1、Designation:D6671/D6671M22Standard Test Method forMixed Mode I-Mode II Interlaminar Fracture Toughness ofUnidirectional Fiber Reinforced Polymer Matrix Composites1This standard is issued under the fixed designation D6671/D6671M;the number immediately following the designation indicates theyear of or
2、iginal 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.1.Scope1.1 This test method covers the determination of interlami-nar fracture
3、toughness,Gc,of continuous fiber-reinforcedcomposite materials at various Mode I to Mode II loadingratios using the Mixed-Mode Bending(MMB)Test.1.2 This test method is limited to use with compositesconsisting of unidirectional carbon fiber tape laminates withbrittle and tough single-phase polymer ma
4、trices.This testmethod is further limited to the determination of fracturetoughness as it initiates from a delamination insert.Thislimited scope reflects the experience gained in round robintesting.This test method may prove useful for other types oftoughness values and for other classes of composit
5、e materials;however,certain interferences have been noted(see Section 6).This test method has been successfully used to test thetoughness of both glass fiber composites and adhesive joints.1.3 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.The
6、values stated in each system are not necessarily exact equiva-lents;therefore,to ensure conformance with the standard,eachsystem shall be used independently of the other,and valuesfrom the two systems shall not be combined.1.4 This standard does not purport to address all of thesafety concerns,if an
7、y,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
8、 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:2D883 Terminology Re
9、lating to PlasticsD2651 Guide for Preparation of Metal Surfaces forAdhesiveBondingD2734 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-er
10、ties and Equilibrium Conditioning of Polymer MatrixComposite MaterialsD5528 Test Method for Mode I Interlaminar Fracture Tough-ness of Unidirectional Fiber-Reinforced Polymer MatrixCompositesE4 Practices for Force Calibration and Verification of Test-ing MachinesE6 Terminology Relating to Methods of
11、 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 Statistics3.Terminology3.1 Terminology
12、 D3878 defines terms relating to high-modulus fibers and their composites.Terminology D883 de-fines terms relating to plastics.Terminology E6 defines termsrelating to mechanical testing.Terminology E456 and PracticeE177 define terms relating to statistics.In the event of conflictbetween terms,Termin
13、ology D3878 shall have precedenceover the other terminology standards.NOTE1If the term represents a physical quantity,its analyticaldimensions are stated immediately following the term(or letter symbol)infundamental dimension form,using the following ASTM standard sym-bology for fundamental dimensio
14、ns,shown within square brackets:Mfor mass,L for length,T for time,u for thermodynamic temperature,1This 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 Feb.1,2
15、022.Published March 2022.Originallyapproved in 2001.Last previous edition approved in 2019 as D6671/D6671M 19.DOI:10.1520/D6671_D6671M-22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume info
16、rmation,refer to the standards Document Summary page onthe ASTM website.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.1and n
