ASTM_D_7905_-_D_7905M_-_19e1.pdf

Designation:D7905/D7905M191Standard Test Method forDetermination of the Mode II Interlaminar FractureToughness of Unidirectional Fiber-Reinforced PolymerMatrix Composites1This standard is issued under the fixed designation D7905/D7905M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEEditorial changes were made to Table 1 in November 2019.1.Scope1.1 This test method covers the determination of the mode IIinterlaminar fracture toughness,GIIc,of unidirectional fiber-reinforced polymer matrix composite laminates under mode IIshear loading using the end-notched flexure(ENF)test(Fig.1).1.2 This method is limited to use with composites consistingof unidirectional carbon-fiber-and glass-fiber-reinforced lami-nates.This limited scope reflects the experience gained inround robin testing.This test method may prove useful forother types and classes of composite materials;however,certain interferences have been noted(see Section 6).1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not necessarily exact equivalents;therefore,toensure conformance with the standard,each system shall beused independently of the other,and values from the twosystems shall not be combined.1.3.1 Within the text the inch-pound units are shown inbrackets.1.4 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.1.5 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:2D792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD883 Terminology Relating to PlasticsD2584 Test Method for Ignition Loss of Cured ReinforcedResinsD2734 Test Methods for Void Content of Reinforced PlasticsD3171 Test Methods for Constituent Content of CompositeMaterialsD3878 Terminology for Composite MaterialsD5229/D5229M Test Method for MoistureAbsorption Prop-erties and Equilibrium Conditioning of Polymer MatrixComposite MaterialsD5687/D5687M Guide for Preparation of Flat CompositePanels with Processing Guidelines for Specimen Prepara-tionD7264/D7264M Test Method for Flexural Properties ofPolymer Matrix Composite MaterialsE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or ProcessE177 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 MethodE1309 GuideforIdentificationofFiber-ReinforcedPolymer-Matrix Composite Materials in Databases(With-drawn 2015)31This test method is under the jurisdiction of ASTM Committee D30 onComposite Materials and is the direct responsibility of Subcommittee D30.06 onInterlaminar Properties.Current edition approved March 15,2019.Published June 2019.Originallyapproved in 2014.Last previous edition approved in 2014 as D7905/D7905M 14.DOI:10.1520/D7905_D7905M-19E01.2For 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.Copyright 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 Organization Technical Barriers to Trade(TBT)Committee.1 E1434 Guide for Recording Mechanical Test Data of Fiber-Reinforced Composite Materials in Databases(Withdrawn2015)3E1471 Guide for Identification of Fibers,Fillers,and CoreMaterials in Computerized Material Property Databases(Withdrawn 2015)33.Terminology3.1 Terminology D3878 defines terms relating to high-modulous fibers and their composites.Terminology D883defines terms relating to plastics.Terminology E6 defines termsrelating