caution must be exercised in interpreting the results of thistest method.The following testing parameters have been shown to affecttest results significantly:method of specimen fabrication,including butnot limited to processing technology,molding conditions,mold design,and thermal treatment;method of notching;speed of notching tool;designof notching apparatus;quality of the notch;time between notching andtest;test specimen thickness;test specimen width under notch;andenvironmental conditioning.1.2 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.NOTE4This standard resembles ISO 179 in title only.The content issignificantly different.1.3 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:2D618 Practice for Conditioning Plastics for TestingD647 Practice for Design of Molds for Test Specimens ofPlastic Molding Materials(Withdrawn 1994)3D883 Terminology Relating to PlasticsD4000 Classification System for Specifying Plastic Materi-alsD4066 Classification System for Nylon Injection and Extru-sion Materials(PA)D5947 Test Methods for Physical Dimensions of SolidPlastics SpecimensE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 DefinitionsFor definitions related to plastics,see Ter-minology D883.4.Summary of Test Method4.1 A notched specimen is supported as a horizontal simplebeam and is broken by a single swing of the pendulum with theimpact line midway between the supports and directly oppositethe notch.1This 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 April 1,2018.Published April 2018.Originallyapproved in 1997.Last previous edition approved in 2017 as D6110-17.DOI:10.1520/D6110-18.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West C